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

Israel, G. L.; Negueruela, I.; Campana, S.; Covino, S.; Di Paola, A.; Maxwell, D. H.; Norton, A. J.; Speziali, R.; Verrecchia, F. and Stella, L. (2001). The identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009. Astronomy & Astrophysics, 371(3) pp. 1018–1023.

DOI: https://doi.org/10.1051/0004-6361:20010417

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 ≥ 10 kpc confirming the Be-star/X-ray binary nature of GS 1843+009.

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