J/ApJ/765/L41 Asteroseismic classification of KIC objects (Stello+, 2013)
Asteroseismic classification of stellar populations among 13,000 red giants
observed by Kepler.
Stello D., Huber D., Bedding T.R., Benomar O., Bildsten L., Elsworth Y.P.,
Gilliland R.L., Mosser B., Paxton B., White T.R.
<Astrophys. J., 765, L41 (2013)>
=2013ApJ...765L..41S 2013ApJ...765L..41S
ADC_Keywords: Stars, giant ; Photometry ; Stars, variable ; Stars, masses
Keywords: asteroseismology; stars: evolution; stars: fundamental parameters;
stars: interiors; stars: oscillations; techniques: photometric
Abstract:
Of the more than 150000 targets followed by the Kepler Mission, about
10% were selected as red giants. Due to their high scientific value,
in particular for Galaxy population studies and stellar structure and
evolution, their Kepler light curves were made public in late 2011.
More than 13000 (over 85%) of these stars show intrinsic flux
variability caused by solar-like oscillations making them ideal for
large-scale asteroseismic investigations. We automatically extracted
individual frequencies and measured the period spacings of the dipole
modes in nearly every red giant. These measurements naturally classify
the stars into various populations, such as the red giant branch, the
low-mass (M/M☉≲1.8) helium-core-burning red clump, and the
higher-mass (M/M☉≳1.8) secondary clump. The period spacings
also reveal that a large fraction of the stars show rotationally
induced frequency splittings. This sample of stars will undoubtedly
provide an extremely valuable source for studying the stellar
population in the direction of the Kepler field, in particular when
combined with complementary spectroscopic surveys.
Description:
Our initial data set comprised photometric time series of 15261 stars
observed by Kepler from 2009 May 2 to 2011 March 14 (observing
quarters 0-8) in the long-cadence mode (δt=29.4244 minutes),
with a median time span of just below two years. Most of these stars
are expected to be red giants.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig4.dat 37 3326 Median ΔP for each star versus its Δν
(based on 0.2uHz smoothing of the frequency spectra)
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJS/211/2 : Revised stellar properties of Q1-16 Kepler data (Huber+, 2014)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/ApJS/199/30 : Effective temperature scale for KIC (Pinsonneault+, 2012)
J/ApJ/753/90 : K5 & later type Kepler stars stellar parameters (Mann+, 2012)
J/ApJ/752/72 : Correlation metallicity/eclipse depth (Dodson-Robinson, 2012)
J/A+A/543/A160 : Normalized spectra of 82 Kepler red giants (Thygesen+, 2012)
J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)
J/A+A/531/A124 : Visibilities of stellar oscillation modes (Ballot+, 2011)
J/A+A/528/A121 : Normalized spectra of 20 red giants (Bruntt,+, 2011)
J/A+A/525/A131 : Solar-like oscillations in Kepler red giants (Hekker+, 2011)
J/MNRAS/412/1210 : Kepler asteroseismic targets (Molenda-Zakowicz+, 2011)
J/ApJ/718/L97 : Early asteroseismic results from Kepler (Van Grootel+, 2010)
http://archive.stsci.edu/kepler/ : Kepler STSci archive
Byte-by-byte Description of file: fig4.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler Input Catalog identifier
10- 15 F6.3 uHz Dnu [3/16.6] Large frequency separation of consecutive
overtone modes of the same degree
17- 23 F7.3 s [8.1/319.5] Median pairwise period spacing between
adjacent dipole modes (see section 2.3)
25- 29 F5.3 Msun M [0.4/3.5] Stellar mass
31- 37 A7 --- Class Asteroseismic classification: RGB (1869 objects),
CLUMP (1231 objects), or UNKNOWN (226 objects))
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Nov-2014