Resolving sdB binary systems

Details Resolving sdB binary systems Resolving sdB binary systems

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6351h&link_type=abstract

HST Proposal ID #6351

Computer Science

Hst Proposal Id #6351 Hot Stars

Scientific paper

Subluminous O and B stars dominate the populations of faint blue stars and are found in both the old disk {field sdBs} and halo populations {globular cluster members} of our own Galaxy. Subluminous B stars are now generally believed to be extreme Horizontal Branch stars. However, the origin of sdB stars is unclear and strongly under debate. Evidence has accumulated recently that a large fraction {if not all} of the sdB stars in the field are found in binary systems. Both interacting binary and {non-interacting} single star evolutionary scenarios have been proposed for the origin of the sdB stars. If the first scenario is correct, all spectroscopic and/or photometric binaries containing sdBs need to have small separation of the order of 0.1 A.U. or less. In the non- interacting case the sdB binaries should have almost the same distribution of separations as found for normal stars, i.e. there should be mostly wide systems. We have compiled a list of 52 sdB binary systems from literature which are brighter than V=magpt150 and have spectroscopic distances between 200pc and 1500pc. We demonstrate that one third to one half of the sample should be resolvable on short exposure R-band PC images if the non-interacting evolutionary scenario holds. Almost none is expected in the alternative case. Hence a snapshot survey of 25 objects from the list will yield decisive constraints for the origin of sdB stars. Exposure times are short enough {1s to 10s} to allow to use gyro hold so that each snapshot observation can be done in 3 minutes.

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