Up-to-date UBV light and O–C curves analyses of the eclipsing binary V477 Cygni

Free access article

Issue		A&A Volume 409, Number 3, October III 2003


Page(s)		959 - 967
Section		Stellar atmospheres
DOI		http://dx.doi.org/10.1051/0004-6361:20031006

A&A 409, 959-967 (2003)
DOI: 10.1051/0004-6361:20031006

Up-to-date UBV light and O-C curves analyses of the eclipsing binary V477 Cygni

Ö. L. Degirmenci, Ö. Gülmen, C. Sezer, C. Ibanoglu and Ö. Çakirli

Ege University Observatory, 35100 Bornova, Izmir, Turkey
(Received 8 November 2003 / Accepted 24 June 2003)

Abstract
New and complete UBV light curves and times of minimum are presented for the Algol-type eclipsing binary V477 Cygni (Sp. A3 V+F5 V, m_v =8.5, P=2.347 days). The binary orbit of the system is highly eccentric and the system shows an apsidal motion. Using the Wilson-Devinney method, two photometric models, without (MODEL A) and with (MODEL B) third-body light contribution to the total light of the system, are obtained. Period analysis also gives some slender evidence for the unseen third-body in the system with the orbital period of about 157 years. In the MODEL A approximation the apsidal motion period is obtained to be 371 years while it is about 434 years in the MODEL B approximation. The photometric mass ratio ( $q\sim0.75$ ) is in good agreement with the spectroscopic value given by Popper (1968). The masses we obtained are $1.80\pm0.10~M_{\odot}$ and $1.35\pm0.08~M_{\odot}$ and the radii are $1.60\pm0.03~R_{\odot}$ and $1.42\pm0.03~R_{\odot}$ for the primary and secondary components, respectively. Absolute dimensions have been compared with the models using a moderate amount of convective overshooting and mass loss given by Claret & Giménez (1991). In the log M - log R diagram both components are located above but close to the ZAMS. It is possible to say from the log T $_{\rm e}$ - log L diagram that the secondary component is just coming to the main sequence while the primary is slightly evolved from the ZAMS. The theoretical evolutionary models give an age of $6.4\times10^8$ yrs for the system.

Key words: stars: individual: V477 Cygni -- stars: binaries: eclipsing -- stars: fundamental parameters

Offprint request: Ö. L. Degirmenci, omerd@astronomy.sci.ege.edu.tr

SIMBAD Objects
Tables at the CDS

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.