J/A+A/539/A129 BVRI light curves of 3 eclipsing binaries (Liakos+, 2012)
A fresh insight into the evolutionary status and third body hypothesis of the
eclipsing binaries AD Andromedae, AL Camelopardalis, and V338 Herculis.
Liakos A., Niarchos P., Budding E.
<Astron. Astrophys. 539, A129 (2012)>
=2012A&A...539A.129L 2012A&A...539A.129L
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI ; Spectrophotometry
Keywords: stars: evolution - binaries: close - binaries: eclipsing -
stars: fundamental parameters - starspots
Abstract:
We aim to derive the absolute parameters of the components of AD And,
AL Cam, and V338 Her, interpret their orbital period changes and
discuss their evolutionary status.
New and complete multi-filter light curves of the eclipsing binaries
AD And, AL Cam, and V338 Her were obtained and analysed with modern
methods. Using all reliably observed times of minimum light, we
examined orbital period irregularities using the least squares method.
In addition, we acquired new spectroscopic observations during the
secondary eclipses for AL Cam and V338 Her.
For AL Cam and V338 Her, we derive reliable spectral types for their
primary stars. Statistical checks of orbital period analysis for all
systems are very reassuring in the cases of V338 Her and AD And,
although less so for AL Cam. The LIght-Time Effect (LITE) results are
checked by inclusion of a third light option in the photometric
analyses. Light curve solutions provide the means to calculate the
absolute parameters of the components of the systems and reliably
estimate their present evolutionary status.
AL Cam and V338 Her are confirmed as classical Algols of relatively
low mass in similar configurations. Unlike AL Cam, however, V338 Her
is still transferring matter between its components, raising interest
in the determinability of the evolutionary histories of Algols. AD And
is found to be a detached system in which both close stars are of age
109yr and is probably a "non-classical" young triple, at an
interesting stage of its dynamical evolution.
Description:
The catalogue contains the reduced photometric data in more than one
photometric filters for each system and the spectra for AL Cam and
V338 Her, and the spectroscopic standard stars HIP 21273 and HIP
82020.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 38 5 Star's list
photom.dat 27 6961 Photometric data for AD And, AL Cam, V338 Her
spectros.dat 25 4718 Spectroscopic data for AL Cam, HIP 21273,
HIP 82020, V338 Her
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
11- 12 I2 h RAh Simbad right ascension (J2000)
14- 15 I2 min RAm Simbad right ascension (J2000)
17- 20 F4.1 s RAs Simbad right ascension (J2000)
22 A1 --- DE- Simbad declination sign (J2000)
23- 24 I2 deg DEd Simbad declination (J2000)
26- 27 I2 arcmin DEm Simbad declination (J2000)
29- 30 I2 arcsec DEs Simbad declination (J2000)
32- 35 A4 --- Phot Available photometry in photom.dat file
37- 38 A2 --- Sp Available spectrum in spectros.dat file
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Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
11 A1 --- Filt [BVRI] Filter used
14- 20 F7.4 --- Phase Geometrical phase
22- 27 F6.3 mag dmag Differential magnitude
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Byte-by-byte Description of file: spectros.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
11- 18 F8.3 0.1nm lambda Wavelength
20- 25 F6.4 --- I Normalised intensity
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Acknowledgements:
Alexios Liakos, alliakos(at)phys.uoa.gr
(End) Patricia Vannier [CDS] 21-Feb-2012