Detecting red stellar companions to hot subdwarfs with CCD imaging

Details Detecting red stellar companions to hot subdwarfs with CCD imaging Detecting red stellar companions to hot subdwarfs with CCD imaging

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..457t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. 457-462

Astronomy and Astrophysics

Astrophysics

8

B Stars, Binary Stars, Distance, Gravitation, O Stars, Stellar Models, Subdwarf Stars, Astronomical Photometry, Cameras, Charge Coupled Devices, Computer Programs, Imagery, Reflecting Telescopes

Scientific paper

A search for red stellar companions to hot subdwarfs, using BRI and Z filter CCD imaging, is presented. 5, possibly 6, companions to 20 sdB and sdO stars have been detected -- only one of which has been previously reported. For the sdB PG0822+645 the found companion corresponds to a wide binary system, which is also the case for the sdO Mrk509C. These systems should therefore be common proper motion pairs. The details of a search for a previously proposed companion to Feige 34 are given - there is no evidence for a resolvable companion, and the analysis of the photometry of the companion to the sdO Mrk509C is given. Distance and gravity for the sdO are predicted, for various assumptions.

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