Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491l..85v&link_type=abstract
Astrophysical Journal Letters v.491, p.L85
Astronomy and Astrophysics
Astronomy
16
Stars: Binaries: General, Stars: Abundances, Stars: White Dwarfs, Ultraviolet: Stars, Stars: Individual Bright Star Number: Hr 2875
Scientific paper
An extreme-ultraviolet source in the EUVE and ROSAT Wide Field Camera catalogs, also identified with a very soft ROSAT PSPC X-ray source, is coincident with the B5 V star HR 2875 (y Pup). We present an analysis of PSPC and EUVE spectra revealing the presence of a hot white dwarf companion to HR 2875, which then constitute the first confirmed B star plus white dwarf system. The B star shows variable Si II, He I, and H I line profiles in high-dispersion spectra, possibly related to its binary nature, but our measurements limit the radial velocity semiamplitude of the B star to <=2 km s-1. We speculate that the white dwarf is most likely massive, and we propose some observational tests of the model.
Berghoefer Thomas
Christian Damian
Vennes Stephane
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