J/AJ/163/157 14127 eclipsing binaries in the Galactic Bulge (Hong+, 2022)
Period Changes of 14127 Contact Eclipsing Binaries in the Galactic Bulge.
Hong K., Woo Lee J., Park J.-H., Kim H.-Y., Lee C.-U., Kim H.-W., Kim D.-J.,
Han C.
<Astron. J., 163, 157 (2022)>
=2022AJ....163..157H 2022AJ....163..157H
ADC_Keywords: Stars, double and multiple; Photometry, VRI;
Keywords: Eclipsing binary stars ; Eclipsing binary minima timing method
Abstract:
We present the orbital-period variations of 14127 contact eclipsing
binaries (CEBs) based on the OGLE-III&IV observations in the Galactic
bulge. New times of minimum lights for the CEBs were derived by binary
modeling for the full seasonal light curves, which were made from
survey observations at an interval of 1yr. The orbital-period changes
of the systems were classified based on the statistical inference,
multiple-hypothesis testing error measure, and visual inspection of
the eclipse-timing diagrams. As the results, we identified 13716 CEBs
with a parabola, 307 CEBs with a sinusoid, and 104 CEBs with the two
variations. The period distributions of the inner close binaries and
the outer companions were in the ranges of 0.235-0.990days and
5.0-14.0yr, respectively. In our sample of 13820 CEBs showing a
parabolic variation, the highest decreasing and increasing period
rates were determined to be P=-1.38±0.06x10-5day/yr for
OGLE-BLG-ECL-169991 and P=8.99±0.44x10-6day/yr for
OGLE-BLG-ECL-189805, respectively. The secular period change rates
were distributed almost symmetrically around zero, and most of them
lie within P=±5.0x10-6day/yr.
Description:
For this study, we collected photometric data for CEBs from the
OGLE-III&IV archive data from 2001 to 2015 for the Galactic bulge
fields. The OGLE observations were carried out using the 1.3m Warsaw
telescope at the Las Campanas Observatory in Chile. The telescope is
equipped with an eight-CCD mosaic camera covering a 0.35deg2 field
of view during the OGLE-III and with a 32 chip mosaic camera that
covers a 1.4deg2 field of view for the OGLE-IV. The sky coverages
were nearly 92deg2 for the OGLE-III in 2001-2009 and 182deg2 for
the OGLE-IV in 2010-2015. In this study, only light curves in I-band
were used because the surveys were obtained mostly in I-band,
occasionally in V-band.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 108 13716 *The secular period change rates for the 13716 CEBs
table3.dat 112 307 *Results of sine-curve fit for the 307 CEBs with a
sinusodal period change
table4.dat 128 104 *The fitted parameters for the parabolic plus
sinusoidal ephemeris of 104 Contact EBs
--------------------------------------------------------------------------------
Note on table*.dat: The coordinates, Imag, and V-I are taken from the
OGLE-IV catalog of Soszynski+, 2016AcA....66..405S 2016AcA....66..405S.
--------------------------------------------------------------------------------
See also:
J/A+A/289/871 : YY Eri & AE Phe (Maceroni+, 1994)
J/A+A/311/523 : Photometry of W UMa (Maceroni+, 1996)
J/AcA/56/253 : Period changes of OGLE contact binaries (Kubiak+, 2006)
J/AJ/147/91 : Differential BVR light curves of V407 Peg (Lee+, 2014)
J/MNRAS/448/946 : Kepler eclipse timing variation analyses (Borkovits+, 2015)
J/AJ/150/1 : Eclipse timings 27 eclipsing binaries in the SMC (Hong+, 2015)
J/MNRAS/455/4136 : Kepler triples (Borkovits+, 2016)
J/MNRAS/460/650 : Apsidal motions of 90 SMC eccentric binaries (Hong+, 2016)
J/AcA/66/405 : Galactic bulge eclipsing & ellipsoidal bin. (Soszynski+, 2016)
J/AJ/158/185 : 3 binary systems in the Large Magellanic Cloud (Hong+, 2019)
J/A+A/631/A126 : KIC 9832227 light curves (Kovacs+, 2019)
J/A+A/630/A75 : Six luminous red novae photometry (Pastorello+, 2019)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID OGLE name; OGLE BLG-
12- 13 I2 h RAh [17/18] Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [-] Sign of the Declination (J2000)
25- 26 I2 deg DEd [19/37] Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 41 F6.3 mag Imag [12.5/20.1] Apparent I mag
43- 47 F5.3 mag V-I [0/3.61]? The (V-I) color
51- 59 F9.7 d Per [0.19/1.6] Orbital Period
61- 69 F9.7 d e_Per [0/9e-06] Error in Period
71- 83 F13.5 d HJD [2456999/2457002] Epoch
85- 90 F6.4 d e_HJD [0/0.03] Error in T0
92- 99 E8.2 d/yr dP/dt [-1.38e-05/8.99e-06] Period change rate
101-108 E8.2 d/yr e_dP/dt [3.6e-09/1.96e-06] Error in dP/dt
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID OGLE name; OGLE BLG-
12- 13 I2 h RAh [17/18] Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [-] Sign of the Declination (J2000)
25- 26 I2 deg DEd [22/35] Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 41 F6.3 mag Imag [13.3/19.6] Apparent I mag
43- 47 F5.3 mag V-I [0.4/3.08]? The (V-I) color
49- 57 F9.7 d Per [0.23/0.99] Orbital Period
59- 67 F9.7 d e_Per [1e-07/3e-07] Error of Orbital Period
69- 80 F12.4 d HJD [2456999/2457001] Epoch
82- 87 F6.4 d e_HJD [0.0001/0.002] Error in T0
89- 92 F4.1 yr Per2 [5/14] Outer triple period; This study
94- 96 F3.1 yr e_Per2 [0.1/1.2] Error in P2; This study
98-112 A15 yr Per2* Outer triple period; The others (1)
--------------------------------------------------------------------------------
Note (1): Others as follows:
a = Value taken from Pietrukowicz+, 2017AcA....67..115P 2017AcA....67..115P
b = Value taken from Hajdu+, 2019MNRAS.485.2562H 2019MNRAS.485.2562H
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- ID OGLE name; OGLE BLG-
12- 13 I2 h RAh [17/18] Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [-] Sign of the Declination (J2000)
25- 26 I2 deg DEd [26/35] Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 41 F6.3 mag Imag [13.2/19.6] Apparent I mag
43- 47 F5.3 mag V-I [0.64/2.48]? The (V-I) color
49- 57 F9.7 d Per [0.27/0.96] Orbital Period
59- 67 F9.7 d e_Per [1e-07/2e-06] Error in Period
69- 77 F9.4 d HJD [7000/7001] Epoch; HJD-2450000
79- 84 F6.4 d e_HJD [0.0001/0.002] Error in T0
86- 93 E8.2 d/yr dP/dt [-2.38e-06/2.51e-06] Period change rate
95-101 E7.2 d/yr e_dP/dt [1.38e-07/6.3e-07] Error in dP/dt
103-106 F4.1 yr Per2 [5/10.6] Outer triple period; This study
108-110 F3.1 yr e_Per2 [0.1/0.4] Error in P2; This study
112-128 A17 yr Per2* Outer triple period; The others (1)
--------------------------------------------------------------------------------
Note (1): Others as follows:
a = Value taken from Pietrukowicz+, 2017AcA....67..115P 2017AcA....67..115P
b = Value taken from Hajdu+, 2019MNRAS.485.2562H 2019MNRAS.485.2562H
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 10-May-2022