Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aj....130..234m&link_type=abstract
The Astronomical Journal, Volume 130, Issue 1, pp. 234-245.
Astronomy and Astrophysics
Astronomy
4
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.
Mader Jeff A.
Marschall Laurence A.
Rizvi Akbar
Torres Guillermo
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