J/AJ/158/185 Three binary systems in the Large Magellanic Cloud (Hong+, 2019)
Absolute dimensions and apsidal motions of three binary systems in the Large
Magellanic Cloud.
Hong K., Lee J.W., Kim S.-L., Koo J.-R., Park J.-H., Kim C.-H., Lee C.-U.,
Kim H.-W., Kim D.-J., Han C.
<Astron. J., 158, 185 (2019)>
=2019AJ....158..185H 2019AJ....158..185H
ADC_Keywords: Magellanic Clouds ; Binaries, eclipsing ; Photometry, VRI ;
Radial velocities
Keywords: Eclipsing binary stars
Abstract:
We present the physical properties and apsidal motion elements of three
eccentric eclipsing binaries in the Large Magellanic Cloud. The time-series
photometric observations were carried out for a total of 41 nights between
2018 November and 2019 February using the KMTNet 1.6 m telescopes installed
in South Africa and Australia. The radial velocities of binary components
were measured using about 15 spectra per system collected from the ESO
Science Archive Facility, which were observed with the Very Large Telescope
8.2 m telescope. The effective temperatures of the more massive binary
components were determined to be 19000±500 K for OGLE-LMC-ECL-05797,
17000±500 K for OGLE-LMC-ECL-05861, and 19000±500 K for
OGLE-LMC-ECL-06510 by comparing the observed spectra and the stellar
atmosphere models obtained from the BOSZ spectral library. The absolute
dimensions of each system were derived by analyzing the radial velocity
curves together with the light curves obtained from the KMTNet, OGLE, and
MACHO observations during about three decades. For the apsidal motion
study, new eclipse timings were derived from the KMTNet and survey
photometry. The apsidal motion elements of the three binaries were
determined from both light curve and eclipse timing analysis. The periods
of apsidal motion were 67±2 yr for OGLE-LMC-ECL-05797, 124±6 yr for
OGLE-LMC-ECL-05861, and 39±1 yr for OGLE-LMC-ECL-06510 and their internal
structure constants (ISCs) were log k2,obs=-2.3±0.1, -2.4±0.1, and
-2.1±0.1 in the same order. The observed ISCs of OGLE-LMC-ECL-05797 and
OGLE-LMC-ECL-05861 showed a good match to the theoretical ISC values,
while the value of OGLE- LMC-ECL-06510 was somewhat larger than the
theoretical one.
Description:
The photometric observations of the selected eccentric eclipsing binaries
(EEBs) were carried out for 41 nights from 2018 November to 2019 February
at two sites of the KMTNet (Kim et al. 2016JKAS...49...37K 2016JKAS...49...37K): the South
African Astronomical Observatory (SAAO) in South Africa, and the Siding
Spring Observatory (SSO) in Australia. The VI light curves were obtained
with an exposure time of 120 s per image using the KMTNet 1.6 m telescopes
equipped with a mosaic CCD camera of 18kx18k pixels. The camera has a pixel
scale of 0.4" and a wide field of view of 2°x2°. The spectroscopic
data for the selected EEBs were collected from the ESO Science Archive
Facility (http://archive.eso.org/). The spectra were obtained eight nights
from 2003 November 16 to 23 using the VLT 8.2 m telescope with the
FLAMES/GIRAFFE fiber-fed spectrograph at the ESO-Paranal Observatory in
Chile. The wavelength range from 3960 to 4670 Å and a resolving power
of R=6400 were used. For eclipse timing analyses, the light curves obtained
from the MACHO, OGLE-II, OGLE-III, OGLE-IV, and KMTNet observations during
about three decades were used. In general, the times of minimum light
are obtained from the consecutive observation data of the lower part
of the eclipse.
