A doppler map and mass-ration constraint for the black-hole x-ray nova ophiuchi 1977.

1 September 1997

journal article
Published by American Astronomical Society in The Astronomical Journal

Vol. 114, 1170-1175
https://doi.org/10.1086/118548

Abstract

We have reanalyzed Keck observations of Nova Oph 1977 to extend the work done by Filippenko et al. (1997), who recently determined a mass function f(M_x) = 4.86 +/- 0.13 M_o for the compact object. We constrain the rotational broadening, v sin i < 79 km/s, at the 90% confidence level, which gives a mass ratio q < 0.053. The K-type companion star of Nova Oph 1977 contributes 28-37% of the light at red wavelengths. The abnormal LiI 6708 absorption line from the companion star is not detected (EW < 0.12 A), in contrast to four other X-ray binaries. An Halpha Doppler image of the system shows emission from the companion star in addition to the accretion disk.Comment: 14 pages of text and tables plus 3 figures, to appear in the Astronomical Journa

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