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Issue A&A
Volume 371, Number 3, June I 2001
Page(s) 1018 - 1023
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010417



A&A 371, 1018-1023 (2001)
DOI: 10.1051/0004-6361:20010417

The identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009

G. L. Israel1, I. Negueruela2, 3, S. Campana4, S. Covino4, A. Di Paola1, D. H. Maxwell5, A. J. Norton5, R. Speziali1, F. Verrecchia6 and L. Stella1

1  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

(Received 21 December 2000 / Accepted 19 March 2001 )

Abstract
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 (V=20.9) and variable early type reddened star (V-R=2.1). The optical spectra show the Balmer and Paschen series in emission, while the IR observations confirm the presence of a flux excess (H=13.2, J-H=0.54), 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 $\geq$ 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

Offprint request: G. L. Israel, Gianluca.Israel@oar.mporzio.astro.it

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