Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..493r&link_type=abstract
Astronomy Letters, Volume 25, Issue 8, August 1999, pp.493-500
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The SIGMA/GRANAT observations of the Galactic-center region in the fall of 1997 and the GRANAT and RXTE observations of the soft X-ray nova XTE J1755-324 in 1997 are presented. The light curve of XTE J1755-324 is typical of X-ray novae, with the exception of a slightly shorter e-folding decline time of the X-ray flux and the time between the primary and subsequent maxima of the light curve. At maximum light, the source exhibited a two-component spectrum, which is typical of X-ray novae, with a temperature of the inner edge of the optically thick region in the accretion disk Tin 0.8 keV and a photon index of the hard spectral component alpha 2.0. For an assumed distance of 8.5 kpc to XTE J1755-324, its maximum 0.1-100-keV luminosity is estimated to be L_x 1038 erg/s. An interesting feature of the source's spectral evolution is a short period of increase in its hardness, 10 days, before the tertiary maximum of the X-ray light curve. During this event, the source was detected in hard X-rays by the SIGMA/GRANAT telescope. During the last RXTE observations, the source was in a low/hard spectral state with a luminosity L 2 x 1036 erg/s within 100 days after the outburst onset. The temporal and spectral evolution of XTE J1755-324 resembles in pattern the evolution of "canonical" X-ray novae, such as the X-ray nova Muscae 1991. This suggests that the compact object in this system is a black hole.
Borrel Vincent
Bouchet Laurent
Churazov Evgenii M.
D'Yachkov A. V.
Gilfanov M. R.
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