SIMBAD references

1994A&A...292..457T - Astronomy and Astrophysics, volume 292, 457-462 (1994/12-2)

Detecting red stellar companions to hot subdwarfs with CCD imaging.

THEJLL P., THEISSEN A. and JIMENEZ R.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: PG 0822+645, Mrk 509C, subdwarfs, visual binaries

Nomenclature: [TTJ94] Feige 34 A (Nos A-B, G).

CDS comments: T.3: Coordinates of star Mrk 309C are 2000, not 1950.

Simbad objects: 16

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