J/ApJ/790/L23 Solar analogs and twins rotation by Kepler (do Nascimento+, 2014)
Rotation periods and ages of solar analogs and solar twins revealed by the
Kepler mission.
do Nascimento J.-D.Jr, Garcia R.A., Mathur S., Anthony F., Barnes S.A.,
Meibom S., da Costa J.S., Castro M., Salabert D., Ceillier T.
<Astrophys. J., 790, L23 (2014)>
=2014ApJ...790L..23D 2014ApJ...790L..23D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Effective temperatures ; Stars, ages ;
Stars, masses
Keywords: stars: evolution - stars: fundamental parameters - stars: rotation
stars: solar-type - Sun: fundamental parameters
Abstract:
A new sample of solar analogs and twin candidates has been constructed
and studied, paying particular attention to their light curves from
NASA's Kepler mission. This Letter aims to assess their evolutionary
status, derive their rotation and ages, and identify those which are
solar analogs or solar twin candidates. We separate out the subgiants
that compose a large fraction of the asteroseismic sample, and which
show an increase in the average rotation period as the stars ascend
the subgiant branch. The rotation periods of the dwarfs, ranging from
6 to 30 days and averaging 19 days, allow us to assess their
individual evolutionary states on the main sequence and to derive
their ages using gyrochronology. These ages are found to be in
agreement with a correlation coefficient of r = 0.79 with independent
asteroseismic ages, where available. As a result of this
investigation, we are able to identify 34 stars as solar analogs and
22 of them as solar twin candidates.
Description:
Our sample of 75 stars consists of a seismic sample of 38 from Chaplin
et al. (2014, J/ApJS/210/1), 35 additional stars selected from the
Kepler Input Catalog (KIC), and 16 Cyg A and B. We selected 38
well-studied stars from the asteroseismic data with fundamental
properties, including ages, estimated by Chaplin et al. (2014,
J/ApJS/210/1), and with Teff and log g as close as possible to the
Sun's value (5200 K < Teff < 6060 K and 3.63 < log g < 4.40). This
seismic sample allows a direct comparison between gyro- and
seismic-ages for a subset of eight stars. These seismic samples were
observed in short cadence for one month each in survey mode. Stellar
properties for these stars have been estimated using two global
asteroseismic parameters and complementary photometric and
spectroscopic observations as described by Chaplin et al. (2014,
J/ApJS/210/1). The median final quoted uncertainties for the full
Chaplin et al. (2014, J/ApJS/210/1) sample were approximately 0.020
dex in log g and 150 K in Teff.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 151 75 Rotation of solar analogs and twin candidates
revealed by Kepler
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJ/749/152 : Asteroseismic analysis of 22 solar-type stars (Mathur+, 2012)
J/MNRAS/423/122 : Abundances of 93 solar-type Kepler targets (Bruntt+, 2012)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/ApJS/211/2 : Revised stellar properties of Q1-16 Kepler targets
(Huber+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Num Index number
4- 11 I8 --- KIC Kepler Input Catalog (Cat. V/133)
13- 18 F6.3 mag VMag KIC Absolute V band magnitude
20- 23 I4 K Teff Effective Temperature
25- 27 I3 K E_Teff Upper limit on Teff
29- 31 I3 K e_Teff Lower limit on Teff
33 A1 --- r_Teff Teff source flag (1)
35- 39 F5.3 [cm/s2] log(g) Log surface gravity
41- 45 F5.3 [cm/s2] E_log(g) Upper limit on log(g)
47- 51 F5.3 [cm/s2] e_log(g) Lower limit on log(g)
53 A1 --- r_log(g) Log(g) source flag (1)
55- 58 F4.1 d Period Rotational Period from this paper
60- 63 F4.2 d e_Period Error in Period
65 A1 --- n_Period Determination note on Period (2)
67- 70 F4.1 Gyr Age Seismic or Isocrone Age
72- 74 F3.1 Gyr E_Age Upper limit on Age
76- 78 F3.1 Gyr e_Age Lower limit on Age
80 I1 --- r_Age Source flag on Age (2)
82- 85 F4.2 Gyr GyroAge ? Gyro age from this paper
87- 89 F3.1 Gyr e_GyroAge ? Error in GyroAge
91- 95 F5.3 10-3 F8hr ? The 8-hour flicker in parts/trillion
97-101 F5.3 10-3 e_F8hr ? Error in F8hr
103-106 F4.2 Msun MassNS Non_standard model mass from this paper
108-111 F4.2 Msun E_MassNS Upper limit on MassNS
113-116 F4.2 Msun e_MassNS Lower limit on MassNS
118-121 F4.2 Msun MassS Standard model mass
123-126 F4.2 Msun MassH Huber et al. (2014, J/ApJS/211/2) model mass
128-133 F6.3 [-] [Fe/H] Metallicity
135-139 F5.3 [-] E_[Fe/H] Upper limit on [Fe/H]
141-145 F5.3 [-] e_[Fe/H] Lower limit on [Fe/H]
147-151 A5 --- Status Star identification (3)
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Note (1): Reference as follows :
1 = This paper;
3 = Chaplin et al. (2014, J/ApJS/210/1);
4 = Huber et al. (2014, J/ApJS/211/2);
5 = Metcalfe et al. (2012ApJ...748L..10M 2012ApJ...748L..10M).
Note (2): Note as follows :
6 = half period detected;
7 = twice period detected;
8 = low modulation;
9 = bad correction.
Note (3): Status as follows :
AN = Solar analog
Cyg A = Cygnus A
Cyg B = Cygnus B
MDW = Not explained in the paper
SBG = Subgiant
TC = Solar twin candidate
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 16-Mar-2017