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

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115710· OSTI ID:5914175

Walker, R L; Chambliss, C R ^[1]

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1. Naval Observatory, Flagstaff, AZ (USA) Kutztown Univ., PA (USA)

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 class F0, while the secondary is a K-type subgiant and is decidedly undermassive. 24 refs.

• OSTI ID: 5914175
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
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MASS
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OPTICAL PROPERTIES
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ROCHE EQUIPOTENTIALS
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