J/AJ/150/183 Times of minima for 18 LMC eclipsing binaries (Zasche+, 2015)
Apsidal motion and a light curve solution for 13 LMC eccentric eclipsing
binaries.
Zasche P., Wolf M., Vrastil J., Pilarcik L.
<Astron. J., 150, 183 (2015)>
=2015AJ....150..183Z 2015AJ....150..183Z (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Binaries, eclipsing ; Photometry, CCD
Keywords: binaries: eclipsing - Magellanic Clouds - stars: early-type -
stars: fundamental parameters
Abstract:
New CCD observations for 13 eccentric eclipsing binaries from the
Large Magellanic Cloud were carried out using the Danish 1.54 m
telescope located at the La Silla Observatory in Chile. These systems
were observed for their times of minimum and 56 new minima were
obtained. These are needed for accurate determination of the apsidal
motion. Besides that, in total 436 times of minimum were derived from
the photometric databases OGLE and MACHO. The O - C diagrams of
minimum timings for these B-type binaries were analyzed and the
parameters of the apsidal motion were computed. The light curves of
these systems were fitted using the program PHOEBE, giving the light
curve parameters. We derived for the first time relatively short
periods of the apsidal motion ranging from 21 to 107 years. The system
OGLE-LMC-ECL-07902 was also analyzed using the spectra and radial
velocities, resulting in masses of 6.8 and 4.4 M☉ for the
eclipsing components. For one system (OGLE-LMC-ECL-20112), the
third-body hypothesis was also used to describe the residuals after
subtraction of the apsidal motion, resulting in a period of about 22
years. For several systems an additional third light was also
detected, which makes these systems suspect for triplicity.
Description:
New CCD photometry was obtained at the La Silla Observatory in Chile,
where the 1.54m Danish telescope with the CCD camera and R filter was
used (remotely operated from the Czech Republic). All new times of
minimum are given in Table1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 58 491 List of the minimum timings used for the analysis
table2.dat 89 13 Identification of the analyzed systems
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See also:
II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)
J/A+A/572/A71 : Tlmes of minima for 18 SMC eclipsing binaries (Zasche, 2014)
J/AcA/62/247 : LMC photometric maps from OGLE-III shallow survey
(Ulaczyk+, 2012)
J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Graczyk+, 2011)
J/AJ/134/1963 : MACHO r,b light curves of MC EBs (Faccioli+, 2007)
J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMC (Zaritsky+, 2004)
J/AcA/54/1 : OGLE II SMC eclipsing binaries (Wyrzykowski+, 2004)
J/AcA/53/1 : OGLE eclipsing binaries in LMC (Wyrzykowski+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- --- [OGLE-LMC-ECL-]
14- 18 I05 --- OGLE-III [7902/20498] Eclipsing binary identifier
(OGLE-LMC-ECL-NNNNN)
20- 32 F13.5 d JD Julian Date of the observation
34- 40 F7.5 d e_JD Error in JD
42- 45 A4 --- Type Eclipse type (Prim or Sec)
47- 49 A3 --- Flt [B+R I] Filter used in observation (B+R, I, or R)
51- 58 A8 --- Source Observatory or project source of data (DK154,
MACHO, OGLE II, or OGLE III) (1)
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Note (1): Source/Observatory code defined as below:
DK154 = Danish 1.54-meter telescope at La Silla observatory in Chile;
MACHO = See Faccioli et al. 2007 (cat. J/AJ/134/1963);
OGLE II = See Wyrzykowski et al. 2003 (cat. J/AcA/53/1);
OGLE III = Graczyk et al. 2011 (cat. J/AcA/61/103).
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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- 13 A13 --- --- [OGLE LMC-ECL-]
14- 18 I05 --- OGLE-III [7902/20498] Eclipsing binary identifier
(OGLE LMC-ECL-NNNNN)
20- 30 A11 --- OGLE-II OGLE-II identifier (1)
32- 43 A12 --- MACHO MACHO identifier (NN.NNNN.NNNN)
45- 46 I2 h RAh Hour of Right Ascension (J2000)
48- 49 I2 min RAm Minute of Right Ascension (J2000)
51- 55 F5.2 s RAs Second of Right Ascension (J2000)
57 A1 --- DE- Sign of the Declination (J2000)
58- 59 I2 deg DEd Degree of Declination (J2000)
61- 62 I2 arcmin DEm Arcminute of Declination (J2000)
64- 67 F4.1 arcsec DEs Arcsecond of Declination (J2000)
69- 73 F5.2 mag Imax [14.78/17.83] The I-band maximum magnitude (2)
75- 80 F6.3 mag (V-I)0 [-0.36/0.12]? The (V-I)0 color index (3)
82- 87 F6.3 mag (B-V)0 [-0.265/-0.052]? The (B-V)0 color index (4)
89 A1 --- f_(B-V)0 [e] Flag on (B-V)0 (e=value from Zaritsky et al.
2004 (cat. J/AJ/128/1606)
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Note (1): The full name from the OGLE II survey is OGLE LMC-SCN NNNNNN.
Note (2): Value taken from Graczyk et al. 2011 (cat. J/AcA/61/103).
Note (3): Value taken from Ulaczyk et al. 2012 (cat. J/AcA/62/247).
Note (4): Value derived from the (B-V) and (U-B) indices taken from Massey 2002
(cat. II/236).
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 20-Apr-2016