| Issue |
A&A
Volume 394, Number 2, November I 2002
|
|
|---|---|---|
| Page(s) | 625 - 632 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20021163 | |
| Published online | 15 October 2002 | |
PX Andromedae: Superhumps and variable eclipse depth*
1
Institute of Astronomy, Bulgarian Academy of Sciences, 72, Tsarighradsko Shousse Blvd., 1784 Sofia, Bulgaria
2
Royal Observatory of Belgium, Avenue Circulaire 3, 1180 Brussels, Belgium
Corresponding authors: V. Stanishev, vall@astro.bas.bg zk@astro.bas.bg
Received:
29
April
2002
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, 48 and 0207. 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:
![$T_{\min}[{\rm HJD}]=49238.83662(14)+0\fd146352739(11)E$](/articles/aa/abs/2002/41/aa2639/aa2639_tex_eq4.png)
.
Key words: accretion, accretion disks / stars: individual: PX And / stars: novae, cataclysmic variables / X-ray: stars
© ESO, 2002
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