Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)

Details Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988) Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ycat.3137....0k&link_type=abstract

VizieR On-line Data Catalog: III/137. Originally published in: 1988SAAOC..12....1K

Mathematics

Probability

Stars: Population Ii, Stars: Subdwarf

Scientific paper

Prior to 1986 there were around 200 spectroscopically classified hot subdwarf stars. The Palomar-Green survey (Green et al., 1986ApJS...61..305G) detected over 900 hot subdwarfs, mostly in the North Galactic Cap and mostly previously unknown objects; the Kitt-Peak_Downes survey found another 60 near the Galactic Plane (Downes, 1986ApJS...61..569D). These form the basis of the present catalog but new subdwarfs are continually being found by spectroscopic surveys of photographically discovered faint blue star samples; examples are the work of Wegner and his co-workers on the Kiso survey (Wegner et al., 1985AJ.....90.1511W, 1986AJ.....91..139W, 1987AJ.....94.1271W) and of Kilkenny and Muller (1987) on southern discoveries by Luyten and collaborators (e.g. Haro and Luyten, 1962, Cat. III/74; Luyten and Anderson, 1958, 1959, 1967, "A Search for Faint Blue Stars").
Only stars for which a spectroscopic classification exists have been included. There is a significant probability that stars with only photometric classifications can be normal high-latitude B stars, white dwarfs or cataclysmic variable, for example. Hot subdwarfs in binary systems have been included but not planetary nebulae nuclei classified 'sd' since the latter have been catalogued elsewhere.
Although there is not a universally accepted classification scheme for hot subdwarfs, it is fairly clear that the main criterion is a surface gravity higher than that of hot main sequence stars but less than that of hot white dwarfs. Also, hot subdwarf stars typically show helium abundance anomalies.
(2 data files).

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