A closer look at the X-ray transient XTE J1908+094: identification of two new near-infrared candidate counterparts

Details A closer look at the X-ray transient XTE J1908+094: identification of two new near-infrared candidate counterparts A closer look at the X-ray transient XTE J1908+094: identification of two new near-infrared candidate counterparts

2005-11-18

arxiv.org/abs/astro-ph/0511560v1

Mon.Not.Roy.Astron.Soc.365:1387-1391,2006

Astronomy and Astrophysics

Astrophysics

accepted for publication in MNRAS, 5 pages, 3 figures

Scientific paper

10.1111/j.1365-2966.2005.09838.x

We had reported in Chaty, Mignani, Israel (2002) on the near-infrared (NIR) identification of a possible counterpart to the black hole candidate XTE J1908+094 obtained with the ESO/NTT. Here, we present new, follow-up, CFHT adaptive optics observations of the XTE J1908+094 field, which resolved the previously proposed counterpart in two objects separated by about 0.8". Assuming that both objects are potential candidate counterparts, we derive that the binary system is a low-mass system with a companion star which could be either an intermediate/late type (A-K) main sequence star at a distance of 3-10 kpc, or a late-type ($>$K) main sequence star at a distance of 1-3 kpc. However, we show that the brighter of the two objects (J ~ 20.1, H ~ 18.7, K' ~ 17.8) is more likely to be the real counterpart of the X-ray source. Its position is more compatible with our astrometric solution, and colours and magnitudes of the other object are not consistent with the lower limit of 3 kpc derived independently from the peak bolometric flux of XTE J1908+094. Further multi-wavelength observations of both candidate counterparts are crucial in order to solve the pending identification.

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