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Author: Publisher: ISBN: Category : Languages : en Pages : 149
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: Publisher: ISBN: Category : Languages : en Pages : 149
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: Giacomo Beccari Publisher: Cambridge University Press ISBN: 1108681948 Category : Science Languages : en Pages : 359
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: D.Q. Lamb Publisher: Springer Science & Business Media ISBN: 9400953194 Category : Science Languages : en Pages : 435
Book Description
Since 1976 a meeting devoted to recent research on cataclysmic variables ("CV workshop") has been held annually somewhere in North America. Many of the meetings have been held - following a custom older than anyone reading this book - in locations with well-known recreational potential (e. g. Santa Cruz, CA; Boulder, CO). We thought hard about this custom while contemplating the possibility of organi zing a meeting in Massachusetts in the middle of winter. Nobody wants their meeting to go down in history as the smallest and dullest, and it ~ surely be the coldest. But on occasion, meeting organizers have defied custom and scheduled meetings for less~than-trendy places, and gotten away with it (Ur·bana, IL and Rochester, NY must be reckoned as examples of this). Encouraged by the spatial and temporal proximity of the American Astronomical Society meeting (Boston, January 9-12), we thought we might get away with it again, and so came to organize a meeting for January 12-15, 1983, in Cambridge, MA. There was another reason for a meeting at this time and place, we loftily proclaimed in early mailings. No one doubts that the CV's are closely related to the low-mass X-ray binaries ("LMXB' s"), in which the accreting star is usually, or perhaps always, more compact than a white dwarf. Many of the general characteristics of LMXB's sound pretty familiar to any student of CV's: orbital periods in the range 0.
Author: Emily M. Leiner Publisher: ISBN: Category : Languages : en Pages : 0
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: Henri M. J. Boffin Publisher: Springer ISBN: 3662444348 Category : Science Languages : en Pages : 364
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: Dany Vanbeveren Publisher: Springer Science & Business Media ISBN: 9780792371045 Category : Science Languages : en Pages : 612
Book Description
This book reviews recent observations of non-evolved and evolved binary populations in clusters and the field with special emphasis on statistical biases, incompleteness, and distribution functions. It considers different binary types and presents and discusses recent results in the field.
Author: Thomas M Tauris Publisher: Princeton University Press ISBN: 0691239266 Category : Science Languages : en Pages : 865
Book Description
A graduate-level textbook on the astrophysics of binary star systems and their evolution Physics of Binary Star Evolution is an up-to-date textbook on the astrophysics and evolution of binary star systems. Theoretical astrophysicists Thomas Tauris and Edward van den Heuvel cover a wide range of phenomena and processes, including mass transfer and ejection, common envelopes, novae and supernovae, X-ray binaries, millisecond radio pulsars, and gravitational wave (GW) sources, and their links to stellar evolution. The authors walk through the observed properties and evolution of different types of binaries, with special emphasis on those containing compact objects (neutron stars, black holes, and white dwarfs). Attention is given to the formation mechanisms of GW sources—merging double neutron stars and black holes as well as ultra-compact GW binaries hosting white dwarfs—and to the progenitors of these sources and how they are observed with radio telescopes, X-ray satellites, and GW detectors (LIGO, Virgo, KAGRA, Einstein Telescope, Cosmic Explorer, and LISA). Supported by illustrations, equations, and exercises, Physics of Binary Star Evolution combines theory and observations to guide readers through the wonders of a field that will play a central role in modern astrophysics for decades to come. 465 equations, 47 tables, and 350+ figures More than 80 exercises (analytical, numerical, and computational) Over 2,500 extensive, up-to-date references
Author: E.P. van den Heuvel Publisher: Springer Science & Business Media ISBN: 9401127042 Category : Science Languages : en Pages : 545
Book Description
Proceedings of the NATO Advanced Research Workshop on X-Ray Binaries and the Formation of Binary and Millisecond Radio Pulsars, Santa Barbara, CA, U.S.A., Januari 21-25, 1991
Author: 
Author: 
Author: Giacomo Beccari
Author: D.Q. Lamb
Author: Emily M. Leiner
Author: Aaron Matthew Geller
Author: E. F. Milone
Author: Henri M. J. Boffin
Author: Dany Vanbeveren
Author: Thomas M Tauris
Author: E.P. van den Heuvel