J/MNRAS/443/432 Eclipsing binaries in LMC (Muraveva+, 2014)
Eclipsing binary stars in the Large Magellanic Cloud:
results from the EROS-2, OGLE and VMC surveys.
Muraveva T., Clementini G., Maceroni C., Evans C.J., Moretti M.I.,
Cioni M.-R.L., Marquette J.B., Ripepi V., de Grijs R., Groenewegen M.A.T.,
Piatti A.E., van Loon J.T.
<Mon. Not. R. Astron. Soc., 443, 432-445 (2014)>
=2014MNRAS.443..432M 2014MNRAS.443..432M
ADC_Keywords: Magellanic Clouds ; Binaries, eclipsing ; Photometry
Keywords: techniques: photometric - surveys - binaries: eclipsing -
Magellanic Clouds
Abstract:
We present a catalogue of 1768 eclipsing binary stars (EBs) detected
in the Large Magellanic Cloud (LMC) by the second generation of the
EROS survey (hereinafter EROS-2); 493 of them are new discoveries
located in outer regions (out of the central bar) of the LMC. These
sources were originally included in a list of candidate classical
Cepheids (CCs) extracted from the EROS-2 catalogue on the basis of the
period (0.89<PEROS<15.85d) versus luminosity
[13.39≪BEROS><17.82mag] diagram. After visual inspection of the
light curves we reclassified them as eclipsing binaries. They have
blue colours (BEROS-REROS<0.2mag) hence we classed them as hot
eclipsing binaries (HEBs) containing hot massive components: main
sequence (MS) stars or blue giants. We present Ks-band light curves
for 999 binaries from our sample that have a counterpart in the VISTA
near-infrared ESO public survey of the Magellanic Clouds system (VMC).
We provide spectral classifications of 13 HEBs with existing
spectroscopy. We divided our sample into contact-like binaries and
detached/semi-detached systems based on both visual inspection and the
parameters of the Fourier decomposition of the light curves and
analysed the period-luminosity (PL) relations of the contact-like
systems using the REROS and Ks magnitudes at maximum light. The
contact-like binaries in our sample do not follow PL relations. We
analysed the sample of contact binaries from the OGLE III catalogue
and confirmed that PLI and PLK sequences are defined only by
eclipsing binaries containing a red giant component.
Description:
The EROS-2 microlensing survey has monitored about 88deg2 of the
LMC discovering a large number of CCs, RR Lyrae stars, binaries and
long period variables (LPVs), both in the centre and in the outer
regions of the galaxy. The survey was carried out with the Marly 1-m
telescope at ESO, La Silla, from 1996 July to 2003 February.
Observations were performed in two wide passbands, the so-called
REROS band centred close to the IC standard band, and the BEROS
band intermediate between the standard V and R bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 107 493 Identification, main properties and Fourier
parameters of the light curves for the 493 new
Hot Eclipsing Binaries (HEB) in the LMC
tablea2.dat 107 1275 Identification, main properties and Fourier
parameters of the light curve for the 1275 HEBs in
the LMC which were already detected by other surveys
tablea3.dat 96 13 EROS-2 HEBs with existing optical spectroscopy
tablea6.dat 62 999 REROS and Ks magnitudes at maximum light of
EB stars in the LMC from the EROS-2 and VMC data
table4/* . 1768 Individual EROS R and B time series photometry
table5/* . 999 Individual Ks time series photometry
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See also:
J/A+A/566/A43 : EPOCH Project. EROS-2 LMC periodic variables (Kim+, 2014)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- EROS2 EROS-2 identifier, lmNNNNaNNNNN (G1)
13 A1 --- n_Per [*] * indicates star with period re-determined
