J/MNRAS/465/4678 9380 contact binaries from CRTS VSC (Marsh+, 2017)
Characterization of 9380 contact binaries from the
CRTS Variable Sources Catalogue.
Marsh F.M., Prince T.A., Mahabal A.A., Bellm E.C., Drake A.J.,
Djorgovski S.G.
<Mon. Not. R. Astron. Soc., 465, 4678-4689 (2017)>
=2017MNRAS.465.4678M 2017MNRAS.465.4678M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, SDSS
Keywords: surveys - binaries: eclipsing - stars: magnetic field
Abstract:
We construct a sample of 9380 contact binaries (W UMa systems) by
using the Catalina Real-Time Transient Survey Variables Sources
Catalogue. By measuring brightness change rates, light-curve
statistics, and temperatures for this sample, we improve the
understanding of contact binary light-curve characteristics, and
luminosity variability on decadal time-scales. We show that binaries
with convective outer envelopes have a different distribution of
light-curve amplitudes and magnitude differences between eclipse
minima than binaries with radiative outer envelopes. We find that more
than 2000 binaries exhibit a linear change in mean brightness over the
8-yr timespan of observations with at least 3σ significance. We
note that 25.9 per cent of binaries with convective outer envelopes
exhibit a significant change in brightness, while only 10.5 per cent
of radiative binaries exhibit a significant change in brightness. In
205 binaries (2.2 per cent), we find that a sinusoid model better
describes the luminosity trend within the 8-yr observation timespan.
For these binaries, we report the amplitudes and periods (as estimated
using observed half-periods) of this sinusoidal brightness variation
and discuss possible mechanisms driving the variation.
Description:
In this study, we use data from two separate surveys: (1) we use CRTS
data spanning 8yr, which allows us for the variation in the
luminosity of each system on a decadal time-scale to be measured, and
(2) we use SDSS data which provide multiband photometric measurements
taken within the timespan of a few minutes, allowing the temperature
of each binary to be measured.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 341 9380 Sample of 9380 contact binaries
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See also:
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Index [0/9379] Number associated with a binary
system
6- 25 A20 --- CSS Catalina Surveys Identifier
CSS_JHHMMSS.s+DDMMSS
27- 39 I13 --- nID Catalina Surveys Numerical Identifier
41- 42 I2 h RAh Right ascension (J2000)
44- 45 I2 min RAm Right ascension (J2000)
47- 51 F5.2 s RAs Right ascension (J2000)
53 A1 --- DE- Delcination sign (J2000)
54- 55 I2 deg DEd Delcination (J2000)
57- 58 I2 arcmin DEm Delcination (J2000)
60- 63 F4.1 arcsec DEs Delcination (J2000)
65- 67 I3 --- Nobs Number of CRTS observations of the source
69- 73 F5.2 mag Vmag Mean CSS magnitude of the source
75- 83 F9.7 d Per Orbital period of the source
85- 89 F5.3 mag Amp Amplitude of the source light-curve
91- 95 F5.3 mag e_Amp rms uncertainty on Amp
97-102 F6.3 mag Dmin Difference between the eclipse minima of the
source light-curve
104-108 F5.3 mag e_Dmin rms uncertainty on Dmin
110-115 F6.3 mag Dmax Difference between the out-of-eclipse maxima
of the source light-curve
117-121 F5.3 mag e_Dmax rms uncertainty on Dmax
123-130 E8.5 mag/yr slope Linear slope of the harmonic fit residuals
132-138 F7.5 mag/yr e_slope rms uncertainty on slope
140-144 F5.3 --- MaxPower Maximum Lomb-Scargle power of the harmonic
fit residuals
146-150 F5.3 --- 3sPower Lomb-Scargle power which corresponds to a
3-sigma detection of a periodic signal in
the harmonic fit residuals
152-158 F7.1 d Pres Period of the strongest signal in the
harmonic fit residuals
160-165 F6.3 mag sinAmp Amplitude of the strongest periodic signal
in the harmonic fit residuals
167-172 F6.2 --- maxBIC Maximum Bayesian Information Criterion
achieved by the strongest periodic signal in
the harmonic fit residuals
174-180 F7.1 K Teff Effective temperature of the source as
determined by SDSS (g-r) color
182-188 F7.1 K e_Teff rms uncertainty on Teff
190-193 F4.2 mag Eu Extinction to the source in the SDSS u band
195-198 F4.2 mag Eg Extinction to the source in the SDSS g band
200-203 F4.2 mag Er Extinction to the source in the SDSS r band
205-208 F4.2 mag Ei Extinction to the source in the SDSS i band
210-213 F4.2 mag e_Eu rms uncertainty on Eu
215-218 F4.2 mag e_Eg rms uncertainty on Eg
220-223 F4.2 mag e_Er rms uncertainty on Er
225-228 F4.2 mag e_Ei rms uncertainty on Ei
230-234 F5.2 mag Euc Extinction-corrected SDSS u band measurement
236-240 F5.2 mag Eug Extinction-corrected SDSS g band measurement
242-246 F5.2 mag Eur Extinction-corrected SDSS r band measurement
248-252 F5.2 mag Eui Extinction-corrected SDSS i band measurement
254-261 F8.1 pc Dist Estimated distance to the source
(error is approximately 10%)
263-267 F5.3 mag E(B-V) B-V extinction to the source
269-273 F5.3 mag e_E(B-V) rms uncertainty on E(B-V)
275-280 F6.3 mag umag u-band measurement as reported by SDSS
282-287 F6.3 mag e_umag rms uncertainty in umag
289-294 F6.3 mag gmag g-band measurement as reported by SDSS
296-300 F5.3 mag e_gmag rms uncertainty in gmag
302-307 F6.3 mag rmag r-band measurement as reported by SDSS
309-313 F5.3 mag e_rmag rms uncertainty in rmag
315-320 F6.3 mag imag i-band measurement as reported by SDSS
322-327 F6.3 mag e_imag rms uncertainty in imag
329-334 F6.3 mag zmag z-band measurement as reported by SDSS
336-341 F6.3 mag e_zmag rms uncertainty on zmag
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Aug-2019