Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-30
Mon.Not.Roy.Astron.Soc. 320 (2001) 281
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2001.03982.x
We report on two optical candidates for the counterpart to an X-ray source in the SMC, 1WGA J0053.8-7226, identified as a serendipitous X-ray source from the ROSAT PSPC archive, and also observed by the Einstein IPC. Its X-ray properties, namely the hard X-ray spectrum, flux variability and column density indicate a hard, transient source, with a luminosity of 3.8 x 10E35 ergs/sec. XTE and ASCA observations have confirmed the source to be an X-ray pulsar, with a 46 s spin period. Our optical observations reveal two possible candidates within the error circle. Both exhibit strong H alpha and weaker H beta emission. The optical colours indicate that both objects are Be-type stars. The Be nature of the stars implies that the counterpart is most likely a Be/X-ray binary system. Subsequent IR photometry JHK of one of the objects shows the source varies by at least 0.5 mag, while the (J-K) measured nearly simultaneously with the UBVRI and spectroscopic observations indicate an IR-excess of approximately 0.3 magnitudes.
Angelini Leonardo
Buckley David A. H.
Coe Malcolm J.
der Heyden Kurt van
Giommi Paolo
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