Asteroseismology

This book – the first on asteroseismology – offers a practical guide for graduate students and scientists working in stellar astrophysics.

Asteroseismology

Understanding the stars is the bedrock of modern astrophysics. Stars are the source of life. The chemical enrichment of our Milky Way and of the Universe withallelementsheavierthanlithiumoriginatesintheinteriorsofstars.Stars arethe tracersofthe dynamics ofthe Universe,gravitationallyimplying much more than meets the eye. Stars ionize the interstellar medium and re-ionized the early intergalactic medium. Understanding stellar structure and evolution is fundamental. While stellar structure and evolution are understood in general terms, we lack important physical ingredients, despite extensive research during recent decades.Classicalspectroscopy,photometry,astrometryandinterferometryof stars have traditionally been used as observational constraints to deduce the internal stellar physics. Unfortunately, these types of observations only allow the tuning of the basic common physics laws under stellar conditions with relatively poor precision. The situation is even more worrisome for unknown aspects of the physics and dynamics in stars. These are usually dealt with by using parameterised descriptions of, e.g., the treatments of convection, rotation,angularmomentumtransport,theequationofstate,atomicdi?usion andsettlingofelements,magneto-hydrodynamicalprocesses,andmore.There is a dearth of observational constraints on these processes, thus solar values areoftenassignedtothem.Yetitishardtoimaginethatonesetofparameters is appropriate for the vast range of stars.

Asteroseismology

This book – the first on asteroseismology – offers a practical guide for graduate students and scientists working in stellar astrophysics.

Asteroseismology

This volume offers a practical guide to asteroseismology for graduate students and scientists involved with stellar astrophysics. It introduces asteroseismology and provides comprehensive coverage of fundamental theory, observations and techniques, in addition data analysis methods.

Advances in Helio and Asteroseismology

Proceedings of the 123rd Symposium of the International Astromonomical Union, held in Aarhus, Denmark, July 7-11, 1986.

Advances in Helio  and Asteroseismology

Proceedings of the 123rd Symposium of the International Astromonomical Union, held in Aarhus, Denmark, July 7-11, 1986.

Methods in Helio and Asteroseismology

Currently the foremost instruments used for spectroscopic asteroseismology are
the UCLES instrument on the Anglo - Australian Telescope , HIRES at the Keck
telescope , and the HARPS instrument at ESO . It should be mentioned that in ...

Methods in Helio  and Asteroseismology

This book discusses the methods used in helio- and asteroseismology for the collection, analysis and interpretation of data. It is the first comprehensive discussion of helioseismic and asteroseismic methodology, collecting techniques from over 300 research papers spread out over decades, with a critical discussion and inter-comparison. It enables the reader to follow the path of inference from the collection of the data at the telescope through to the understanding gained in terms of the modeling of solar and stellar physics and stellar evolution.By focusing on how results are obtained, rather than on the results themselves, this book provides the essential background needed to understand this field, which is rapidly advancing due to the availability of modern observing facilities both on the ground and in space. The material is accessible for advanced undergraduates and post-graduates, and provides an essential resource for researchers in the field.

Asteroseismology

This volume provides a wide-ranging and up-to-date overview of the theoretical, experimental and analytical tools for carrying out front-line research in stellar physics using asteroseismological observations, tools and inferences.

Asteroseismology

Our understanding of stars has grown significantly due to recent advances in asteroseismology, the stellar analog of helioseismology, the study of the Sun's acoustic wave oscillations. Using ground-based and satellite observatories to measure the frequency spectra of starlight, researchers are able to probe beneath a star's surface and map its interior structure. This volume provides a wide-ranging and up-to-date overview of the theoretical, experimental and analytical tools for carrying out front-line research in stellar physics using asteroseismological observations, tools and inferences. Chapters from seven eminent scientists in residence at the twenty-second Canary Islands Winter School of Astrophysics examine the interior of our Sun relative to data collected from distant stars, how to measure the fundamental parameters of single field stars, diffusion processes, and the effects of rotation on stellar structures. The volume also provides detailed treatments of modeling and computing programs, providing astronomers and graduate students a practical, methods-based guide.

