Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18510201r&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #102.01; Bulletin of the American Astronomical Society, Vol. 26, p.1483
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We have conducted a productive campaign of spectral and photometric observations of the 'quiescent' optical counterpart of X-Nova Oph 1977 at CTIO during 1994 July. Five nights of photometry were analyzed to derive a binary period of 12.51 +/- 0.03 hours. The light curve displays a typical double-wave pattern, with a modulation of +/- 0.3 mag about the mean brightness, V ~ 21.3. Forty spectra were obtained with the 4 m telescope (2000 s each), complementing 13 similar observations performed at CTIO during 1993 May. Strong and broadened Hα emission suggests that low-level accretion continues ~ 17 years after X-ray outburst, similar to the behavior seen in the black hole binary, A0620-00. However, unusual changes in the emission-line profile in X-Nova Oph have occurred during 1993-94. The spectra were analyzed with 3 methods in the attempt to extract radial velocities of absorption lines from the secondary star, using cross correlations against seve! ral stars with G or K spectral ty
Bailyn Charles D.
McClintock Jeffrey E.
Orosz Jerome A.
Remillard Ronald A.
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