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26 April 2024 |
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Optical properties of SMC X-ray binaries | | M.J.Coe
; W.R.T.Edge
; J.L.Galache
; V.A.McBride
; | | Date: |
4 Oct 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 356 (2005) 502-514 | | Subject: | astro-ph | | Affiliation: | Southampton University | | Abstract: | This work represent the first major study of the optical and IR characteristics of the mass donor companions to the X-ray pulsars in the Small Magellanic Cloud (SMC). In this work several new counterparts have been identified, and possible ones confirmed, as companions to X-ray pulsars in the SMC giving a total of 34 such objects now identified. In addition this work presents three new binary periods and confirms two X-ray periods using optical data for objects in this group. This homogeneous sample has been studied as a group to determine important general characteristics that may offer insight into the evolution of such systems. In particular, the spectral class distribution shows a much greater agreement with those of isolated Be stars, and appears to be in some disagreement with the galactic population of Be stars in Be/X-ray binaries. Studies of the long term optical modulation of the Be star companions reveal an extremely variable group of objects, a fact which will almost certainly make a major contribution to the pronounced X-ray variability. The spatial distribution of these systems within the SMC is investigated and strongly suggests a link between massive star formation and the HI density distribution. Finally, studies of the circumstellar disk characteristics reveal a strong link with optical variability offering important clues into the long-term stability of such disks. | | Source: | arXiv, astro-ph/0410074 | | Services: | Forum | Review | PDF | Favorites | |
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