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A ROSAT SURVEY OF HOT DA WHITE-DWARFS IN NONINTERACTING BINARY-SYSTEMS

被引：57
作者：
BARSTOW, MA
HOLBERG, JB
FLEMING, TA
MARSH, MC
KOESTER, D
WONNACOTT, D
机构：
[1] UNIV ARIZONA, LUNAR & PLANETARY LAB, TUCSON, AZ 85721 USA
[2] UNIV ARIZONA, STEWARD OBSERV, TUCSON, AZ 85721 USA
[3] MAX PLANCK INST EXTRATERR PHYS, W-8046 GARCHING, GERMANY
[4] PHYS ZENTRUM, INST THEORET PHYS & STERNWARTE, KIEL, GERMANY
[5] UCL, MULLARD SPACE SCI LAB, DEPT SPACE & CLIMATE PHYS, DORKING RH5 6NT, SURREY, ENGLAND
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1994年 / 270卷 / 03期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
STARS; ATMOSPHERES; BINARIES; GENERAL; WHITE DWARFS; ULTRAVIOLET; X-RAYS;
D O I：
10.1093/mnras/270.3.199
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A number of new non-interacting binary systems comprising a white dwarf plus a normal stellar companion have been discovered by the ROSAT X-ray and EUV sky surveys. We discuss the identification of nine of these objects, determine the temperatures and gravities of the white dwarfs, and compare their atmospheric compositions with the population of isolated white dwarfs. As a result, it may be possible to estimate how many hot white dwarfs in total reside in binary systems. Coronal emission is detected in several systems, and its nature, in the light of the likely age of the binaries, is discussed. These binary systems are important representatives of several possible evolutionary paths, including common-envelope and mass-transfer phases. Their further study will be of great importance in understanding stellar evolution in general, and binaries in particular.
引用
收藏
页码：499 / 515
页数：17
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