BL ERI - an almost-contact binary system

Details BL ERI - an almost-contact binary system BL ERI - an almost-contact binary system

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..894y&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 894-899. Research supported by the Monbusho International Scienti

Physics

Optics

10

Early Stars, Eclipsing Binary Stars, Light Curve, Roche Limit, Stellar Evolution, Stellar Spectrophotometry, Cassegrain Optics, Gallium Arsenides, Radial Velocity, Telescopes

Scientific paper

BV photoelectric and spectroscopic observations of the 0.417 day period eclipsing binary BL Eri were made. Light curves show total eclipses and a considerable photometric disturbance. The light-curve analysis reveals that both components are noncontact but nearly fill their respective critical Roche lobes and the system is almost contact. The spectral type is determined to be around G0 V. The spectrum appears double lined, giving a spectroscopic mass ratio that is in accord with the photometric mass ratio (q = 0.54). The components are undermassive for their radii and luminosities, indicating a post-main-sequence evolutionary state of the system.

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