Other
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.262..116h&link_type=abstract
Nature, vol. 262, July 8, 1976, p. 116-118.
Other
30
Binary Stars, Light Curve, Mass Transfer, Stellar Mass, Supergiant Stars, Astronomical Photometry, H Alpha Line, Line Shape
Scientific paper
Results of continuous uvby beta photometry of Sigma Orionis E carried out on 11 consecutive nights are presented. The light and color curves show two distinct minima with widths of about 0.3 h at half-depth. The secondary minimum follows the primary by 0.43 P. The general appearance of the light curves of Sigma Orionis E, and that of the H alpha profile when the emission is strong, are strikingly similar to observed properties of the dwarf nova system U Geminorum. These properties have been interpreted (Kraft, 1962; Krzeminski, 1965) in terms of a mass-transfer binary in which a collapsed component is surrounded by a rapidly rotating accretion disk containing an ultraviolet-bright spot with energy provided by the impinging stream of gas from the other star. It is suggested that a similar model could account for most of the principal characteristics of the light, color and spectrum variations in Sigma Orionis E. Alternatively, the light curves can be interpreted as components of a single 'W-shaped' eclipse.
Hesser James Edward
Ugarte P. P.
Walborn Nolan R.
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