New Eyes to See Inside the Sun and Stars

NEW DEVELOPMENTS IN ASTEROSEISMOLOGY D. W. KURTZ Department of
Astronomy , University of Cape Town , Rondebosch 7701 , South Africa 1 .
Introduction The day before the start of IAU Symposium 185 Wojtek Dziembowski
and I ...

New Eyes to See Inside the Sun and Stars

The cover picture of this volume displays one of the most advanced products of he lioseismic research: a view into the deep interior of the sun, revealing its distinctly non-uniform rotation throughout the entire depth of the convection zone. Just over 20 years ago, the first successful helioseismic experiment disclosed an increase of ro tation velocity in the uppermost one dozen megameters below the photosphere. The stunning progress in depth and detail highlighted by the cover diagram (and by others shown in this volume as well) was made possible by considerable advances in instru mentation, by the development of powerful analytical tools and, foremost, by the involvement of new brains of enthusiastic proselytes and newcomers to the field, in creasing nearly exponentially in number every year. New branches of research widened the scope of "uranoseismology", as e. g. time-distance seismology (the promising av enue towards small-scale and short-time variability), atmospheric seismology (a new look at strange phenomena we have all ways seen, but hardly understood), and finally the growing observational assault on hundreds of individual stars which are either manifestly or supposedly oscillating -i. e. asteroseismology. The formation of numer ous solar and stellar observing networks and, ultimately, space missions like SOHO have greatly promoted the potential of this science. This steady progress was accompanied by workshops, colloquia, and symposia in quick succession.

Asteroseismology of Stellar Populations in the Milky Way

This book represents a natural progression from the collection of review papers presented in the book 'Red Giants as Probes of the Structure and Evolution of the Milky Way', which appeared in the Astrophysics and Space Science Proceedings ...

Asteroseismology of Stellar Populations in the Milky Way

The detection of radial and non-radial solar-like oscillations in thousands of G-K giants with CoRoT and Kepler is paving the road for detailed studies of stellar populations in the Galaxy. The available average seismic constraints allow largely model-independent determination of stellar radii and masses, and can be used to determine the position and age of thousands of stars in different regions of the Milky Way, and of giants belonging to open clusters. Such a close connection between stellar evolution, Galactic evolution, and asteroseismology opens a new very promising gate in our understanding of stars and galaxies. This book represents a natural progression from the collection of review papers presented in the book 'Red Giants as Probes of the Structure and Evolution of the Milky Way', which appeared in the Astrophysics and Space Science Proceedings series in 2012. This sequel volume contains review papers on spectroscopy, seismology of red giants, open questions in Galactic astrophysics, and discusses first results achieved by combining photometric/spectroscopic and seismic constraints on populations of stars observed by CoRoT and Kepler. The book also reports on discussions between expert researchers in Galactic evolution, specialists in stellar structure and asteroseismology, and key representatives of extensive ground-based spectroscopic surveys such as APOGEE and the ESO-GAIA Spectroscopic Survey, which would serve as a roadmap for future endeavours in this field of research.

Asteroseismology Across the HR Diagram

For good reason it was decided to entitle our conference 'Asteroseismology Across the HR Diagram' . Yet the challenges still to be faced to make asteroseismology across the HR diagram a reality are formidable.

