Discovery of the Optical Counterpart of the Soft X-Ray Transient GRO:J0422+32

Details Discovery of the Optical Counterpart of the Soft X-Ray Transient GRO:J0422+32 Discovery of the Optical Counterpart of the Soft X-Ray Transient GRO:J0422+32

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276l..37c&link_type=abstract

Astronomy and Astrophysics, Vol.276, NO. 2/SEPII, P. L37, 1993

Astronomy and Astrophysics

Astrophysics

29

X-Rays: Stars - Binaries: General- Stars: Neutron

Scientific paper

We report the discovery of the optical counterpart of the type II Soft X-ray Transient. GRO J0422+32 on 1992 August 15. ten days after the outburst. as well as the optical light curve during the first 100 days after the outburst, making GRO J0422+32 the slowest one in the optical decline. Archival plates searches show that the object did not undergo a similar outburst after 1928. Its optical and X-ray evolution is similar to other members of its class. like V616 Mon. V404 Cyg and GRS 1124-68. For these later three there are dynamical evidences that place them among the best black holes candidates so far. These similarities suggest that the compact object in GRO J0422+32 may also be a black hole.

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