Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mst...........h&link_type=abstract
M. S. Thesis - Central Michigan University
Astronomy and Astrophysics
Astrophysics
10
Stars: Variables: Individual (Am Leonis), Binaries: Eclipsing
Scientific paper
The analyses of the light variations of eclipsing binary systems provide such basic astrophysical information as the stellar masses, radii, luminosities, surface brightness, limb darkening coefficients and the existence of star spots. The short-period eclipsing binary AM Leonis is an interesting system that is the brighter component of a visual binary. It has been the subject of a number of photometric studies, but still lacks a satisfactory light curve solution. This is due largely to the fact that brightness measurements to date have included the light of the visual companion. Existing photometry suggests that the light curve changes over time. New CCD observations of AM Leonis, obtained in 2002 and 1993, and photoelectric photometry observations, obtained in 1991, are presented. Light curves in the standard U, B, V, R and I passbands have been constructed. Light curves both excluding and including the close visual companion of AM Leonis were obtained. The curves with the companion excluded are suitable for a critical light curve solution of this system and allow for a direct measure of the "third light" contribution of the companion star of L3 = 0.26 in the V passband. Eight new times of minima were found and a comparison to past observations indicates that the period of AM Leonis has undergone a change between 1998 and 2002.
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