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)

2000-01-13

arxiv.org/abs/astro-ph/0001227v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03341.x

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; a value which is 30 per cent larger than the value obtained when the source is in quiescence. Our large value for K_2 is consistent with 60 +9,-7 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 K_2.

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