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Title: Photometric properties for selected Algol-type binaries. VII. V404 and with magnetic activity

We present new CCD light curves of the short-period Algol-type eclipsing binary V404 And obtained in 2009-2011. The time-resolving multiple BVRI color light curves of the year 2011 with full phase coverage were analyzed simultaneously using the latest Wilson-Devinney program. We concluded that the configuration of two starspots on the primary is the most reliable explanation for the light curve distortions observed in 2011. Based on the new photometric solution, we further applied the spot model to explain the other light curves, including the previously published R-band light curves. We revealed that the starspots changed on a long timescale in terms of the spot parameters and the differences between Max. I and Max. II. Moreover, the O – C diagram spanning about 15 yr shows an upward parabola, which indicates a secular increase in the orbital period of V404 And. The orbital period increases at a rate of dP/dt = 5.3(0.3) × 10{sup –7} days yr{sup –1}, which might be interpreted by the angular momentum exchange via magnetic activity.
Authors:
; ;  [1] ;  [2]
  1. College of Science/Department of Physics and NAOC-GZU Center for Astronomy, Guizhou University, Guiyang 550025 (China)
  2. School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000 Anhui Province (China)
Publication Date:
OSTI Identifier:
22339979
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; CHARGE-COUPLED DEVICES; COLOR; CONFIGURATION; DIAGRAMS; ECLIPSE; MAGNETIC PROPERTIES; MATHEMATICAL SOLUTIONS; PARABOLAS; STARS; STARSPOTS; VISIBLE RADIATION