Infrared and optical observations of the newly identified Be/X-ray binary LSI + 61° 235

Creators: Coe, M. J.; Everall, C.; Norton, A. J.; Roche, P.; Unger, S. J.; Fabregat, J.; Reglero, V.; Grunsfeld, J. M.

Abstract

Observational (IR) and optical data are presented of the newly discovered Be/X-ray binary system LSI + 61° 235, taken over the period 1991 August – 1992 May. Though the IR shows little evidence for any changes, the optical Hα spectrum has undergone substantial modification. Combination of optical photometric measurements with the IR photometry allows the overall spectrum to be investigated and the existence of the Be star's circumstellar disc to be directly confirmed.

Additional Information

© 1993 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Accepted 1992 September 23. Received 1992 September 18. In original form 1992 July 20. The authors acknowledge the support, both software and data analysis, provided by Starlink which is funded by the UK SERC. We are grateful to the Service staff of the INT for providing us some of the data used here. The TCS is operated on the island of Tenerife by the Instituto de Astrofísica de Canarias in the Spanish Observatorio del Teide. The 1.23-m telescope is operated by Max Planck Institute für Astronomie in the Spanish-German Astronomical Center in the Calar Alto (Almería, Spain). The 1.5-m telescope at Mount Palomar is jointly owned by California Institute of Technology and the Carnegie Institute of Washington. PR and CE are supported on SERC studentships and SJU acknowledges financial support from Meiko Ltd.

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