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arXiv:astro-ph/0008486 (astro-ph)
[Submitted on 30 Aug 2000 (v1), last revised 31 Aug 2000 (this version, v2)]

Title:Multiwaveband studies of the hard ROSAT SMC transient 1WGA J0053.8-7226: a new X-ray pulsar

Authors:D.A.H. Buckley (SAAO), M.J. Coe (Southampton), J.B. Stephens (Southampton), K. van der Heyden (SAAO), L. Angelini (NASA/GSFC), N. White (NASA/GSFC), P. Giommi (NASA/GSFC)
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Abstract: 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.
Comments: Accepted for publication in MNRAS
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0008486
  (or arXiv:astro-ph/0008486v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0008486
Journal reference: Mon.Not.Roy.Astron.Soc. 320 (2001) 281
Related DOI: https://doi.org/10.1046/j.1365-8711.2001.03982.x

Submission history

From: Malcolm Coe [view email]
[v1] Wed, 30 Aug 2000 14:25:27 UTC (287 KB)
[v2] Thu, 31 Aug 2000 11:00:41 UTC (287 KB)
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