Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-14
Astron.Astrophys. 394 (2002) 625-632
Astronomy and Astrophysics
Astrophysics
LaTeX, 8 pages, 9 EPS figures, final version to appear in A&A, uses times font, few minor corrections
Scientific paper
10.1051/0004-6361:20021163
Results of a photometric study of the SW Sex novalike PX And are presented. The periodogram analysis of the observations obtained in October 2000 reveals the presence of three signals with periods of 0.142, 4.8 and 0.207 days. The first two periods are recognized as "negative superhumps" and the corresponding retrograde precession period of the accretion disk. The origin of the third periodic signal remains unknown. The observations in September-October 2001 point only to the presence of "negative superhumps" and possibly to the precession period. The origin of the "negative superhumps" is discussed and two possible mechanisms are suggested. All light curves show strong flickering activity and power spectra with a typical red noise shape. PX And shows eclipses with highly variable shape and depth. The analysis suggests that the eclipse depth is modulated with the precession period and two possible explanations of this phenomenon are discussed. An improved orbital ephemeris is also determined: T_min[HJD]=49238.83662(14)+0.146352739(11)E.
Boffin Henri. M. J.
Genkov V. V.
Kraicheva Zdravka
Stanishev Vallery
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