The Luminosity and Kinematics of a Sample of Hot Subdwarfs

Details The Luminosity and Kinematics of a Sample of Hot Subdwarfs The Luminosity and Kinematics of a Sample of Hot Subdwarfs

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..395v&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 395-396

Astronomy and Astrophysics

Astronomy

Scientific paper

With Hipparcos we have derived the astrometric distance of three hot subdwarf stars (sdO): BD +37deg442, BD +75deg325, BD +48deg1777, and given a lower limit to the distance of BD -3deg2179 and BD +37deg1977. We have found that these stars, which have similar effective temperatures, span a very large range of visual luminosity, from M_V < +2.2 to +4.6. In particular the stars with high velocity wind are systematically brighter. The large space motion of the order of 100 km/s is in agreement for their belonging to Population II. We also confirm the much larger brightness (M_V ~ -1.5) of the Carbon-poor, X-ray binary sdO6 star HD 49798, which in addition has a lower space motion and should therefore not belong to the same stellar group.

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