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Session 43 - Binary Stars.
Display session, Tuesday, January 16
North Banquet Hall, Convention Center

[43.16] Complete Photometric Analysis on U,B,V Light Curves of the Near-Contact Eclipsing Binary: HL Aurigae

J. D. Gray+, R. G. Samec++ (Millikin U.)

HL Auriga (S4727 Aur) has been observed as part of our ongoing survey of observationally neglected eclipsing binaries. Complete U,B,V photometric light curves of HL Aur were obtained from December 9-15, 1994 at Lowell Observatory, Flagstaff, Arizona. The 0.79-m National Undergraduate Research Observatory (NURO) reflector was used in conjunction with a thermoelectrically cooled S-13 type PMT. Three new primary and one secondary precision epochs of minimum light were determined as follows (2449000+): 695.8909, 696.8232(1), 698.6900(7), 701.8021(5). A period study spanning 45 years was conducted utilizing more than 150 times of minima collected from the literature. The photometry has been standardized and corrected for interstellar reddening. Combining our photometry and our best synthetic light curve solution, we find that HL Auriga is in a semi-detached configuration with the primary component having a fillout of 91components have spectral types of F3 V and G5 V respectively and show a difference in temperature of \sim1200 K. \footnote[]+Visiting Astronomer, Kitt Peak National Observatory , National Optical Astronomical Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc. under contract with the National Science Foundation \footnote[]++This research was partially supported by funds from the National Science Foundation.

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