Other
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..256a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, July 20, 1991, p. 256-259.
Other
13
B Stars, H Ii Regions, Light Emission, X Ray Binaries, Accretion Disks, Stellar Radiation, Ultraviolet Radiation, X Rays
Scientific paper
Be stars show enhancement of optical emission up to a few magnitudes. Optical continuum enhancements due to (1) conversion of Lyman continuum photons of the Be star to visual photons in the envelope of the Be star, (2) emission from the H II region formed by X-ray and EUV emission from a compact object in binary motion around the Be star, and (3) emission from an accretion disk around the compact object, are considered. These considerations indicate that large increases of optical emission (above 0.5 mag) would need an ionizing source other than the Be star (for example, an accreting compact object emitting radiation). Specific examples of large increases of optical emission as in the sources Gamma Cas and 4U 0115 + 63 are discussed.
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