Bibcode
Shahbaz, T.; Groot, P.; Phillips, S. N.; Casares, J.; Charles, P. A.; van Paradijs, J.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 314, Issue 4, pp. 747-752.
Advertised on:
6
2000
Citations
24
Refereed citations
22
Description
We have obtained intermediate resolution optical spectra of the
black-hole candidate Nova Sco 1994 in 1996 June, 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+/-10kms-1 a value which is 30per cent larger than the
value obtained when the source is in quiescence. Our large value for
K2 is consistent with 60-7+9per cent of the secondary star's
surface being heated, compared with 35per 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.