The identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009
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. Partially based on observations carried out at ESO, La Silla, Chile (65.H--0005).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2001
- DOI:
- 10.1051/0004-6361:20010417
- arXiv:
- arXiv:astro-ph/0103421
- Bibcode:
- 2001A&A...371.1018I
- Keywords:
-
- STARS: INDIVIDUAL:;
- GS 1843+009;
- GS 1843+009HRI\;
- BINARIES: GENERAL;
- STARS: PULSARS: GENERAL;
- STARS: EMISSION-LINE;
- BE;
- X-RAYS: STARS;
- Astrophysics
- E-Print:
- 6 pages (3 figures included). Accepted for publication in A&