J/ApJ/675/1254 M37 variable stars (Hartman+, 2008)
Deep MMT transit survey of the open cluster M37. II. Variable stars.
Hartman J.D., Gaudi B.S., Holman M.J., McLeod B.A., Stanek K.Z.,
Barranco J.A., Pinsonneault M.H., Kalirai J.S.
<Astrophys. J., 675, 1254-1277 (2008)>
=2008ApJ...675.1254H 2008ApJ...675.1254H
ADC_Keywords: Clusters, open ; Stars, variable ; Binaries, eclipsing
Keywords: binaries: eclipsing -
open clusters and associations: individual (M37) -
stars: fundamental parameters - stars: rotation -
stars: variables: other - surveys
Abstract:
We have conducted a deep (15~<r~<23 ), 20 night survey for transiting
planets in the intermediate-age (∼550Myr) open cluster M37 (NGC 2099)
using the Megacam wide-field mosaic CCD camera on the 6.5m MMT. In
this paper we present a catalog and light curves for 1445 variable
stars; 1430 (99%) of these are new discoveries. We have discovered 20
new eclipsing binaries and 31 new short-period (P<1day) pulsating
stars. The bulk of the variables are most likely rapidly rotating
young low-mass stars, including a substantial number (≳500) that are
members of the cluster. We identify and analyze five particularly
interesting individual variables, including a previously identified
variable that we suggest is probably a hybrid gamma Doradus/delta
Scuti pulsator, two possible quiescent cataclysmic variables, a
detached eclipsing binary (DEB) with at least one gamma Doradus
pulsating component (only the second such variable found in an
eclipsing binary), and a low-mass (MP∼MS∼0.6M☉_ DEB that is a
possible cluster member. A preliminary determination of the physical
parameters for the DEB+gamma Doradus system yields
MP=1.58±0.04M☉, MS=1.58±0.04M☉,
RP=1.39±0.07R☉, and RS=1.38±0.07R☉.
Description:
The observations was presented in Paper I (Cat. J/ApJ/675/1233).
The spectra were obtained on four separate nights between 2007
February 23 and March 12 and were used to measure Teff, [Fe/H],
vsini , and the radial velocity (RV) via cross-correlation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 1454 Variable star catalog
table3.dat 112 29 Suspected variable star catalog
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See also:
J/A+A/381/65 : BVI photometry of NGC 2099 (Nilakshi+, 2002)
J/A+A/412/721 : CCD Δa-photometry of 5 open clusters (Paunzen+, 2003)
J/A+A/483/253 : BV photometry of NGC 2099 variables (Messina+, 2008)
J/ApJ/675/1233 : gri photometry in M37 (NGC 2099) (Hartman+, 2008)
J/ApJ/691/342 : griBVI photometry in M37 (Hartman+, 2009)
Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Running identification number (1)
6- 7 I2 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of the Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 31 I2 --- Chip ? CCD chip number
33- 43 F11.8 d Per ? Period
45- 55 F11.8 d e_Per ? The 1σ error in Per
57- 63 F7.4 mag ? Flux average r band magnitude
65- 70 F6.4 mag rms ? The root-mean-square of r band light curve
72- 77 F6.3 mag gmag ? Paper I (Cat. J/ApJ/675/1233)
g band magnitude
79- 84 F6.3 mag rmag ? Paper I (Cat. J/ApJ/675/1233)
r band magnitude
86- 91 F6.3 mag imag ? Paper I (Cat. J/ApJ/675/1233)
i band magnitude (2)
93- 98 F6.3 mag Bmag ? Kilirai et al. (2001AJ....122.3239K 2001AJ....122.3239K)
B band magnitude
100-105 F6.3 mag Vmag ? Kilirai et al. (2001AJ....122.3239K 2001AJ....122.3239K)
V band magnitude
107-108 I2 --- Type Source type flag (3)
110-112 I3 --- Sel Selection flag (4)
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Note (1): Nomenclature note:
Table 1: <Cl* NGC 2099 HGH VNNNN> in Simbad
Table 3: <Cl* NGC 2099 HGH SNN> in Simbad
Note (2): In table3, the i magnitude is missing, no color term was applied
in transforming from the instrumental r and i magnitudes to the Sloan
2.5m system.
Note (3): A two-bit flag. The first bit denotes whether or not the star is
an eclipsing binary. The second denotes whether or not it shows
pulsations.
Note (4): A three-bit flag. The first bit denotes if the variable was
selected by LS, the second if it was selected by AoV and the third if
it was selected by BLS.
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History:
From electronic version of the journal
References:
Hartman et al., Paper I 2008ApJ...675.1233H 2008ApJ...675.1233H Cat. J/ApJ/675/1233
Hartman et al., Paper III 2009ApJ...691..342H 2009ApJ...691..342H Cat. J/ApJ/691/342
Hartman et al., Paper IV 2009ApJ...695..336H 2009ApJ...695..336H
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Jul-2010