Irradiation of the secondary star in X-ray Nova Scorpii 1994 (=GRO J1655-40)

Details Irradiation of the secondary star in X-ray Nova Scorpii 1994 (=GRO J1655-40) Irradiation of the secondary star in X-ray Nova Scorpii 1994 (=GRO J1655-40)

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..922s&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Other

Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, X-Ray Binaries, Cataclysmic Binaries, Symbiotic Stars, X-Ray Sources, X-Ray Bursts, Black Holes

Scientific paper

We have obtained intermediate resolution optical spectra of the black-hole candidate Nova Sco 1994 in June 1996, when the source was in an X-ray/optical active state (R~15.05). We measure the radial velocity curve of the secondary star and obtain a semi-amplitude of 279+/-10 km s-1 a value which is 30 per cent larger than the value obtained when the source is in quiescence. Our large value for K2 is consistent with 60 per cent of the secondary star's surface being heated; compared to 35 per cent, which is what one would expect if only the inner face of the secondary star were irradiated. Effects such as irradiation-induced flows on the secondary star may be important in explaining the observed large value for K2. .

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