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 Msun for the compact object. We constrain the rotational broadening, upsilon sin i <= 79 km s(-1) , 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 Li 1 lambda 6708 absorption line from the companion star is not detected (EW < 0.12 Angstroms), in contrast to four other X-ray binaries. An Hα Doppler image of the system shows emission from the companion star in addition to the accretion disk.
No takes yet. Share an insight, caveat, or question.
Harlaftis et al. (1997) studied this question.