MAGNETIC ACTIVITY AND ORBITAL PERIOD VARIATION OF THE SHORT-PERIOD ECLIPSING BINARY DV Psc
We present six new BVR sub(c)I sub(c) CCD light curves of a short-period RS CVn binary DV Psc obtained in 2010-2012. The light curve distortions change on both short and long timescales, which is explained by two starspots on the primary component. Moreover, five new flare events were detected and t...
Saved in:
Published in | The Astronomical journal Vol. 147; no. 3; pp. 1 - 12 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.03.2014
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We present six new BVR sub(c)I sub(c) CCD light curves of a short-period RS CVn binary DV Psc obtained in 2010-2012. The light curve distortions change on both short and long timescales, which is explained by two starspots on the primary component. Moreover, five new flare events were detected and the flare ratio of DV Psc is about 0.082 flares per hour. There is a possible relation between the phases (longitude) of the flares and starspots for all of the available data of late-type binaries, which implies a correlation of the stellar activity of the spots and flares. The cyclic oscillation, with a period of 4.9 + or - 0.4 yr, may result from the magnetic activity cycle, identified by the variability of Max. I-Max. II. Until now, there were no spectroscopic studies of chromospheric activity indicators of the H sub( beta ) and H sub( gamma ) lines for DV Psc. Our observations of these indicators show that DV Psc is active, with excess emissions. The updated O - C diagram with an observing time span of about 15 yr shows an upward parabola, which indicates a secular increase in the orbital period of DV Psc. The orbital period secularly increases at a rate of dP/dt = 2.0x10 super(-7) days yr super(-1), which might be explained by the angular momentum exchanges or mass transfer from the secondary to primary component. |
---|---|
Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0004-6256 1538-3881 1538-3881 |
DOI: | 10.1088/0004-6256/147/3/50 |