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Title: A HOLISTIC VIEW OF THE W UMA TYPE TY BOO

Abstract

New CCD four-color light curves of TY Boo made on eight nights over 2010-2011 were analyzed in comparison with historical light curves obtained from 1969 through 2011. The light curves could all be represented by a unique geometry and by wavelength consistent phototometric parameters of a two-spot model on either stellar component. It is confirmed that TY Boo is a shallow W-type contact binary system with a degree of contact factor of f = 7.6% ({+-}0.8). A period investigation based on all available data shows a long-term decrease (dP/dt = -3.65 Multiplication-Sign 10{sup -8} days yr{sup -1}) and an oscillation (P{sub 3} = 58.9 yr, A = 0.0254 days). Without ruling out the presence of a tertiary companion, the weight of evidence points to an active cyclic magnetic activity that causes spot formation rather than an unseen companion. Mass transfer between the components and angular momentum loss are also considered as possible mechanisms.

Authors:
; ;  [1];  [2]
  1. Department of Physics, University of Patras, GR-26500, Patra (Greece)
  2. Department of Astrophysics, Astronomy and Mechanics, Faculty of Physics, Athens University, Panepistimiopolis, GR-15784 Zografos, Athens (Greece)
Publication Date:
OSTI Identifier:
22089810
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 144; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM; ASTRONOMY; ASTROPHYSICS; BINARY STARS; CHARGE-COUPLED DEVICES; COLOR; COMPARATIVE EVALUATIONS; DIAGRAMS; MASS TRANSFER; OSCILLATIONS; PHOTOMETRY; STELLAR ACTIVITY; VISIBLE RADIATION

Citation Formats

Christopoulou, P.-E., Papageorgiou, A., Vasileiadis, T., and Tsantilas, S. A HOLISTIC VIEW OF THE W UMA TYPE TY BOO. United States: N. p., 2012. Web. doi:10.1088/0004-6256/144/5/149.
Christopoulou, P.-E., Papageorgiou, A., Vasileiadis, T., & Tsantilas, S. A HOLISTIC VIEW OF THE W UMA TYPE TY BOO. United States. doi:10.1088/0004-6256/144/5/149.
Christopoulou, P.-E., Papageorgiou, A., Vasileiadis, T., and Tsantilas, S. Thu . "A HOLISTIC VIEW OF THE W UMA TYPE TY BOO". United States. doi:10.1088/0004-6256/144/5/149.
@article{osti_22089810,
title = {A HOLISTIC VIEW OF THE W UMA TYPE TY BOO},
author = {Christopoulou, P.-E. and Papageorgiou, A. and Vasileiadis, T. and Tsantilas, S.},
abstractNote = {New CCD four-color light curves of TY Boo made on eight nights over 2010-2011 were analyzed in comparison with historical light curves obtained from 1969 through 2011. The light curves could all be represented by a unique geometry and by wavelength consistent phototometric parameters of a two-spot model on either stellar component. It is confirmed that TY Boo is a shallow W-type contact binary system with a degree of contact factor of f = 7.6% ({+-}0.8). A period investigation based on all available data shows a long-term decrease (dP/dt = -3.65 Multiplication-Sign 10{sup -8} days yr{sup -1}) and an oscillation (P{sub 3} = 58.9 yr, A = 0.0254 days). Without ruling out the presence of a tertiary companion, the weight of evidence points to an active cyclic magnetic activity that causes spot formation rather than an unseen companion. Mass transfer between the components and angular momentum loss are also considered as possible mechanisms.},
doi = {10.1088/0004-6256/144/5/149},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 5,
volume = 144,
place = {United States},
year = {2012},
month = {11}
}