Photometric investigation of a very short period W UMa-type binary - Does CE Leonis have a large superluminous area?

Details Photometric investigation of a very short period W UMa-type binary - Does CE Leonis have a large superluminous area? Photometric investigation of a very short period W UMa-type binary - Does CE Leonis have a large superluminous area?

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..318s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 318-336.

Astronomy and Astrophysics

Astronomy

21

Astronomical Photometry, Eclipsing Binary Stars, Light Curve, Starspots, Stellar Luminosity, Astronomical Observatories, Ephemerides, Variable Stars

Scientific paper

A complete photometric analysis of BVRI Johnson-Cousins photometry of the high northern latitude galactic variable, CE Leo is presented. These observations were taken at Kitt Peak National Observatory on May 31, 1989-June 7, 1989. Three new precise epochs of minimum light were determined and a linear and a quadratic ephemeris were computed from these and previous data covering 28 years of observation. The light curves reveal that the system undergoes a brief 20 min totality in the primary eclipse, indicating that CE Leo is a W UMa W-type binary. A systemic velocity of about -40 km/s was determined. Standard magnitudes were found and a simultaneous solution of the B, V, R, I light curves was computed using the new Wilson-Devinney synthetic light curve code which has the capability of automatically adjusting star spots. The solution indicates that the system consists of two early K-type dwarfs in marginal contact with a fill-out factor less than 3 percent. Evidence for the presence of a large (45 deg radius) superluminous area on the cooler component is given.

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