J/ApJ/663/249 LMC eclipsing binaries in the MACHO database (Derekas+, 2007)
Eclipsing binaries in the MACHO database: new periods and classifications for
3031 systems in the Large Magellanic Cloud.
Derekas A., Kiss L.L., Bedding T.R.
<Astrophys. J., 663, 249-257 (2007)>
=2007ApJ...663..249D 2007ApJ...663..249D
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Photometry
Keywords: binaries: eclipsing - galaxies: individual (Large Magellanic Cloud) -
stars: statistics - stars: variables: other
Abstract:
Eclipsing binaries offer a unique opportunity to determine fundamental
physical parameters of stars by using the constraints on the geometry
of the systems. Here we present a reanalysis of publicly available
two-color observations of about 6800 stars in the Large Magellanic
Cloud obtained by the MACHO Project between 1992 and 2000 and
classified as eclipsing variables. Of these, fewer than half are
genuine eclipsing binaries. We determined new periods and classified
the stars, 3031 in total, using the Fourier parameters of the phased
light curves.
Description:
The MACHO observations were carried out between 1992 and 2000 with the
1.27m Great Melbourne Telescope at Mount Stromlo Observatory,
Australia.
The telescope was equipped with a specifically designed camera, which
gave a 0.5deg2 field of view. The observations were obtained in two
nonstandard bandpasses simultaneously: a 440-590nm MACHO "blue"
filter, and a 590-780nm MACHO "red" filter.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 3031 New periods and classifications
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See also:
II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001)
J/ApJ/542/257 : MACHO LMC first-overtone RR Lyrae (Alcock+, 2000)
J/MNRAS/337/519 : M giants in MACHO, DENIS and ISOGAL (Glass+, 2002)
J/ApJ/598/597 : Fundamental-mode RR Lyrae frequency analysis (Alcock+, 2003)
J/AJ/127/334 : MACHO LMC first-overtone RR Lyrae variables (Alcock+, 2004)
J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- MACHO Identification number (FFF.NNNNN.NNNN)
15- 16 I2 h RAh Hour of right ascension (J2000)
18- 19 I2 min RAm Minute of right ascension (J2000)
21- 26 F6.3 s RAs Second of right ascension (J2000)
28 A1 --- DE- Sign of the declination (J2000)
29- 30 I2 deg DEd Degree of declination (J2000)
32- 33 I2 arcmin DEm Arcminute of declination (J2000)
35- 39 F5.2 arcsec DEs Arcsecond of declination (J2000)
41- 46 F6.3 mag Vmag The V-band magnitude
48- 53 F6.3 mag V-R The (V-R) color index
55- 64 F10.6 d Per ? Period
66- 75 F10.4 d T0-2400000 ? Epoch of eclipse (Julian Date 2400000+)
77- 82 A6 --- Type Binary type (1)
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Note (1): Binary types ad follows:
EC = Contact
ESD = Semidetached
ED = Detached
(*) = A foreground object
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Aug-2009