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Title: DEEP, LOW MASS RATIO OVERCONTACT BINARY SYSTEMS. XIII. DZ PISCIUM WITH INTRINSIC LIGHT VARIABILITY

New multi-color photometry for the eclipsing binary DZ Psc was performed in 2011 and 2012 using the 85 cm telescope at the Xinglong Station of the National Astronomical Observatories of China. Using the updated Wilson-Devinney (W-D) code, we deduced two sets of photometric solutions. The overcontact degree is f = 89.7({+-} 1.0)%, identifying DZ Psc as a deep, low mass ratio overcontact binary. The asymmetric light curves (i.e., LC{sub 2} in 2012) were modeled by a hot spot on the primary star. Based on all of the available light minimum times, we discovered that the orbital period of DZ Psc may be undergoing a secular period increase with a cyclic variation. The modulated period and semi-amplitude of this oscillation are P{sub mod} = 11.89({+-} 0.19) yr and A = 0.0064({+-} 0.0006) days, which may be possibly attributed to either cyclic magnetic activity or light-time effect due to the third body. The long-term period increases at a rate of dP/dt=+7.43({+-}0.17) Multiplication-Sign 10{sup -7} days yr{sup -1}, which may be interpreted as conserved mass transfer from the less massive component to the more massive one. With mass transferring, DZ Psc will finally merge into a rapid-rotation single star when J{sub spin}/J{sub orb}more » > 1/3.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. School of Physics and Electronic Information, Huaibei Normal University, 235000 Huaibei, Anhui Province (China)
  2. National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming (China)
  3. Department of Physics, College of Science, Guizhou University, 550025 Guiyang (China)
  4. National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok (Thailand)
Publication Date:
OSTI Identifier:
22122891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 146; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASYMMETRY; COLOR; D CODES; ECLIPSE; HOT SPOTS; MASS TRANSFER; OSCILLATIONS; PHOTOMETRY; STARS; TELESCOPES; VISIBLE RADIATION