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

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

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..959d&link_type=abstract

Astronomy and Astrophysics, v.409, p.959-967 (2003)

Astronomy and Astrophysics

Astrophysics

6

Stars: Individual: V477 Cygni, Stars: Binaries: Eclipsing, Stars: Fundamental Parameters

Scientific paper

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, mv =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 ~ 0.75) is in good agreement with the spectroscopic value given by Popper (\cite{Popper1968}). The masses we obtained are 1.80+/-0.10 Msun and 1.35+/-0.08 Msun and the radii are 1.60+/-0.03 Rsun and 1.42+/-0.03 Rsun 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 (\cite{Claret1991}). 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 Te - 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*E8 yrs for the system.
Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.73.128.5) or via http:/ / cdsweb.u-strasbg.fr /cgi-bin/qcat?J/A+A/409/959

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