PERIOD CHANGES AND FOUR-COLOR LIGHT CURVES OF ACTIVE CONTACT BINARY VW BOOTIS

Journal Article · Sun May 15 00:00:00 EDT 2011 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/141/5/147· OSTI ID:21583150

Liu, L; Qian, S -B; Zhu, L -Y; He, J -J

The secured four-color light curves of VW Boo were analyzed with the 2003 version of the Wilson-Devinney code. It is confirmed that VW Boo is a shallow W-type contact binary system with a degree of contact factor f = 10.8%({+-} 0.5%). Two dark spots were found on the massive cool component this time. They cause an unequal depth of the two maxima. A period investigation based on all available visual, photographic, CCD, and photoelectric data shows that the period of the system includes a long-term decrease (dP/dt = -1.454 x 10{sup -7} days yr{sup -1}) and an oscillation (A{sub 3} = 0.0059 days; T{sub 3} = 25.96 years). These may be caused by mass transfer, angular momentum loss, and cyclic magnetic activity.

• OSTI ID: 21583150
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 5; Other Information: DOI: 10.1088/0004-6256/141/5/147; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANGULAR MOMENTUM
CHARGE-COUPLED DEVICES
COLOR
MASS TRANSFER
PHOTOGRAPHY
STAR EVOLUTION
STARS
EVOLUTION
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
SEMICONDUCTOR DEVICES