J/AJ/143/4 Kepler cycle 1 observations of low-mass stars (Harrison+, 2012)
Kepler cycle 1 observations of low-mass stars: new eclipsing binaries, single
star rotation rates, and the nature and frequency of starspots.
Harrison T.E., Coughlin J.L., Ule N.M., Lopez-Morales M.
<Astron. J., 143, 4 (2012)>
=2012AJ....143....4H 2012AJ....143....4H
ADC_Keywords: Stars, variable ; Effective temperatures ; Photometry, ugriz ;
Photometry, DDO
Keywords: binaries: eclipsing - stars: late-type - stars: low-mass - starspots
Abstract:
We have analyzed Kepler light curves for 849 stars with Teff≤5200K
from our Cycle 1 Guest Observer program. We identify six new eclipsing
binaries, one of which has an orbital period of 29.91 days and two of
which are probably W UMa variables. In addition, we identify a
candidate "warm Jupiter" exoplanet. We further examine a subset of
670 sources for variability. Of these objects, 265 stars clearly show
periodic variability that we assign to rotation of the low-mass star.
At the photometric precision level provided by Kepler, 251 of our
objects showed no evidence for variability. We were unable to
determine periods for 154 variable objects. We find that 79% of stars
with Teff≤5200K are variable. The rotation periods we derive for
the periodic variables span the range 0.31days≤Prot≤126.5days.
A considerable number of stars with rotation periods similar to the
solar value show activity levels that are 100 times higher than the
Sun.
Description:
Our sample of objects for observation in Cycle 1 (which ran from 2009
June 20 until 2010 June 23) was selected using the stellar parameters
available in the Kepler Input Catalog (KIC;
Brown et al. 2011, Cat. J/AJ/142/112). With multi-band photometry
(griz, "DDO51" and JHK from Two Micron All Sky Survey, 2MASS), Brown
et al. were able to assign values of Teff, log(g), and AV, and
estimate the metallicity for more than 4 million objects in the Kepler
field of view (FOV).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 46 265 Periodic variables
table3.dat 27 126 Long period variables
table4.dat 27 28 Aperiodic variables
table5.dat 27 251 Non-variable objects
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/AJ/141/78 : Low-mass eclipsing binaries in KIC (Coughlin+, 2011)
http://keplerEBs.villanova.edu/ : Online Kepler eclipsing binary catalog
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler identification number (Cat. V/133)
10- 15 F6.3 mag rmag [15.306/16.965] The r band magnitude
17- 20 I4 K Teff [3621/5197] Effective temperature
22- 31 F10.6 d Per [0.309425/126.582] Rotational period
33- 39 F7.1 ct <Flux> [1815/43000] Mean flux
41- 46 F6.2 ct Amp [3.96/542.2] Amplitude of variation
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Byte-by-byte Description of file: table3.dat table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler identification number (Cat. V/133)
10- 15 F6.3 mag rmag [15/17] The r band magnitude
17- 22 F6.3 mag Ksmag [12.4/15.2] 2MASS Ks band magnitude
24- 27 I4 K Teff [3544/5197] Effective temperature
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 02-Apr-2013