Other
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..579n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 15, 1991, p. 579-583. Research supported by M
Other
31
B Stars, Stellar Spectrophotometry, X Ray Binaries, Absorption Spectra, Balmer Series, Emission Spectra, H Alpha Line, Infrared Photometry, Spectral Line Width
Scientific paper
A series of optical spectroscopic and IR photometric observations is presented of the Be/X-ray binary system X Per that was made over the last four years. Over this period the H-alpha line profile changed from emission to absorption, accompanied by a decrease in the IR flux by over a magnitude and a flattening of the IR spectrum. Such behavior is consistent with the loss of the circumstellar disk or shell of material around the Be star and the reversion to a 'normal' O/B-type star. While such behavior has been seen in the optical spectra of many other Be/B stars before, this is only the second time such observations have been made for a star in a high-mass X-ray binary system. Furthermore, the contemporaneous optical and IR data provide some of the first direct evidence that the near-IR excess and Balmer-line emission do indeed arise in the same circumstellar material.
Coe Malcolm J.
Estela A.
Fabregat Juan
Gorrod M. J.
Kastner Jason
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