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Title: BI VULPECULAE: A SIAMESE TWIN WITH TWO VERY SIMILAR COOL STARS IN SHALLOW CONTACT

BI Vul is a cool eclipsing binary star (Sp. = K3 V) with a short period of 0.2518 days. The first charge-coupled device (CCD) light curves of the binary in the BVRI obtained on 2012 August 21 are presented and are analyzed using the Wilson-Devinney code. It is discovered that BI Vul is a marginal contact binary system (f = 8.7%) that contains two very similar cool components (q = 1.037). Both the marginal contact configuration and the extremely high mass ratio suggest that it is presently evolving into contact with little mass transfer between the components and it is at the beginning stage of contact evolution. By using all available times of minimum light, the variations in the orbital period are investigated for the first time. We find that the observed – calculated (O – C) curve of BI Vul shows a cyclic change with a period of 10.8 yr and an amplitude of 0.0057 days, while it undergoes a downward parabolic variation. The cyclic oscillation is analyzed for the light-travel time effect that arises from the gravitational influence of a possible third stellar object. The mass and orbital separation of the third body are estimated as M {submore » 3} ∼ 0.30 M {sub ☉} and ∼4.9 AU, respectively. The downward parabolic change reveals a long-term period decrease at a rate of P-dot = -9.5 x 10{sup -8} days yr{sup –1}. The period decrease may be caused by angular momentum loss via magnetic stellar wind and/or it is only a part of a long-period (longer than 32 yr) cyclic variation, which may reveal the presence of another stellar companion in a wider orbit. These observational properties indicate that the formation of the Siamese twin is driven by magnetic braking and the third stellar companion should play an important role by removing angular momentum from the central binary.« less
Authors:
; ; ; ; ; ; ;  [1] ;  [2]
  1. Yunnan Observatories, Chinese Academy of Sciences (CAS), P. O. Box 110, 650011 Kunming (China)
  2. School of Space Science and Physics, Shandong University, Weihai, 264209 Weihai (China)
Publication Date:
OSTI Identifier:
22273271
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 209; Journal Issue: 1; 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; ASTRONOMY; ASTROPHYSICS; BINARY STARS; CHARGE-COUPLED DEVICES; ECLIPSE; MASS TRANSFER; ORBITS; OSCILLATIONS; STAR EVOLUTION; STELLAR WINDS; VARIATIONS; VISIBLE RADIATION