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Multiwaveband studies of the hard ROSAT SMC transient 1WGA J0053.8-7226: a new X-ray pulsar | | D.A.H. Buckley
; M.J. Coe
; J.B. Stephens
; K. van der Heyden
; L. Angelini
; N. White
; P. Giommi
; | | Date: |
30 Aug 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 320 (2001) 281 | | Subject: | astro-ph | | Affiliation: | SAAO), M.J. Coe (Southampton), J.B. Stephens (Southampton), K. van der Heyden (SAAO), L. Angelini (NASA/GSFC), N. White (NASA/GSFC) and P. Giommi (NASA/GSFC | | 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. | | Source: | arXiv, astro-ph/0008486 | | Services: | Forum | Review | PDF | Favorites | |
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