Optical Photometry and Spectroscopy of the Suspected ``Cool Algol'' AV Delphini: Determination of the Physical Properties

Astronomy and Astrophysics – Astronomy

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Stars: Binaries: Eclipsing, Stars: Binaries: Spectroscopic, Stars: Fundamental Parameters, Stars: Individual: Constellation Name: Av Delphini

Scientific paper

We present new spectroscopic and BVRI photometric observations of the double-lined eclipsing binary AV Del (period=3.85 days) conducted over six observing seasons. A detailed radial velocity and light-curve analysis of the optical data shows the system to be most likely semidetached, with the less massive and cooler star filling its Roche lobe. The system is probably a member of the rare class of ``cool Algol'' systems, which are distinguished from the ``classical'' Algol systems in that the mass-gaining component is also a late-type star rather than a B- or A-type star. By combining the spectroscopic and photometric analyses, we derive accurate absolute masses for the components of M1=1.453+/-0.028Msolar and M2=0.705+/-0.014Msolar and radii of R1=2.632+/-0.030Rsolar and R2=4.233+/-0.060Rsolar, as well as effective temperatures of 6000+/-200 and 4275+/-150 K for the primary and secondary, respectively. There are no obvious signs of activity (spottedness) in the optical light curve of the binary.

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