The detection of binary companions to subdwarf B stars

Details The detection of binary companions to subdwarf B stars The detection of binary companions to subdwarf B stars

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298..179j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 1, pp. 179-184.

Astronomy and Astrophysics

Astronomy

30

Binaries: Spectroscopic, Stars: Early-Type, Subdwarfs

Scientific paper

Intermediate dispersion spectroscopy of a sample of 40 hot subdwarf B stars between 5500 and 9000Angstroms has been obtained. The sample includes a large fraction of targets which have been studied photometrically. Seven targets show strong lines arising from the infrared Caii triplet, the unequivocal signature of a cool companion. The positiveCaii identifications include known photometric binaries and new targets; all are associated with a photometric red excess. Assuming a canonical value for the subdwarf luminosity, all of the detected companions are overluminous compared with the main sequence. The detection procedure indicates an improved and more secure method for the measurement of the binary frequency of hot subdwarfs.

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