Asteroseismology Across the HR Diagram

We stand at the threshold of an exciting era of Asteroseismology. In a few months' time, the Canadian small-satellite asteroseismology mission MOST will be laun ched. Danish and French missions MONS and COROT should follow, with the ESA mission Eddington following in 2007/8. Helioseismology has proved spec tacularly successful in imaging the internal structure and dynamics of the Sun and probing the physics of the solar interior. Ground-based observations have detected solar-like oscillations on alpha Centauri A and other Sun-like stars, and diagnostics similar to those used in helioseismology are now being used to test and constrain the physics and evolutionary state of these stars. Multi-mode oscillations are being observed in an abundance of other stars, including slowly pulsating B stars (SPB stars), delta Scuti stars, Ap stars and the pulsating white dwarfs. New classes of pulsators continue to be discovered across the Hertzsprung-Russell diagram. For good reason it was decided to entitle our conference 'Asteroseismology Across the HR Diagram' . Yet the challenges still to be faced to make asteroseismology across the HR diagram a reality are formidable. Observation, data analysis and theory all pose hard problems to be overcome. In conceiving this meeting, the aim of the organisers was to facilitate a cross-fertilization of ideas and approaches between researchers working on different pulsators and with different areas of expertise. We venture to suggest that in this the conference was a great success.

Helioseismology Asteroseismology and MHD Connections

The Current Status of Asteroseismology C. Aerts · J. Christensen-Dalsgaard · M.
Cunha · D.W. Kurtz Originally published in the journal Solar Physics, Volume 251
, Nos 1–2, 3–20. DOI: 10.1007/s11207-008-9182-z © Springer ...

Helioseismology  Asteroseismology  and MHD Connections

This collection of papers offers a timely snapshot of helio- and asteroseismology in the era when SOHO/MDI instrument is about to be replaced by SDO/HMI and when the CoRoT space mission is yielding its first long-duration light curves of thousands of stars.

Asteroseismology and Exoplanets Listening to the Stars and Searching for New Worlds

This book presents the proceedings of the IVth Azores International Advanced School in Space Sciences entitled "Asteroseismology and Exoplanets: Listening to the Stars and Searching for New Worlds".

Asteroseismology and Exoplanets  Listening to the Stars and Searching for New Worlds

This book presents the proceedings of the IVth Azores International Advanced School in Space Sciences entitled "Asteroseismology and Exoplanets: Listening to the Stars and Searching for New Worlds". The school addressed the topics at the forefront of scientific research being conducted in the fields of asteroseismology and exoplanetary science, two fields of modern astrophysics that share many synergies and resources. These proceedings comprise the contributions from 18 invited lecturers, including both monographic presentations and a number of hands-on tutorials.

Asteroseismology Across the HR Diagram

Asteroseismology presents greater challenges and opportunities. When used in
conjunction with other astrophysical tools, it will provide unique probes of the
extent and structure of convective regions in stellar interiors, and stringent new
tests ...

Asteroseismology Across the HR Diagram

This book aims to facilitate a cross-fertilisation of ideas and approaches between fields covering different pulsators and with different areas of expertise. The book successfully covers most known types of pulsators, reflecting a highly productive and far reaching interchange of ideas which we believe is conveyed by the papers and posters published, making it a reference for researchers and postgraduate students working on stellar structure and evolution.

Asteroseismology

This is not used so much, and I have never seen it in the field of
asteroseismology. On the other hand, truncated Julian date is widely used, but
not everyone means the same thing. r TJD: Truncated Julian date (TJD) means
different things to ...

Asteroseismology

Provides an up-to-date overview of the theoretical, experimental and analytical tools for carrying out asteroseismological observations and inferences.

Differential Rotation in Sun like Stars from Surface Variability and Asteroseismology

In his PhD dissertation Martin Bo Nielsen performs observational studies of rotation in stars like the Sun.

Differential Rotation in Sun like Stars from Surface Variability and Asteroseismology

In his PhD dissertation Martin Bo Nielsen performs observational studies of rotation in stars like the Sun. The interior rotation in stars is thought to be one of the driving mechanisms of stellar magnetic activity, but until now this mechanism was unconstrained by observational data. NASA’s Kepler space mission provides high-precision observations of Sun-like stars which allow rotation to be inferred using two independent methods: asteroseismology measures the rotation of the stellar interior, while the brightness variability caused by features on the stellar surface trace the rotation of its outermost layers. By combining these two techniques Martin Bo Nielsen was able to place upper limits on the variation of rotation with depth in five Sun-like stars. These results suggest that the interior of other Sun-like stars also rotate in much the same way as our own Sun.

