Issue |
A&A
Volume 389, Number 1, July I 2002
|
|
---|---|---|
Page(s) | L11 - L14 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20020650 | |
Published online | 14 June 2002 |
Letter to the Editor
The infrared counterpart of the X-ray burster KS 1731–260 *,**
1
ESO, Karl Schwarzschild Str. 2, 85748 Garching bei München, Germany
2
The Open University, Department of Physics and Astronomy Walton Hall, Milton Keynes, MK7 6AA, UK
3
Service d'Astrophysique / CEA, CE-Saclay, 91191 Gif-sur-Yvette, France
4
Instituto de Astronomía y Física del Espacio/CONICET. cc5, 1428 Bs As, Argentina
5
Istituto di Astrofisica Spaziale e Fisica Cosmica CNR, Sezione di Milano “G.Occhialini”, via Bassini 15, 20133 Milano, Italy
Corresponding author: R. P. Mignani, rmignani@eso.org
Received:
8
March
2002
Accepted:
26
April
2002
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. [CITE]), for which we
measure and
. 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. [CITE]), obtained with the source in quiescence, our photometry
confirms the fading of the counterpart during the decay of the
RXTE/ASM lightcurve.
Key words: X-ray binaries, KS 1731–260
© ESO, 2002
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