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Period changes and photometric solution of AP Leonis
The results of BV photometry of AP Leonis are presented. Photometricanalysis is carried out by using the Wilson-Devinney program. Thesolution shows that the system is an over-contact binary with anover-contact degree of 23.5 percent and its mass ratio q equal to 0.301.A starspot group is found in the low latitude region on the secondarycomponent. The average temperature of the spot is about 1220 K lowerthan that of surrounding photosphere. The light minimum times observedover ninety years are collected. The O-C curve of minima reveals thatthe period of AP Leo changes with the time in a pseudosinusoidal patternand there is probably a third body in the system.
| Period changes of AP Leonis and its photometric solution
The photometry of AP Leonis is analyzed using the Wilson-Devinneyprogram. The star is found to be an overcontact binary with anovercontact of 23.5 percent; the mass ratio is 0.301. There may be astarspot group in the low latitude region of the second component. Theaverage temperature of the starspot is 1220 K lower than the surfacetemperature of the second component. An O-C diagram of the minimum timeswith period changes of sine and emphemeris is presented. The possibilityof the existence of a third body in the system is noted.
| Photoelectric Observations of AP Leonis and its Period Changes
Not Available
| Photoelectric observations of lunar occultations. XI
Occultation observations of 466 events are presented. These includediameter measures of Aldebaran under very bad conditions and a gooddiameter measure of 82 Vir. The list includes 91 reappearances andobservations of 34 double or multiple stars, both new and previouslyknown. The inconsistencies of the observations of Kui 88 are discussed.Further observations are most desirable.
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Observation and Astrometry data
| Constellation: | しし座 |
| Right ascension: | 11h04m24.61s |
| Declination: | +05°03'08.7" |
| Apparent magnitude: | 9.657 |
| Proper motion RA: | -61.4 |
| Proper motion Dec: | 80.6 |
| B-T magnitude: | 10.267 |
| V-T magnitude: | 9.708 |
Catalogs and designations:
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