Ecology of Blue Straggler Stars PDF Download
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Author: Henri M. J. Boffin
Publisher: Springer
ISBN: 3662444348
Category : Science
Languages : en
Pages : 364
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Book Description
The existence of blue straggler stars, which appear younger, hotter, and more massive than their siblings, is at odds with a simple picture of stellar evolution. Such stars should have exhausted their nuclear fuel and evolved long ago to become cooling white dwarfs. They are found to exist in globular clusters, open clusters, dwarf spheroidal galaxies of the Local Group, OB associations and as field stars. This book summarises the many advances in observational and theoretical work dedicated to blue straggler stars. Carefully edited extended contributions by well-known experts in the field cover all the relevant aspects of blue straggler stars research: Observations of blue straggler stars in their various environments; Binary stars and formation channels; Dynamics of globular clusters; Interpretation of observational data and comparison with models. The book also offers an introductory chapter on stellar evolution written by the editors of the book.
Author: Henri M. J. Boffin
Publisher: Springer
ISBN: 3662444348
Category : Science
Languages : en
Pages : 364
Get Book Here
Book Description
The existence of blue straggler stars, which appear younger, hotter, and more massive than their siblings, is at odds with a simple picture of stellar evolution. Such stars should have exhausted their nuclear fuel and evolved long ago to become cooling white dwarfs. They are found to exist in globular clusters, open clusters, dwarf spheroidal galaxies of the Local Group, OB associations and as field stars. This book summarises the many advances in observational and theoretical work dedicated to blue straggler stars. Carefully edited extended contributions by well-known experts in the field cover all the relevant aspects of blue straggler stars research: Observations of blue straggler stars in their various environments; Binary stars and formation channels; Dynamics of globular clusters; Interpretation of observational data and comparison with models. The book also offers an introductory chapter on stellar evolution written by the editors of the book.
Author: Elena Sabbi
Publisher:
ISBN:
Category :
Languages : en
Pages : 182
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Book Description
Author: Giacomo Beccari
Publisher: Cambridge University Press
ISBN: 1108428584
Category : Science
Languages : en
Pages : 359
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Book Description
An advanced review of how binary stars affect stellar evolution, presenting results from state-of-the art models and recent observations.
Author: Giacomo Beccari
Publisher: Cambridge University Press
ISBN: 1108681948
Category : Science
Languages : en
Pages : 359
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Book Description
Stars are mostly found in binary and multiple systems, with at least 50% of all solar-like stars having companions; this fraction approaches 100% for the most massive stars. A large proportion of these systems interact and alter the structure and evolution of their components, leading to exotic objects such as Algol variables, blue stragglers and other chemically peculiar stars, but also to phenomena such as non-spherical planetary nebulae, supernovae and gamma-ray bursts. While it is understood that binaries play a critical role in the Initial Mass Function, the interactions among binary systems significantly affect the dynamical evolution of stellar clusters and galaxies. This interdisciplinary volume presents results from state-of-the-art models and observations aimed at studying the impact of binaries on stellar evolution in resolved and unresolved populations. Serving as a bridge between observational and theoretical astronomy, it is a comprehensive review for researchers and advanced students of astrophysics.
Author: Emily M. Leiner
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Color-magnitude diagrams (CMDs) of open clusters reveal many stars that do not fall on standard isochrones, and thus are not evolving according to standard theory. The most numerous of these are the blue straggler stars (BSSs), stars brighter and bluer than the cluster turnoff that are likely formed from binary mass transfer, stellar mergers, or collisions during dynamical encounters. Many other non-standard stars are also found in clusters, but their origins are not well understood. These include the 'yellow stragglers' found between the BSS region and the red giant branch, and 'sub-subgiants' found fainter and redder than the giant branch. Using the 4 Gyr open cluster M67 as an exemplar, I present results of the first comprehensive study to move beyond the BSS population and begin to understand these other types of non-standard stars. First, I present an asteroseismic analysis of a yellow straggler in M67, demonstrating that it is an evolved blue straggler star of twice the cluster turnoff mass. Next, I present theoretical formation models for the sub-subgiant stars. I focus on three hypotheses of sub-subgiant formation: Roche lobe overflow in binary systems, rapid envelope mass loss from subgiant stars, e.g. during grazing dynamical encounters, and inhibition of convection in giant stars with strong magnetic fields. Finally, I use K2 light curves to identify stars on the M67 main sequence with unusually fast rotation rates given the old age of the cluster. I hypothesize that these stars have been spun up due to recent mergers, collisions, or episodes of mass-transfer, and thus represent lower-luminosity analogs to the blue stragglers. Together, these studies present a much more complete view of the post-merger, collision, and mass-transfer population of M67, and demonstrate that BSSs account for only about half of the post-interaction population. These stars represent the early stages of binary evolution pathways that may lead to many astrophysically important objects including X-ray binaries, double degenerates, and Type 1a supernovae. Studying these products of binary evolution across cluster CMDs is a critical step towards developing better models of binary evolutionary pathways and understanding the impact of binaries on stellar populations.
