Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..616w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, Feb. 1991, p. 616-624. Research supported by Kutztown University.
Astronomy and Astrophysics
Astronomy
2
Eclipsing Binary Stars, F Stars, K Stars, Stellar Mass, Light Curve, Stellar Orbits, Stellar Spectra, Subgiant Stars
Scientific paper
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.
Chambliss Carlson R.
Walker Raymond L.
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