J/A+A/409/959 UBV light curves of V477 Cyg (Degirmenci+, 2003)
Up-to-date UBV light and O-C curves analyses of the eclipsing binary V477 Cygni
Degirmenci O.L., Gulmen O., Sezer C., Ibanoglu C., Cakirli O.
<Astron. Astrophys. 409, 959 (2003)>
=2003A&A...409..959D 2003A&A...409..959D
ADC_Keywords: Binaries, eclipsing ; Photometry, UBV
Keywords: stars: individual: V477 Cygni - stars: binaries: eclipsing -
stars: fundamental parameters
Abstract:
New and complete UBV light curves and times of minimum are presented
for the Algol type eclipsing binary V477 Cygni (Sp. A3V+F5V,
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 1968ApJ...154..191P). The masses we obtained are 1.80±0.10 solar
masses and 1.35±0.08 solar masses and the radii are 1.60±0.03
solar radii and 1.42±0.03 solar radii 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 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.
Description:
The photoelectric light curves of V477 Cyg presented here were
obtained during June August 1998. All measurements were made in the U,
B and V passbands of the Johnson system on 16 nights. The individual
measurements were obtained differentially with respect to BD+31 3924.
BD+31 3926 was observed as a check star.
Objects:
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RA (2000) DE Designation(s)
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20 05 27.7 +31 58 18 V477 Cyg
20 04 30.3 +31 46 37 BD+31 3924
20 04 46.6 +32 02 30 BD+31 3926
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 672 Instrumental differential U, B, V magnitudes
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJDU ? Julian Date for U magnitude
14- 19 F6.3 mag DUmag ? Differential U magnitude V477 Cyg - BD+31 3924
21- 32 F12.4 d HJDB ? Julian Date for B magnitude
34- 39 F6.3 mag DBmag ? Differential B magnitude V477 Cyg - BD+31 3924
41- 52 F12.4 d HJDV Julian Date for V magnitude
54- 59 F6.3 mag DVmag Differential V magnitude V477 Cyg - BD+31 3924
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Acknowledgements: Omer Lutfi Degirmenci
(End) Patricia Bauer [CDS] 02-Oct-2003