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Near IR spectroscopy of candidate B[e]/X-ray binaries

Clark, J. S.; Steele, I. A.; Fender, R. P. and Coe, M. J. (1999). Near IR spectroscopy of candidate B[e]/X-ray binaries. Astronomy & Astrophysics, 348(3) pp. 888–896.

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We present near IR spectra (0.8–2.5 µm) of the two candidate B[e]/X-ray binary systems CI Cam/XTE J0421+560 and HD34921/1H 0521+37. The spectra of both systems show evidence for a more complex circumstellar environment than those seen in classical Be/X-ray binaries. Strong H I and He I emission is seen, confirming the presence of a dense circumstellar wind; O I, Fe II and [Fe II] emission in CI Cam points to recombination of this wind. He II emission, presumably due to excitation by the compact companion is observed in CI Cam. Finally, emission is seen from Na I and CO, which implies regions of the circumstellar environment with much lower excitation temperatures and higher densities, shielded from direct stellar radiation. Both systems show evidence for continuum emission from circumstellar dust. Neither of these two features has previously been observed in any other classical Be/X-ray binary system. Adopting the classification criteria of Lamers et al. (1998) we suggest identifications of unclB[e] and sgB[e] for HD34921 and CI Cam respectively, making them the first High Mass X-ray Binaries with primaries showing the B[e] phenomenon known.

Item Type: Journal Item
Copyright Holders: 1999 European Southern Observatory (ESO)
ISSN: 1432-0746
Keywords: stars; circumstellar matter; emission-line; Be
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 17773
Depositing User: Users 9108 not found.
Date Deposited: 16 Jul 2009 15:48
Last Modified: 14 Dec 2018 08:30
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