Query : 2003A&A...409..959D

2003A&A...409..959D - Astronomy and Astrophysics, volume 409, 959-967 (2003/10-3)

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


Abstract (from CDS):

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=2.347days). 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 (1968ApJ...154..191P). The masses we obtained are 1.80±0.10M and 1.35±0.08M and the radii are 1.60±0.03R and 1.42±0.03R 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 & Gimenez (1991A&AS...87..507C). In the logM-logR diagram both components are located above but close to the ZAMS. It is possible to say from the logTe-logL 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 6.4x108yrs for the system.

Abstract Copyright:

Journal keyword(s): stars: individual: V477 Cygni - stars: binaries: eclipsing - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/409/959): table1.dat>

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 HD 331783 * 20 04 30.3214649448 +31 46 37.147473948   8.78 8.49     F0 11 0
2 HD 331770 PM* 20 04 46.6449025968 +32 02 29.922999936       8.6   G0 20 0
3 V* V477 Cyg SB* 20 05 27.6886714176 +31 58 18.108420780   8.68 8.53     A1V 214 0

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