Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1104g&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #11.04; Bulletin of the American Astronomical Society, Vol. 26, p.1324
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present the most recent results from our optical spectroscopy campaign on the X-ray Nova/Black Hole Candidate GRO J0422+32. Spectroscopy from the MMT during September 1994, when the system was at R=21 shows that the equivalent width of the H-alpha emission line is 150 Angstroms. Earlier Spectroscopy from March 1994, when the system was at R=20, shows a equivalent width of 100 Angstroms, and from Oct 1993, when the system was at R=19, shows an equivalent width of ~ 40 Angstroms. From our extensive Oct 1993 data, we find H-alpha velocity variations on a 5.1 hour period with a semi-amplitude of K=30km/sec. The relative phasing of these velocity variations and the photometric and velocity variation of the He-II 4686 emission line found by Casares et.al 1994 (poster paper at IAUS 165) may be taken as evidence that the mass of the compact object is M_x > 9.3{Msun}, the mass ratio q ~ 0.04, and the photometric variations may be caused by a either a x-ray heating effect or a partial eclipse of the disk by the secondary. However, these conclusions are not secure, and must be confirmed by observations of the system in quiescence.
Callanan Paul
Garcia Murillo R.
McClintock Jeffrey
Zhao Peng
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