White Dwarfs: Cosmological and Galactic Probes

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.

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
• 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
• 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
• 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

About the author

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.

Bibliographic information

• Title: White Dwarfs: Cosmological and Galactic Probes; Volume 332 of Astrophysics and Space Science Library
• Editors: E. Sion, S. Vennes, H. Shipman
• Edition: illustrated
• Publisher: Springer Science & Business Media, 2005
• ISBN: 1402036930, 9781402036934
• Length: 268 pages
• Subjects: Science / Astronomy; Science / Physics / Astrophysics