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Astron. Astrophys. 348, 888-896 (1999)

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

J.S. Clark 1, I.A. Steele 2, R.P. Fender 3 and M.J. Coe 4

1 Astronomy Centre, CPES, University of Sussex, Brighton, BN1 9QH, UK
2 Astrophysics Research Institute, Liverpool John Moores University, Liverpool, L41 1LD, UK
3 Astronomical Institute Anton Pannekoek, University of Amsterdam and Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
4 Department of Physics and Astronomy, Southampton University, Highfield, Southampton, UK

Received 30 November 1998 / Accepted 28 April 1999

Abstract

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.

Key words: stars: circumstellar matter – stars: emission-line, Be

Send offprint requests to: J.S. Clark

Correspondence to: jsc@star.cpes.susx.ac.uk

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© European Southern Observatory (ESO) 1999

Online publication: August 13, 199
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