The discovery of the optical/IR counterpart of the 12s transient X-ray pulsar GS 0834-43

Details The discovery of the optical/IR counterpart of the 12s transient X-ray pulsar GS 0834-43 The discovery of the optical/IR counterpart of the 12s transient X-ray pulsar GS 0834-43

2000-01-06

arxiv.org/abs/astro-ph/0001085v1

Astronomy and Astrophysics

Astrophysics

6 pages. Accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03404.x

We report the discovery of the optical/infra-red counterpart of the 12.3s transient X-ray pulsar GS0834-43. We re-analysed archival ROSAT PSPC observations of GS0834-43, obtaining two new refined positions, about 14" and 18" away from the previously published one, and a new spin period measurement. Within the new error circles we found a relatively faint (V=20.1) early type reddened star (V-R=2.24). The optical spectrum shows a strong Halpha emission line. The IR observations of the field confirm the presence of an IR excess for the Halpha-emitting star (K'=11.4, J-K'=1.94) which is likely surrounded by a conspicuous circumstellar envelope. Spectroscopic and photometric data indicate a B0-2 V-IIIe spectral-type star located at a distance of 3-5kpc and confirm the Be-star/X-ray binary nature of GS0834-43.

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