The Spacelab-1 Very Wide Field survey of UV-excess objects. I - CPD-71 deg 172 AB, a new binary with a hot subdwarf

Details The Spacelab-1 Very Wide Field survey of UV-excess objects. I - CPD-71 deg 172 AB, a new binary with a hot subdwarf The Spacelab-1 Very Wide Field survey of UV-excess objects. I - CPD-71 deg 172 AB, a new binary with a hot subdwarf

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205..147v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 147-154.

Astronomy and Astrophysics

Astronomy

11

Binary Stars, Hot Stars, Spacelab Payloads, Stellar Luminosity, Subdwarf Stars, Ultraviolet Astronomy, Cool Stars, Iue, Sky Surveys (Astronomy), Stellar Temperature

Scientific paper

The images taken with the Very Wide Field Camera aboard Spacelab-1 have revealed a variety of stellar objects with strong UV excess. UV(IUE) and ground-based observations of the first object identified (CPD -71°172) have demonstrated a binary system comprising a cool, moderately-evolved star (F3-F4 IV), and a hot OB subdwarf with Teff ≈ 60000K. From the cool primary, and using optical multicolour data, the authors derive a distance modulus of 9.2±0.3 for the system, yielding a bolometric flux for the hot secondary of log (L/L_sun;) = 2.8±0.2 and a radius of (0.24±0.04)R_sun;. Its gross chemical composition, estimated by comparisons with UV data on several known subdwarfs, indicates that it belongs to the rare He-poor sdO's with Teff > 40000K.

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