Author: David F. Gray
Publisher: Cambridge University Press
ISBN: 1009085417
Category : Science
Languages : en
Pages : 536
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Book Description
This textbook describes the equipment, observational techniques, and analysis used in the investigation of stellar photospheres. Now in its fourth edition, the text has been thoroughly updated and revised to be more accessible to students. New figures have been added to illustrate key concepts, while diagrams have been redrawn and refreshed throughout. The book starts by developing the tools of analysis, and then demonstrates how they can be applied. Topics covered include radiation transfer, models of stellar photospheres, spectroscopic equipment, how to observe stellar spectra, and techniques for measuring stellar temperatures, radii, surface gravities, chemical composition, velocity fields, and rotation rates. Up-to-date results for real stars are included. Written for starting graduate students or advanced undergraduates, this textbook also includes a wealth of reference material useful to researchers. eBook formats include color imagery while print formats are greyscale only; a wide selection of the color images are available online.
Author: Henri M. J. Boffin
Publisher: Springer Nature
ISBN: 3030250598
Category : Science
Languages : en
Pages : 113
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Book Description
It is now clear that a binary evolutionary pathway is responsible for a significant fraction of all planetary nebulae, with some authors even going so far as to claim that binarity may be a near requirement for the formation of an observable nebula. This has led to the requirement that textbooks most likely need to be rewritten. Building upon the review of Jones and Boffin in Nature Astronomy (2017), this Springer Brief takes a first step in this direction. It offers the first expanded presentation of all the theoretical and observational support for the importance of binarity in the formation of planetary nebulae, initially focusing on common envelope evolution but also covering wider binaries. This book emphasises the wider impact of the field, highlighting the critical role binary central stars of planetary nebulae have in understanding a plethora of astrophysical phenomena, including type Ia supernovae, chemically peculiar stars and circumbinary exoplanets.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Membership studies of evolved open clusters reveal many alternative pathway stellar products whose evolution cannot be explained using single-star evolutionary models. These stars are neither rare nor anomalous, and in fact are a common occurrence in cluster populations. The goal of this thesis is to investigate the origin and evolutionary pathways of such stars through the careful study of X-ray binaries in NGC 6819 and white dwarf (WD) companions of mass transfer-formed blue straggler stars (BSSs) in NGC 188. I present the first X-ray study of the intermediate-age open cluster NGC 6819, using observations from XMM-Newton. This study of NGC 6819 is part of a systematic survey to investigate the relationship between the number of X-ray sources and cluster dynamics in the regime of massive open clusters. Of the 12 X-ray sources within the half-light radius of NGC 6819, four sources challenge single-star evolutionary models, including a candidate quiescent low-mass X-ray binary. Next, I present the first results from a Hubble Space Telescope (HST) far-ultraviolet (FUV) campaign to search for WD companions of BSSs as indicators of mass transfer formation. I find direct observational detections of young (
Author: Ernst Paunzen
Publisher: Cuvillier Verlag
ISBN: 3736962835
Category : Science
Languages : en
Pages : 248
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Book Description
This book describes the characteristics and applications of the Δa photometric system, which measures the stellar flux at around 520 nm. Since its introduction in 1976 by Hans-Michael Maitzen, the Δa system has not only been successfully applied to the classical chemically peculiar stars of the upper main sequence, but also to galactic and extragalactic star clusters. New possible applications for studying galaxies, quasars and other astrophysical objects of interest are discussed.
Author: Walter Lewin
Publisher: Cambridge University Press
ISBN: 1139451774
Category : Science
Languages : en
Pages : 667
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Book Description
X-ray astronomy is the prime available window on astrophysical compact objects: black holes, neutron stars and white dwarfs. In this book, prominent experts provide a comprehensive overview of the observations and astrophysics of these objects. This is a valuable reference for graduate students and active researchers.
