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

By G. Israel, I. Negueruela, S. Campana, S. Covino, A. Paola, D. H. Maxwell, A. J. Norton, R. Speziali, F. Verrecchia, L. Stella. 2001

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We report on the identication 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 rened position. The optical and IR follow{up observations carried out for the new error circle allowed us to nd a relatively faint (V =2 0:9) 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 conrm the presence of a flux excess (H =1 3:2, 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 conrming the Be{ star/X{ray binary nature of GS 1843+009.

Subfields: Astronomy and Astrophysics, Geophysics

View Paper: https://www.semanticscholar.org/paper/5510511281516932da5f53694ab493a049ff22bb

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