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Title: Photometric analysis of overcontact binaries AK Her, HI Dra, V1128 Tau, and V2612 Oph

We analyze new, high quality multicolor light curves of four overcontact binaries: AK Her, HI Dra, V1128 Tau, and V2612 Oph, and determine their orbital and physical parameters using the modeling program of G. Djurasevic and recently published results of radial velocity studies. The achieved precision in absolute masses is between 10% and 20%, and the precision in absolute radii is between 5% and 10%. All four systems are W UMa-type binaries with bright or dark spots indicative of mass and energy transfer or surface activity. We estimate the distances and the ages of the systems using the luminosities computed through our analysis, and perform an O – C study for V1128 Tau, which reveals a complex period variation that can be interpreted in terms of mass loss/exchange and either the presence of the third body, or the magnetic activity on one of the components. We conclude that further observations of these systems are needed to deepen our understanding of their nature and variability.
Authors:
; ; ; ; ; ;  [1] ; ; ;  [2]
  1. Department of Astronomy and Space Sciences, Faculty of Science, Ankara University, TR-06100 Tandogan, Ankara (Turkey)
  2. Astronomical Observatory, Volgina 7, 11060 Belgrade (Serbia)
Publication Date:
OSTI Identifier:
22342201
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; ECLIPSE; ENERGY TRANSFER; LUMINOSITY; MASS TRANSFER; RADIAL VELOCITY; SIMULATION; STARS; STELLAR WINDS; SURFACES; VISIBLE RADIATION