Variability of the Sun and Sun like Stars from Asteroseismology to Space Weather

This book is based on contributions presented at the first International Conference on Solar Physics which was organized in Baku, Azerbaijan in July 06–08, 2015, by the Science Development Foundation under the President of the Republic of ...

Variability of the Sun and Sun like Stars  from Asteroseismology to Space Weather

This book is based on contributions presented at the first International Conference on Solar Physics which was organized in Baku, Azerbaijan in July 06–08, 2015, by the Science Development Foundation under the President of the Republic of Azerbaijan. The primary goals were to highlight specific aspects of modern solar physics research, including observation and theory that span from the interior of the Sun out into the wider heliosphere, as well as solar-terrestrial physics and particularly, sun-like stars. The Sun is a variable star. However, we are still far from fully understanding what and how causes this variability. Why does the Sun continue to go on, on a rhythmic scale, the so-called solar cycle, without damping? How to better understand the complicated relationships between the Sun, the heliosphere and the many proxies of long-term solar activity? How the data could be fully exploited for a better understanding of solar changes on the longest possible time scales? How our knowledge on the Sun can be transfer to other stars? What are the impacts on our terrestrial environment? These questions shape the architecture of the book. It will be of interest and useful to scientists and graduate level readers who would like to better master such up-to-date topics.

Methods in Helio and Asteroseismology

This book discusses the methods used in helio- and asteroseismology for the collection, analysis and interpretation of data.

Methods in Helio  and Asteroseismology

This book discusses the methods used in helio- and asteroseismology for the collection, analysis and interpretation of data. It is the first comprehensive discussion of helioseismic and asteroseismic methodology, collecting techniques from over 300 research papers spread out over decades, with a critical discussion and inter-comparison. It enables the reader to follow the path of inference from the collection of the data at the telescope through to the understanding gained in terms of the modeling of solar and stellar physics and stellar evolution. By focusing on how results are obtained, rather than on the results themselves, this book provides the essential background needed to understand this field, which is rapidly advancing due to the availability of modern observing facilities both on the ground and in space. The material is accessible for advanced undergraduates and post-graduates, and provides an essential resource for researchers in the field. Contents:Global Helioseismology: The DataGlobal Helioseismology: ModelingGlobal Helioseismology: Inverse MethodsLocal HelioseismologyAsteroseismologyAppendices:Useful Vector FormulasExplicit Forms of Vector OperationsUseful Constants Readership: Academic and professional solar and stellar physicists, researchers using remote sensing seismic sounding, and other non-destructive sensing methods; also suitable for advanced undergraduates and post-graduates. Keywords:Helioseismology;Asteroseismology;Stellar Evolution;Time Series Analysis;Inverse Methods;Remote SensingKey Features:A unique discussion of data collection and analysis, as well as the underlying theoryDiscusses in detail the step linking these two: inverse methods and the crucial role of error analysisTreats both global and local helioseismology and asteroseismology, facilitating synergies between these fieldsReviews:“This is a very good and very well written book … it provides the essential background needed to understand this field, which is rapidly advancing due to the availability of modern observing facilities both on the round and in space. The material is accessible for advanced undergraduates and postgraduates, and provides an essential resource for researchers in the field.”Mathematical Reviews

Asteroseismology of Stellar Populations in the Milky Way

This book represents a natural progression from the collection of review papers presented in the book 'Red Giants as Probes of the Structure and Evolution of the Milky Way', which appeared in the Astrophysics and Space Science Proceedings ...

