White Dwarfs: Cosmological and Galactic Probes

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E. Sion, S. Vennes, H. Shipman
Springer Science & Business Media, Aug 25, 2005 - Science - 268 pages
In the past few years, general astronomical interest has concentrated on s- eral objects and phenomena where white dwarf stars play a key role. T Type Ia supernovae have been used as evidence to show that, in fact, Einstein did not make his greatest blunder when heallowedfor the possibility of a c- mological constant. Improvements in our knowledge of the Hubble parameter have revived interest in the use of white dwarf stars as a different typeofc- mochronometer to measuretheage of the Galaxy andthus set constraints on the age of the Universe. In roughly the same time period, there have been considerable advances in our understanding of white dwarf stars, both as i- lated stars in the ?eld and as members ofinteracting binary systems. Much of thisadvance has come from theavailabilityof spacecraftobservations from missions like HST T T, IU UE, ROSAT T, EXOSAT T, Chandra, ORFEUS, EUVE, HUT T T, and FUSE. The discovery of thousandsof new white dwarfs from a number oflarge surveys and thepotential of theSloan Digital SkySurvey have added impetus to the ?eld. Studies ofinteracting binaries such as classical novae, supersoft X-ray bi- ries, symbiotic variables, dwarf novae and nova-like objects have revealed the diff ferences between thethermal evolution of singleand close binary systems aswell as heightenedinterest in these systems as progenitors of the cosmol- ically important Type I supernovae. A more speculative question is whether classical novae can beunderstood well enough that theymight provide another kind of standard candle.
 

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Contents

OLD ULTRACOOL WHITE DWARFS AS COSMOLOGICAL PROBES
3
THE IMPACT OF GAIA
15
INFLUENCE OF METALLICITY IN THE DETERMINATION OF THE AGE OF HALO WHITE DWARFS
25
COOL HALO WHITE DWARFS FROM GSCII
31
DARK HALO BARYONS NOT IN ANCIENT WHITE DWARFS?
41
THE WHITE DWARF POPULATION IN THE 2QZ AND SLOAN SURVEYS
49
AM Mickaelian
61
SPECTROSCOPIC AND PHOTOMETRIC OBSERVATIONS OF WHITE DWARFS IN GLOBULAR CLUSTERS
73
HOW FAR CAN WE TRUST TYPE IA SUPERNOVAE AS STANDARD CANDLES?
175
KIRSHNER ON WHITE DWARFS SUPERNOVAE AND COSMOLOGY
191
SECTION III CATACLYSMIC VARIABLES AND WHITE DWARF ACCRETION
195
ACCRETION IN CATACLYSMIC VARIABLE STARS
197
PROBES OF ACCRETION HISTORY
205
INTERMEDIATE POLARS IN LOW STATES
211
CHEMICAL ABUNDANCES OF WHITE DWARFS IN CATACLYSMIC VARIABLES
217
AM CVN STARS IN THE UCT CCD CV SURVEY
225

THE COREENVELOPE SYMMETRY IN PULSATING WHITE DWARF STARS
79
A SEARCH FOR VARIABILITY IN COOL WHITE DWARF STARS
85
STUDY OF THE GALACTIC BULGE USING NEW PLANETARY NEBULAE DISCOVERED ON THE AAOUKST Ha SURVEY
91
SECTION II TYPE IA SUPERNOVAE
95
TYPE IA SUPERNOVAE AND COSMOLOGY
97
THE PROGENITORS OF TYPE IA SUPERNOVAE
135
SURVEYS FOR DOUBLE DEGENERATE PROGENITORS OF SUPERNOVAE TYPE IA
153
POPULATION SYNTHESIS FOR PROGENITORS OF TYPE IA SUPERNOVAE
163
V2275 CYG RW UMI PX AND AND FO PER
233
THE POSSIBLE IDENTIFICATION OF TWO HIBERNATING NOVAE
243
EVIDENCE FOR LARGE SUPERHUMPS IN TX COL AND V4742 SGR
251
CONCLUDING REMARKS
261
Object Index
265
Author Index
267
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About the author (2005)

Edward M. Sion, Professor of Astronomy and Astrophysics, Villanova University, Former Scientific Editor, The Astrophysical Journal, author or co-author of over 400 scientific publications on white dwarfs and cataclysmic variable stars, co-author of the Catalogue of Spectroscopically Identified White Dwarfs.

Stephane Vennes, Research Astronomer, Johns Hopkins University, Lecturer, Australian national University, leading expert on the physics of diffusion, radiative forces, and accretion onto white dwarfs, and specialist on space ultraviolet studies of white dwarf stars.

Harry L. Shipman, Annie Jump Cannon Professor of Astronomy, University of Delaware, Distinguished Educator Medal, the National Science Foundation, author or co-author of over 300 scientific publications on white dwarfs and author of Black Holes and the Infinite Universe and Introductory Astronomy, leading expert on white dwarf stars and science education.

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