J/AJ/128/1761 HATNET variability survey (Hartman+, 2004)
HATNET variability survey in the high stellar density "Kepler field" with
millimagnitude image subtraction photometry.
Hartman J.D., Bakos G., Stanek K.Z., Noyes R.W.
<Astron. J., 128, 1761-1783 (2004)>
=2004AJ....128.1761H 2004AJ....128.1761H
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, Cousins ;
Photometry, infrared
Keywords: binaries: eclipsing - catalogs - Cepheids - δ Scuti -
stars: variables: other - techniques: photometric
Abstract:
The Hungarian-made Automated Telescope Network (HATnet) is an ongoing
project to detect transiting extrasolar planets using small-aperture
(11cm diameter) robotic telescopes. In this paper, we present the
results from using image subtraction photometry to reduce a crowded
stellar field observed with one of the HATnet telescopes (HAT-5). This
field was chosen to overlap with the planned Kepler mission. We
obtained I-band light curves for 98,000 objects in a 67 square degree
field of view centered at J2000 (α,δ)=(19h44m00.0s,
+37°32'00.0"), near the Galactic plane in the constellations
Cygnus and Lyra. These observations include 788 exposures of 5' length
over 30-days. For the brightest stars (I∼8.0) we achieved a precision
of 3.5mmag, falling to 0.1mag at the faint end (I∼14). From these
light curves we identify 1617 variable stars, of which 1439 are newly
discovered.
Description:
The data were obtained in 2003 June and July using the HAT-5 telescope
located at the Fred Lawrence Whipple Observatory (FLWO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 126 1617 HAT Catalog of "Kepler Field" Variables
lc/* . 1617 *Light Curves
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Note on lc/*: from http://cfa-www.harvard.edu/~gbakos/HAT/LC/199/
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See also:
http://cfa-www.harvard.edu/~gbakos/HAT/LC/199/ : Catalog and Light Curves
II/250 : Combined General Catalogue of Variable Stars (Samus+ 2004)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [HAT199]
7- 11 I05 --- HAT199 The HAT identification
13- 14 I2 h RAh Hour of right ascension (J2000)
16- 17 I2 min RAm Minute of right ascension (J2000)
19- 23 F5.2 s RAs Second of right ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd 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 Icmag Reference Cousins I-band magnitude
43- 48 F6.3 mag Jmag ? 2MASS (Cat. II/246) J-band magnitude
50- 55 F6.3 mag Hmag ? 2MASS (Cat. II/246) H-band magnitude
57- 62 F6.3 mag Kmag ? 2MASS (Cat. II/246) K-band magnitude
64- 74 F11.6 --- USNO ? The USNO-B1 identification (Cat. I/284)
76- 78 A3 --- Class Variable classification (1)
80- 85 F6.3 mag Icmin Minimum I-band magnitude measurement
87- 92 F6.3 mag Icmax Maximum I-band magnitude measurement
94-100 F7.4 d Per ? Period
102-110 A9 --- GCVS The GCVS identification (2)
112-118 A7 --- Vclass The GCVS classification (2)
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Note (1): The variable classification is defined as follows:
LPV = Long-period variable
ECL = Eclipsing variable
PUL = Pulsating variable
MIS = Miscelleneous variable
Note (2): GCVS = Combined General Catalogue of Variable Stars (Kholopov
et al. 1998, see Cat. II/250).
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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3- 13 F11.6 d JD-2450000 Date/time of observation
17- 24 F8.5 mag Imag Cousins magnitude
29- 35 F7.5 mag e_Imag Mean error on Imag
37- 39 I3 --- Nf Number of frames
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Apr-2005