Asteroseismology of Stellar Populations in the Milky Way


Asteroseismology of Red Giants

In this work we present our 4-year radical velocity observing program to provide accurate dynamical masses for 16 red giants in eclipsing binary systems.

Asteroseismology of Red Giants

Asteroseismology is an invaluable tool that allows one to peer into a star and know its fundamental stellar properties with relative ease. There has been much exploration of solar-like oscillations within red giants with recent advances in technology, leading to new innovations in observing. The Kepler mission, with its 4-year observations of a single patch of sky, has opened the floodgates on asteroseismic studies. Binary star systems are also an invaluable resource for their ability to provide independent constraints on fundamental stellar parameters such as mass and radius. The asteroseismic scaling laws link observables in the light curves of stars to the physical parameters in the stars, providing a unique method to study large populations of stars quite easily. In this work we present our 4-year radical velocity observing program to provide accurate dynamical masses for 16 red giants in eclipsing binary systems. From this we find that asteroseismology overestimates the mass and radius of red giants by 15% and 5% respectively. We further attempt to model the pulsations of a few of these stars using stellar evolution and oscillation codes. The goal is to determine which masses are correct and if there is a physical cause for the discrepancy in asteroseismic masses. We find there are many challenges to modeling evolved stars such as red giants and we address a few of the major concerns. These systems are some of the best studied systems to date and further exploration of their asteroseismic mysteries is inevitable.

Communications in Asteroseismology

The publication series Communications in Asteroseismology (CoAst) is one of the most important international journals in the field of asteroseismology.

Communications in Asteroseismology

The publication series Communications in Asteroseismology (CoAst) is one of the most important international journals in the field of asteroseismology. Asteroseismology is the science of variable and pulsating stars. Every six months CoAst publishes a newsletter with papers on ongoing research projects. Besides these regular issues, special issues such as conference proceedings or program manuals are published in this series. Volume 156 contains publications on a wide variety of pulsating stars at diverse evolutionary stages that have been analysed on the basis of photometrical or numerical techniques. These include a paper on the first detections of the CoRoT satellite, which started to operate almost one year ago. The last article in this issue contains a report of the European Helio- and Asteroseismology Network (HELAS) where activities and future plans concerning the european asteroseismology are presented.

Communications in Asteroseismology Volume 155 October 2008

This volume is the printed version of the two manuals and is funded by the EU.

Communications in Asteroseismology  Volume 155  October 2008

The publication series of Communications in Asteroseismology (CoAst) is one of the most important international journals in the field of asteroseismology. Asteroseismology is the science concerned with stellar pulsation. Every six months, CoAst publishes a newsletter with papers about the latest results and ongoing research projects. Besides these regular issues, special issues such as conference proceedings or software manuals are published in this series. CoAst volume 155 contains two manuals of software tools dedicated to asteroseismology: the web interface DAS (Database AsteroSeismology) and the software package FAMIAS (Frequency Analysis and Mode Identification for Asteroseismology). Both tools have been developed in the framework of European Helio- and Asteroseismology Network (HELAS), which was founded and is funded by the EU. The aim of the FAMIAS / DAS packages is to enable user-friendly access to state of the art methods for asteroseismology. Successful asteroseismology of stars on the main sequence hotter than the sun is highly dependent on the knowledge of the surface structure of pulsational modes, by means of mode identification. Mode identification can be derived from modeling the luminosity variations of the star in several photometric filters and intensity variations in the profile of absorption lines. FAMIAS is a sophisticated tool for the analysis of spectroscopic and photometric time series to find pulsational modes and the corresponding pulsational quantum numbers: the degree l and the azimutal order m. The database DAS contains a well documented library of light curves and spectroscopic time series data of selected pulsating stars. Together with FAMIAS, it provides a complete package of tools for mode identification to researchers as well as to students, working on the field of asteroseismology. This volume is the printed version of the two manuals and is funded by the EU.