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III/137 Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)
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Beginning of ReadMe :III/137 Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)
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A Catalogue of Spectroscopically Identified Hot Subdwarf Stars
Kilkenny D., Heber U., Drilling J.S.
<S.Afr. Astron. Obs. Circ., 12, 1-80 (1988)>
=1988SAAOC..12....1K
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ADC_Keywords: Stars, population II ; Stars, subdwarf
Abstract:
The catalog contains data for 1225 spectroscopically classified hot
subdwarf stars. It excludes central stars of planetary nebulae but
includes stars in binary systems. The data assembled include, where
available, alternative designations, accurate coordinates, UBV and
uvby photometry, spectral types and determinations of effective
temperature and surface gravity.
Introduction:
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.