The August 1993 outburst of the black hole candidate GRO J0422+32
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1997
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Abstract
One year after the X-ray outburst, the optical counterpart of the black hole candidate GRO JO322+32 underwent an unexpected one-month outburst beginning on 10 August 1993. CCD photometry was obtained for the optical counterpart with the 1.5-m telescope at Calar Alto on 6 consecutive nigths since the onset of this event, never seen before in other transients belonging to the black-hole class. Two spectra were also taken with the 2.2-m telescope on 14 August. We suggest the Mass Transfer Instability model as possible explanation of the event on the basis of the observational facts presented here.
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Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, Spain, operated jointly by the Max-PlanckInstitut fur Astronomie (MPIA), Heidelberg, and the Spanish National Commission for Astronomy. We are grateful to N. Lund, S. Brandt, J. Fabregat and J. P. Lasota for fruitful discussions, and to A. Vitores and M. Cordero for their helping with the facilities provided for obtaining the spectrum. Also to C. Chevalier and S. Ilovaisky for the HPO data. To E. Martin for his help in the calibration of the I-band data. Finally, to J. M. Gómez Forrellad and J. Guarro for follow-up observations.