based on our study of the light curve
16- 23 F8.5 deg RAdeg Right ascension (J2000)
25- 33 F9.5 deg DEdeg Declination (J2000)
35- 44 F10.7 d Per [0.8/21.1] Period P
46- 50 F5.2 mag <Rmag> [13.5/18.1] Average EROS R magnitude
52- 56 F5.2 mag <Bmag> [13.3/17.9] Average EROS B magnitude
58- 66 F9.4 d T0 Epoch of minimum (HJD-2450000)
68- 72 F5.3 mag a0 Fourier parameter a0 (1)
74- 79 F6.3 mag a1 Fourier parameter a1 (1)
81- 86 F6.3 mag a2 Fourier parameter a2 (1)
88- 93 F6.3 mag a3 Fourier parameter a3 (1)
95-100 F6.3 mag a4 Fourier parameter a4 (1)
102-107 F6.3 mag a5 Fourier parameter a5 (1)
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Note (1): model light curve with 6 terms (φ=2πt/P):
A = a0 + a1cos(φ) + a2cos(2φ) + a3cos(3φ)
+ a4 a3cos(4φ) + a5sin(φ)
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- EROS2 EROS-2 identifier, lmNNNNaNNNNN (G1)
15- 22 F8.5 deg RAdeg Right ascension (J2000)
24- 32 F9.5 deg DEdeg Declination (J2000)
34- 41 F8.6 d Per [1.1/5.5] EROS-2 period
43- 50 F8.6 d Per3 [1.1/5.5]?=- OGLE III period from
Graczyk et al. (2011, Cat. J/AcA/61/103)
52- 63 A12 --- AName Alternative name
66- 85 A20 --- SpType MK spectral type
87- 92 A6 --- Note Notes (1)
94- 96 A3 --- Ref Reference (2)
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Note (1): SB1 and SB2 stand for single- and double-lined spectroscopic
binaries, respectively.
Note (2): References as follows:
E06 = Evans et al. 2006A&A...456..623E 2006A&A...456..623E, Cat. J/A+A/456/623
W14 = Walborn et al. 2014A&A...564A..40W 2014A&A...564A..40W, Cat. J/A+A/564/A40
E14 = Evans et al., 2015A&A...574A..13E 2015A&A...574A..13E, Cat. J/A+A/574/A13
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Byte-by-byte Description of file: tablea6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- EROS2 EROS-2 identifier, lmNNNNaNNNNN (G1)
13 A1 --- n_EROS2 [*] * indicates star with period re-determined
based on our study of the light curve
15- 17 A3 --- --- [VMC]
19- 38 A20 --- VMC VMC identifier (JHHMMSS.ss+DDMMSS.s) (1)
40- 48 F9.6 d Per [0.9/21.1] Period
50- 55 F6.3 mag Ksmag Maximum VISTA Ks magnitude
57- 62 F6.3 mag Rmag Maximum EROS R magnitude
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Note (1): VMC catalogue (Vista Magellanic Clouds) available at VSA
(observations completed until 2013 April 1), Lewis, Irwin & Bunclark
(2010, ASP Conf. Ser. Vol 434, P. 91), Cross et al. 2012A&A...548A.119C 2012A&A...548A.119C).
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Byte-by-byte Description of file: table4/*
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Bytes Format Units Label Explanations
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3- 12 F10.5 d HJD Heliocentric Julian date (HJD-2450000)
15- 20 F6.3 mag Rmag ?=99.999 EROS R magnitude
22- 27 F6.3 mag e_Rmag ?=9.999 rms uncertainty on Rmag
30- 35 F6.3 mag Bmag ?=99.999 EROS B magnitude
37- 42 F6.3 mag e_Bmag ?=9.999 rms uncertainty on Bmag
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Byte-by-byte Description of file: table5/*
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Bytes Format Units Label Explanations
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1 A1 --- --- [5]
2- 12 F11.6 d HJD Heliocentric Julian date (HJD-2450000)
14- 20 F7.4 mag Ksmag ?=99.999 Ks magnitude
22- 27 F6.4 mag e_Ksmag ?=9.999 rms uncertainty on Ksmag
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Global notes:
Note (G1):
Sources identified as EROS2-star lmNNN-Na-NNNNN in Simbad.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Mar-2015