Resolving sdB binary systems

Details Resolving sdB binary systems Resolving sdB binary systems

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7409h&link_type=abstract

HST Proposal ID #7409

Physics

Hst Proposal Id #7409 Hot Stars And Stellar Corpses

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. 52 sdB binary systems brighter than V=magpt150 are known and have spectroscopic distances between 200pc and 1500pc. We demonstrate that 1/3 to 1/2 of them should be resolvable on short exposure R-band PC images if the non-interacting evolutionary scenario holds. None is expected in the alternative case. Hence a snapshot survey will yield decisive constraints for the origin of sdB stars. Exposure times are short enough {1s to 10s} to fit into small schedule gaps. This is a continuation of the approved cycle 6 Proposal No. 6351, which for unlucky circumstances did not succeed to obtain any data until 8/30/96.

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