J/AJ/134/766 BEST variable stars in LRc1 field (Karoff+, 2007)
Identification of variable stars in COROT's first main observing field (LRc1).
Karoff C., Rauer H., Erikson A., Voss H., Kabath P., Wiese T., Deleuil M.,
Moutou C., Meunier J.C., Deeg H.
<Astron. J., 134, 766-777 (2007)>
=2007AJ....134..766K 2007AJ....134..766K
ADC_Keywords: Surveys ; Stars, variable ; Photometry
Keywords: binaries: eclipsing - methods: data analysis - stars: variables: other
Abstract:
The COROT space mission will monitor several target fields for up to
150 days to perform asteroseismology and to search for extrasolar
planets by photometric transits. Variable stars in the target fields
are important objects for additional scientific studies but can also
disturb the search for planetary transits. A variability
characterization of the target fields prior to COROT observations is
therefore important for two reasons: to find interesting variable
stars to monitor further and to make an analysis of the impact of the
variable stars on detecting extrasolar planet transits with COROT.
The Berlin Exoplanet Search Telescope (BEST) is a small wide-angle
telescope dedicated to high-precision photometry. It has observed a
9deg2 field of view centered at (RA,DE)=(19:00:00.0+00:01:55.2)
(J2000.0) over 98 nights to search for variable stars in the
surroundings of the first long-run target field (LRc1) of the COROT
space mission. In this data set we identified 92 periodic variable
stars, 86 of which are new discoveries and 6 of which are known from
the General Catalogue of Variable Stars (GCVS). For five of the GCVS
stars, variability could not be confirmed. Forty-three of the 92
detected periodic variable stars are identified as eclipsing binaries.
We have evaluated the completeness of our survey for eclipsing
binaries by comparing it to the expected fraction of eclipsing
binaries based on Hipparcos observations. From this evaluation we show
that the BEST data set presented here has a completeness of 20%-30%
for periods longer than 1 day and is complete relative to Hipparcos
for short-period binaries.
Description:
We present the results from a monitoring program of the COROT field
LRc1 in the Galactic center direction centered at
(RA,DE)=(19:00:00.0+00:01:55.2) (J2000.0) obtained from 2005 June 6
to September 7. The data set consists of a total of 35 nights of
observations spread out over 98 nights in summer 2005.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 65 86 Periodic variable stars in the field
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See also:
B/corot : CoRoT observation log (CoRoT, 2009)
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
J/AJ/134/1560 : BEST periodic variable stars in IR01 field (Kabath+, 2007)
J/AJ/136/654 : BEST periodic variable stars in LRa1 field (Kabath+, 2008)
J/AJ/137/3911 : BEST periodic variable stars in LRc2 field (Kabath+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- [KRE2007] Running identification number
5- 18 A14 --- USNO The USNO-A2.0 identification number
20- 21 I2 h RAh Hour of Right Ascension (J2000)
23- 24 I2 min RAm Minute of Right Ascension (J2000)
26- 30 F5.2 s RAs Second of of Right Ascension (J2000)
32 A1 --- DE- Sign of the Declination (J2000)
33- 34 I2 deg DEd Degree of Declination (J2000)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000)
39- 42 F4.1 arcsec DEs Arcsecond of Declination (J2000)
44- 50 F7.3 d Per Period
52- 56 F5.2 mag Rmag Mean magnitude (1)
58- 61 F4.2 mag Amp Amplitude of periodic variability (2)
63- 65 A3 --- VType Variability type (3)
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Note (1): The observations were made without a filter in front of the CCD
(the spectral response of the CCD corresponds to a wide R bandpass).
Note (2): Corresponding to the deeper dip for eclipsing binaries.
Note (3): Variability type as follows:
PPV = periodic pulsating variable
EB = eclipsing binary
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 04-Aug-2009