Objects:
----------------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------------
05 23 34.6 -69 45 22 Large Magellanic Cloud = NAME LMC
----------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 75 3 Basic parameters of three binary systems
table2.dat 51 562 VI photometric observations for the eclipsing
binary LMC5797
table3.dat 51 1238 VI photometric observations for the eclipsing
binary LMC5861
table4.dat 51 1011 VI photometric observations for the eclipsing
binary LMC6510
table5.dat 49 15 RVs of the three eccentric eclipsing binaries
(EEBs)
table8.dat 45 160 List of eclipse timings of three binary systems
--------------------------------------------------------------------------------
See also:
II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001)
J/AcA/53/1 : OGLE eclipsing binaries in LMC (Wyrzykowski+, 2003)
J/AJ/134/1963 : MACHO r,b light curves of MC eclipsing binaries
(Faccioli+, 2007)
J/ApJ/663/249 : LMC eclipsing binaries in the MACHO database (Derekas+, 2007)
J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Graczyk+, 2011)
J/AcA/66/421 : Eclipsing binaries in the Magellanic System (Pawlak+, 2016)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- OGLEIII OGLE-III&IV identifier (OGLE LMC-ECL-NNNNN
in Simbad)
9- 19 A11 --- OGLEII OGLE-II identifier (OGLE LMC-SCNN NNNNNN in
Simbad)
21- 31 A11 --- MACHO MACHO identifier (MACHO FFF.NNNNN.NNNN in
Simbad)
33- 34 I2 h RAh Hour of Right Ascension (J2000) (1)
36- 37 I2 min RAm Minute of Right Ascension (J2000) (1)
39- 43 F5.2 s RAs Second of Right Ascension (J2000) (1)
45 A1 --- DE- Sign of the Declination (J2000) (1)
46- 47 I2 deg DEd Degree of Declination (J2000) (1)
49- 50 I2 arcmin DEm Arcminute of Declination (J2000) (1)
52- 55 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
57- 62 F6.3 mag Vmag [16.806/17.306] V band magnitude (1)
64- 68 F5.3 mag e_Vmag [0.005/0.006] Uncertainty in Vmag (1)
70- 75 F6.3 mag V-I [-0.07/0.058] V-I color index (1)
--------------------------------------------------------------------------------
Note (1): The coordinates, V and V-I, are taken from the OGLE-IV EB catalog of
Pawlak et al. (2016, J/AcA/66/421).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.4 d HJD-V ? Heliocentric Julian Date of V band observation
14- 19 F6.3 mag Vmag [16.771/17.622]? The V band magnitude
21- 25 F5.3 mag e_Vmag [0.005/0.165]? The one σ error in Vmag
27- 38 F12.4 d HJD-I ? Heliocentric Julian Date of I band observation
40- 45 F6.3 mag Imag [16.839/17.66]? The I band magnitude
47- 51 F5.3 mag e_Imag [0.006/0.135]? The one σ error in Imag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.4 d HJD [59.6723/66.8416] Heliocentric Julian Date,
HJD-2452900
9- 11 I3 km/s RV1(5797) [142/441] Primary radial velocity for LMC5797
13- 14 I2 km/s e_RV1(5797) [8/26] Uncertainty in RV1(5797)
16- 18 I3 km/s RV2(5797) [91/459]? Secondary radial velocity for
LMC5797
20- 21 I2 km/s e_RV2(5797) [12/28]? Uncertainty in RV2(5797)
23- 25 I3 km/s RV1(5861) [97/376] Primary radial velocity for LMC5861
27- 28 I2 km/s e_RV1(5861) [7/36] Uncertainty in RV1(5861)
30- 32 I3 km/s RV2(5861) [93/405]? Secondary radial velocity for
LMC6861
34- 35 I2 km/s e_RV2(5861) [10/37]? Uncertainty in RV2(5861)
37- 39 I3 km/s RV1(6510) [165/402]? Primary radial velocity for LMC6510
41- 42 I2 km/s e_RV1(6510) [16/33]? Uncertainty in RV1(6510)
44- 46 I3 km/s RV2(6510) [109/487]? Secondary radial velocity for
LMC6510
48- 49 I2 km/s e_RV2(6510) [18/34]? Uncertainty in RV2(6510)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- OGLEIII OGLE-III&IV identifier (OGLE LMC-ECL-NNNNN
in Simbad)
9- 18 F10.4 d HJD [49005.6/58476.4] Heliocentric Julian Date,
HJD-2400000
20- 25 F6.4 d e_HJD [0.0012/0.028] Uncertainty in HJD
27- 33 F7.1 --- Cycle [-1751/2959.5] Cycle number
35- 36 A2 --- Min [I II] Primary (I) or secondary (II) minimum
38- 45 A8 --- Source Source of observation
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 19-Dec-2019