Volume 371, Number 3, June I 2001
|Page(s)||1018 - 1023|
|Section||Interstellar and circumstellar matter|
|Published online||15 June 2001|
The identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009*
Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monteporzio Catone, Italy
2 Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
3 SAX Science Data Center, ASI c/o Telespazio, via Corcolle 19, 00131 Roma, Italy
4 Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy
5 Dept. of Physics & Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
6 Dipartimento di Fisica, Università degli Studi "La Sapienza", Piazza A. Moro 5, 00185 Roma, Italy
Corresponding author: G. L. Israel, Gianluca.Israel@oar.mporzio.astro.it
Accepted: 19 March 2001
We report on the identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009. We re-analysed an archival ROSAT HRI observation of GS 1843+009 obtaining a new refined position. The optical and IR follow-up observations carried out for the new error circle allowed us to find a relatively faint () and variable early type reddened star (). The optical spectra show the Balmer and Paschen series in emission, while the IR observations confirm the presence of a flux excess (, ), suggesting that the star is surrounded by a circumstellar envelope. Spectroscopic and photometric data together indicate a B0-B2 IV-Ve spectral-type star located at a distance of ≥ 10 kpc confirming the Be-star/X-ray binary nature of GS 1843+009.
Key words: stars: individual: / GS 1843+009; 1BMW J184536.8+005148 / binaries: general / stars: pulsars: general / stars: emission-line, Be / X-rays: stars
© ESO, 2001
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