Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-05
Astrophys.Space Sci.291:337,2004; Astrophys.Space Sci.291:337-340,2004
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure. To appear in "Extreme Horizontal Branch Stars and Related Objects", Astrophysics and Space Science, Kluwer
Scientific paper
10.1023/B:ASTR.0000044341.36911.
We discuss whether the hypothesis that "all (or most) subdwarfs are in close binaries" is supported by the frequently reported observations of photometrically or spectroscopically composite character of many hot subdwarf stars. By way of a possible counter-argument, we focus on resolved companions (optical pairs) of hot subdwarf stars. On a statistical basis, many of these are physically associated with the hot subdwarfs, i.e. are common proper motion pairs. These resolved pairs make a several percent contribution to the catalog of hot subdwarf stars per decade in projected separation. If they are just the relatively wide members of a binary population similar to the local G-dwarf binary population (Duquennoy & Mayor 1991), which has a very wide distribution of orbital separations, then many of the unresolved but composite hot subdwarf binaries may not be "close" in the astrophysical sense. In that case, binary channels for hot subdwarf formation may be less important than thought, or must involve companions (white dwarfs) that do not result in a composite spectrum system.
Stark Michele A.
Wade Richard A.
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