First light curve and period study of LO Andromedae

Details First light curve and period study of LO Andromedae First light curve and period study of LO Andromedae

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005an....326...43g&link_type=abstract

Astronomiche Nachrichten, Vol. 326, p. 43

Astronomy and Astrophysics

Astronomy

1

Binaries: Eclipsing Stars: Individual (Lo And), Binaries: Eclipsing, Stars: Individual (Lo And)

Scientific paper

New BV light curves and times of minimum light for the short period W UMa system LO And were analyzed to derive the preliminary physical parameters of the system. The light curves were obtained at Ankara University Observatory during 5 nights in 2003. A new ephemeris is determined for the times of primary minimum. The analysis of the light curves is made using the Wilson-Devinney 2003 code. The present solution reveals that LO And has a photometric mass ratio q = 0.371 and is an A-type contact binary. The period of the system is still increasing, which can be attributed to light-time effect and mass transfer between the components. With the assumption of coplanar orbit of the third body the revealed mass is M3 = 0.21M. If the period change dP/dt = 0.0212 sec/yr is caused only by the mass transfer between components (from the lighter component to the heavier) the calculated mass transfer rate is dm/dt = 1.682 10-7M/yr. The absolute radii and masses estimated for the components, based on our photometric solution and the absolute parameters of the systems which have nearly same period are R1 = 1.30R, R2 = 0.85R, M1 = 1.31M, M2 = 0.49M respectively for the primary and secondary components.

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