Two ROSAT HRI observations of GRO J1655-40.

Details Two ROSAT HRI observations of GRO J1655-40. Two ROSAT HRI observations of GRO J1655-40.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.239g&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.239-242

Astronomy and Astrophysics

Astrophysics

2

Stars: Individual: Gro J1655-40, X-Rays: Stars, Stars: Distances, Binaries: Eclipsing, Accretion, Accretion Disk

Scientific paper

GRO J1655-40 was observed with the ROSAT HRI on two occasions: ones (in August 1994) between the first and the second outbursts in 1994, and ones between a soft and a hard X-ray outburst (in March 1995). The first observation allowed to improve the X-ray position, thus confirming the optical and radio identification. In addition, a distance of d=~3kpc is derived using the dust scattering halo. The combination with radio measurements suggests that the X-ray emission originated in an accretion disk or corona rather then in a jet. The results of the second ROSAT observation and the comparison with earlier TTM observations suggest that the X-rays at this epoch were emitted from an accretion disk.

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