J/A+A/465/943 BVI and RV curves of 5 eclipsing binaries (Szalai+, 2007)
Physical parameters and multiplicity of five southern close eclipsing binaries.
Szalai T., Kiss L.L., Meszaros Sz., Vinko J., Csizmadia Sz.
<Astron. Astrophys. 465, 943 (2007)>
=2007A&A...465..943S 2007A&A...465..943S
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, UBVRI
Radial velocities
Keywords: stars: binaries: close - stars: binaries: eclipsing -
stars: binaries: spectroscopic - stars: binaries: general
Abstract:
We detected tertiary components of close binaries from spectroscopy
and light curve modelling, investigated the light-travel time effect
and the possibility of magnetic activity cycles, measured mass ratios
for unstudied systems, and derived absolute parameters. We carried
out new photometric and spectroscopic observations of five bright
close eclipsing binaries, predominantly in the southern skies. We
obtained full Johnson BV light curves, which were modelled with the
Wilson-Devinney code. Radial velocities were measured with the
cross-correlation method using IAU radial velocity standards as
spectral templates. Period changes were studied with the O-C method,
utilising published epochs of minimum light (XY Leo) and ASAS
photometry (VZ Lib). For three objects (DX Tuc, QY Hya, V870 Ara),
absolute parameters have been determined for the first time. We
spectroscopically detected the tertiary components in XY Leo and VZ
Lib and discovered one in QY Hya. For XY Leo we updated the light-time
effect parameters and detected a secondary periodicity of about 5100d
in the O-C diagram that may hint at the existence of short-period
magnetic cycles. A combination of recent photometric data shows that
the orbital period of the tertiary star in VZ Lib is likely to be over
1500d. QY Hya is a semi-detached X-ray active binary in a triple
system with K and M-type components, while V870 Ara is a contact
binary with the third smallest spectroscopic mass ratio for a W UMa
star to date. Being close to the theoretical minimum for contact
binaries, this small mass ratio suggests that V870 Ara has the
potential of constraining evolutionary scenarios of binary mergers.
The inferred distances to these systems are compatible with the
Hipparcos parallaxes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 137 5 Variables list
photjd/* . 9 BVI photometry with HJD
photph/* . 11 BVI photometry with phase
rv/* . 5 Radial velocities with phase
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See also:
V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Variable name
10- 11 I2 h RAh Simbad right ascension (J2000)
13- 14 I2 min RAm Simbad right ascension (J2000)
16- 19 F4.1 s RAs Simbad right ascension (J2000)
21 A1 --- DE- Simbad declination sign (J2000)
22- 23 I2 deg DEd Simbad declination (J2000)
25- 26 I2 arcmin DEm Simbad declination (J2000)
28- 29 I2 arcsec DEs Simbad declination (J2000)
31- 39 F9.7 d Porb Orbital period
41- 53 A13 --- BFile Name of the file with HJD/Bmag light curves
in photjd subdirectory
55- 67 A13 --- VFile Name of the file with HJD/Vmag light curves
in photjd subdirectory
69- 81 A13 --- IFile Name of the file with HJD/Imag light curves
in photjd subdirectory
83- 97 A15 --- BPFile Name of the file with Phase/Bmag light curves
in photph subdirectory
99-113 A15 --- VPFile Name of the file with Phase/Vmag light curves
in photph subdirectory
115-129 A15 --- IPFile Name of the file with Phase/Imag light curves
in photph subdirectory
131-147 A17 --- RVFile Name of the file with Phase/RV curves
in photph subdirectory
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Byte-by-byte Description of file: photjd/*
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Bytes Format Units Label Explanations
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1- 8 F8.5 d HJD-2453180 Heliocentric Julian Date minus 2453180
10- 16 F7.4 mag mag Standard B, V or I Johnson magnitude
18 A1 --- Band [BVI] Photometric band for magnitude
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Byte-by-byte Description of file: photph/*
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Bytes Format Units Label Explanations
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1- 7 F7.5 --- Phase Orbital phase
9- 15 F7.4 mag mag Standard Johnson magnitude or
standard differencial magnitude for XY Leo
17 A1 --- Band [BVI] Photometric band for magnitude
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Byte-by-byte Description of file: rv/*
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Bytes Format Units Label Explanations
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1- 7 F7.5 --- Phase Orbital phase
9- 16 F8.3 km/s RV1 Radial velocity of component 1
18- 26 F9.4 km/s RV2 Radial velocity of component 2
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Acknowledgements:
Tamas Szalai, szaszi(at)titan.physx.u-szeged.hu
(End) Patricia Vannier [CDS] 06-Feb-2007