White dwarfs observed by the HIPPARCOS satellite

被引:0
作者
Vauclair, G
Schmidt, H
Koester, D
Allard, N
机构
[1] CHRISTIAN ALBRECHTS UNIV KIEL, INST ASTRON & ASTROPHYS, D-24098 KIEL, GERMANY
[2] OBSERV MIDI PYRENEES, F-31400 TOULOUSE, FRANCE
[3] OBSERV PARIS, DEPT ATOMES & MOL ASTROPHYS, F-92195 MEUDON, FRANCE
[4] CNRS, INST ASTROPHYS, F-75014 PARIS, FRANCE
关键词
stars; distances; fundamental parameters; white dwarfs;
D O I
暂无
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The HIPPARCOS satellite has measured trigonometric parallaxes for 20 white dwarfs. With the exception of one each of the spectral types DZ, DC, DB, DQ, the majority are of spectral type DA. We compare the parallaxes with the most recent ground-based determinations. From a spectroscopic analysis of new optical observations we determine atmospheric parameters T-eff and log g. From the angular diameters and the parallaxes radii are obtained, and masses are calculated from these radii and the spectroscopic log g. These data are used to test the theoretical mass-radius relation. On the other hand, assuming this relation, including finite temperature evolutionary effects, we can derive radii and masses from the effective temperatures and parallaxes. From these we calculate surface gravities, which can be compared to the results of the spectroscopic analysis.
引用
收藏
页码:1055 / 1062
页数:8
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