AY Vulpeculae, observations and analysis of a binary with an undermassive secondary

AY Vulpeculae is an Algol-type eclipsig binary with P = 2.4124 days, and V = 11.70 at maximum light. The primary eclipse is very deep (2.2 mag), which makes the system of special interest. Complete light curves in UBV were obtained in 1986 using the 1.0 m reflector at the USNO Flagstaff Station. A r...

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Bibliographic Details
Published in:The Astronomical journal 1991-02, Vol.101 (2), p.616-624
Main Authors: WALKER, R. L, CHAMBLISS, C. R
Format: Article
Language:English
Subjects:
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
ALGORITHMS
Astronomy
Binary and multiple stars
BINARY STARS
BRIGHTNESS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CLASSIFICATION
DATA ANALYSIS
Earth, ocean, space
ECLIPSE
Eclipsing binaries
Exact sciences and technology
MASS
MATHEMATICAL LOGIC
MOTION
OPTICAL PROPERTIES
ORBITS
PHYSICAL PROPERTIES
ROCHE EQUIPOTENTIALS
ROTATION
STARS
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Summary:AY Vulpeculae is an Algol-type eclipsig binary with P = 2.4124 days, and V = 11.70 at maximum light. The primary eclipse is very deep (2.2 mag), which makes the system of special interest. Complete light curves in UBV were obtained in 1986 using the 1.0 m reflector at the USNO Flagstaff Station. A revised ephemeris is presented which shows that the period has increased slightly over the past few decades. The light curves were analyzed using both the WINK method and the SIMPLEX algorithm. AY Vulpeculae is a semidetached system with the secondary filling its Roche lobe. The values derived for r1, r2, and the mass ratio (q) are 0.24, 0.26, and 0.24, respectively. The primary component has the characteristics of a subgiant of spectral clas F0, while the secondary is a K-type subgiant and is decidedly undermassive. (Author)
ISSN:0004-6256
1538-3881
DOI:10.1086/115710