The period behaviour of the spotted binary XY UMa.
Abstract
The O-C diagram constructed from the time instants of extrema of available XY UMa light curves gives evidence for period changes, which seem to be due not only as a consequence of the light curve asymmetries. From the timing of contacts and primary and secondary minima, indications were found for a long term variation of the period with a cycle length of 25 or 40 yrs. One possible explanation is the hypothesis of a third body (K5-M2 dwarf) revolving around the close binary. Such an interpretation leads to a nearly perfect correlation between the curve asymmetry and the residual O-C's.
- Publication:
-
Acta Astronomica
- Pub Date:
- 1990
- Bibcode:
- 1990AcA....40..245P
- Keywords:
-
- Binary Stars;
- Light Curve;
- Periodic Variations;
- Stellar Activity;
- Astronomical Photography;
- Astronomical Photometry;
- Stellar Mass Ejection;
- Astrophysics