J/AcA/56/253 Period changes of OGLE contact binaries (Kubiak+, 2006)
Period changes of contact binaries in OGLE database.
Kubiak M., Udalski A., Szymanski M.K.
<Acta Astron., 56, 253-265 (2006)>
=2006AcA....56..253K 2006AcA....56..253K
ADC_Keywords: Binaries, eclipsing ; Photometry
Keywords: binaries: close - binaries: eclipsing
Abstract:
Presented are results of determination of secular period changes for
569 contact binaries from the OGLE database with periods shorter than
about one day and observations spanning 14 observing seasons. The
statistically significant rates of secular changes found for 134 stars
are distributed nearly symmetrically around zero with a half-width of
the distribution equal to about 3.5x10-7d/yr. The remaining rates
are confined within the error distribution with dispersion about
2.3x10-7d/yr. The largest rates of period change that have been
found are of the order of 5x10-6d/yr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 679 Contact binaries in OGLE database used for
determination of secular period changes
table2.dat 64 569 Time derivatives of periods determined by the
method of variance minimization
table3.dat 52 272 Results of the "average O-C diagram" method
lc/* . 569 Individual light curves
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See also:
I/244 : OGLE General Catalog of Stars. I. (Szymanski+ 1996)
II/213 : OGLE Galactic Bulge periodic variables (Udalski+ 1996)
V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)
V/120 : Catalog of early-type contact binaries (Bondarenko+, 1996)
J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)
J/AcA/51/259 : Contact binaries in OGLE-I database (Szymanski+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Field Field
6- 11 I6 --- Star Star number in the field
14- 21 F8.6 d Per Period
25- 29 F5.2 mag Imag Observed brightness in I band
32- 35 F4.2 mag V-I ?=9.99 Observed V-I colour index
39- 40 I2 h RAh Right ascension (J2000)
42- 43 I2 min RAm Right ascension (J2000)
45- 49 F5.2 s RAs Right ascension (J2000)
51 A1 --- DE- Declination sign (J2000)
52- 53 I2 deg DEd Declination (J2000)
55- 56 I2 arcmin DEm Declination (J2000)
58- 61 F4.1 arcsec DEs Declination (J2000)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Field Field
6- 11 I6 --- Star Star number in the field
13- 21 F9.7 d P Best value of the period
24- 32 E9.4 d/yr dP/dt Rate of period change
35- 38 I4 --- Nobs Number of observations
40- 44 F5.3 --- Fst F-statistics
46- 51 F6.1 --- Pst P-statistics
54- 64 A11 --- FileName Name of the light curve in "lc" subdirectory
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Field Field
6- 11 I6 --- Star Star number in the field
14- 21 F8.6 d P Period
25- 28 I4 --- Nobs Number of observations
32- 40 E9.4 d/yr dP/dt Rate of period change determined from the
quadratic term in the O -C diagram
45- 52 E8.4 d/yr p.e. Formal error of the solution
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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3- 12 F10.5 d HJD-2448000 Heliocentric Julian date, HJD-2448000
16- 21 F6.3 mag dImag I-band brightness minus mean
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History:
Copied at ftp://ftp.astrouw.edu.pl/acta/2006/kub_253
(End) Patricia Vannier [CDS] 08-Jun-2007