2008AJ....136..337Z -
Astron. J., 136, 337-343 (2008/July-0)
The first multi-color photometric study of the near-contact binary AS Serpentis.
ZHU L.-Y., QIAN S.-B. and YANG Y.-G.
Abstract (from CDS):
The first complete multi-color CCD photometric light curves of the eclipsing binary AS Ser were obtained over three nights in 2005. Using the latest Wilson-Devinney (WD) code, we computed the photometric elements of this system. It turns out that AS Ser is a near-contact binary system with both components filling more than 99% of their Roche lobes. It belongs to a marginal contact binary system within the parameter uncertainties. The marginal characteristic of AS Ser reveals that this target may be in a rare phase predicted by the thermal relaxation oscillation (TRO) theory. The asymmetry of the light curves can be explained by a dark spot on the secondary component, which is consistent with its late-type nature. Combining all available times of light minimum, we derived a new orbital period of AS Ser and found a periodic oscillation varying within an amplitude of 0.0049 days and a period of 11.8 years. This period change may be the result of the light-time effect due to a presumed tertiary component (M3> 0.28M☉) or might result from magnetic activity cycles of the two components.
Abstract Copyright:
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Journal keyword(s):
binaries: close - binaries: eclipsing - stars: evolution - stars: individual: AS Serpentis
Simbad objects:
20
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