Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sass...26...61s&link_type=abstract
The Society for Astronomical Sciences 26th Annual Symposium on Telescope Science. Held May 22-24, 2007 at Big Bear, CA. Publishe
Other
Scientific paper
The eclipsing binary system AP LEO is an overcontact binary of W UMa type with low surface temperature and a short period of 0.43 days and with a mass ratio well below unity. Monitoring lightcurves published in 1989 and 1993 displayed changes to this contact system uncommon in such a short period. New CCD photometric lightcurves in the V and R bands are presented. O-C values have been computed using thirteen new times of light minimums along with 62 minimums previously published in the literature. A sinusoidal trend is apparent and several authors have interpreted this small amplitude cyclic oscillation to a triple system containing a third component. This shallow sine curve is superposed on an increasing secular period. The most recent spectroscopic study classified the spectral type as F7-8 V. Photometric solutions of the lightcurve and computed parameters are compared with five other investigations of the binary system. The changes in the parameters in such a brief time indicate the orbital period variations are caused by mass transfer from the primary star to the secondary causing a decrease or change in angular momentum loss.
Lapham John
Snyder Leoy F.
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