J/A+A/640/A33 LMC 162 eccentric eclipsing binaries light curve (Zasche+, 2020)
First apsidal motion and light curve analysis of 162 eccentric eclipsing
binaries from LMC.
Zasche P., Wolf M., Kucakova H., Kara J., Merc J., Zejda M., Skarka M.,
Janik J., Kurfurst P.
<Astron. Astrophys. 640, A33 (2020)>
=2020A&A...640A..33Z 2020A&A...640A..33Z (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Binaries, eclipsing ; Photometry
Keywords: binaries: eclipsing - stars: fundamental parameters -
stars: early-type - Magellanic Clouds
Abstract:
We present an extensive study of 162 early-type binary systems located
in the LMC galaxy that show apsidal motion and have never been studied
before. For the ample systems, we performed light curve and apsidal
motion modelling for the first time. These systems have a median
orbital period of 2.2 days and typical periods of the apsidal motion
were derived to be of the order of decades. We identified two
record-breaking systems. The first, OGLE LMC-ECL-22613, shows the
shortest known apsidal motion period among systems with main sequence
components (6.6 years); it contains a third component with an orbital
period of 23 years. The second, OGLE LMC-ECL-17226, is an eccentric
system with the shortest known orbital period (0.9879 days) and with
quite fast apsidal motion period (11 years). Among the studied
systems, 36 new triple-star candidates were identified based on the
additional period variations. This represents more than 20% of all
studied systems, which is in agreement with the statistics of
multiples in our Galaxy. However, the fraction should only be
considered as a lower limit of these early-type stars in the LMC
because of our method of detection, data coverage, and limited
precision of individual times of eclipses.
Description:
For our whole analysis we only used the photometric data. Databases
like OGLE and MACHO were used when available, while for some systems
new photometry from the Danish 1.54 m telescope (hereafter DK154) was
also obtained. The Photometric data from Danish 1.54-m telescope are
presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 73 56 List of studied stars
table.dat 39 26929 Photometric data from Danish 1.54-m telescope
for 162 eccentric eclipsing binaries from LMC
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See also:
J/AcA/66/421 : Eclipsing binaries in the Magellanic System (Pawlak+, 2016)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Star Name of the star, OGLE LMC-ECL-NNNNN
20- 21 I2 h RAh Simbad Right Ascension (J2000.0)
23- 24 I2 min RAm Simbad Right Ascension (J2000.0)
26- 30 F5.2 s RAs Simbad Right Ascension (J2000.0)
32 A1 --- DE- Simbad Declination sign (J2000.0)
33- 34 I2 deg DEd Simbad Declination (J2000.0)
36- 37 I2 arcmin DEm Simbad Declination (J2000.0)
39- 42 F4.1 arcsec DEs Simbad Declination (J2000.0)
44- 52 F9.7 d Per Period (from table A2)
55- 63 F9.7 d e_Per rms uncertainty on Per (from table A2)
65- 68 I4 --- NR ? Number of measurements in R band
70- 73 I4 --- NI ? Number of measurements in I band
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Star Name of the star, OGLE LMC-ECL-NNNNN
20- 30 F11.5 d HJD Heliocentric Julian Date (HJD-2400000)
32- 37 F6.3 mag mag Differential magnitude
39 A1 --- Filter [RI] Photometric filter used
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Acknowledgements:
Petr Zasche, zasche(at)sirrah.troja.mff.cuni.cz
(End) Patricia Vannier [CDS] 17-Jun-2020