The Infrared Counterpart of the X-ray Burster KS 1731--260

Details The Infrared Counterpart of the X-ray Burster KS 1731--260 The Infrared Counterpart of the X-ray Burster KS 1731--260

2002-05-06

arxiv.org/abs/astro-ph/0205081v1

Astronomy and Astrophysics

Astrophysics

4 pages, LaTex, 5 Postscript figures. Astronomy & Astrophysics Letter, accepted

Scientific paper

10.1051/0004-6361:20020650

We present JK' infrared images of the X-ray transient KS 1731--260, obtained in 1997 and in 1998 with IRAC2b at the ESO/MPI 2.2-m telescope at La Silla. Using as a reference the recent Chandra position, we confirm the identification of the X-ray source with the previously proposed counterpart (Wijnands et al. 2001b), for which we measure J=17.32 +/- 0.2 and K' = 16.36 +/- 0.18. The source was entering a low X-ray state at the epoch of our observations, and the accretion disk was still dominating the infrared flux. Indeed, when compared with the only published magnitudes in the J-band (Orosz et al. 2001), obtained with the source in quiescence, our photometry confirms the fading of the counterpart during the decay of the RXTE/ASM lightcurve.

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