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Title: 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 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 ± 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 β} and H{sub γ} 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 ofmore » dP/dt = 2.0×10{sup –7} days yr{sup –1}, which might be explained by the angular momentum exchanges or mass transfer from the secondary to primary component.« less
Authors:
;  [1] ;  [2] ;  [3]
  1. College of Science/Department of Physics and NAOC-GZU-Sponsored Center for Astronomy Research, Guizhou University, Guiyang 550025 (China)
  2. Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003 (China)
  3. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011 (China)
Publication Date:
OSTI Identifier:
22340002
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 147; Journal Issue: 3; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; BINARY STARS; CHARGE-COUPLED DEVICES; CORRELATIONS; DIAGRAMS; ECLIPSE; EMISSION; MAGNETIC PROPERTIES; MASS TRANSFER; OSCILLATIONS; PARABOLAS; STARS; STARSPOTS; VISIBLE RADIATION