J/A+A/583/A65 Active Kepler stars differential rotation (Reinhold+, 2015)
Rotation, differential rotation, and gyrochronology of active Kepler stars.
Reinhold T., Gizon L.
<Astron. Astrophys. 583, A65 (2015)>
=2015A&A...583A..65R 2015A&A...583A..65R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, ages
Keywords: stars: activity - stars: rotation - starspots
Abstract:
In addition to the discovery of hundreds of exoplanets, the
high-precision photometry from the CoRoT and Kepler satellites has led
to measurements of surface rotation periods for tens of thousands of
stars, which can potentially be used to infer stellar ages via
gyrochronology.
Our main goal is to derive ages of thousands of field stars using
consistent rotation period measurements derived by different methods.
Multiple rotation periods are interpreted as surface differential
rotation (DR). We study the dependence of DR with rotation period and
effective temperature.
We reanalyze a previously studied sample of 24,124 Kepler stars using
different approaches based on the Lomb- Scargle periodogram. Each
quarter (Q1-Q14) is treated individually using a prewhitening
approach. Additionally, the full time series and their different
segments are analyzed.
Description:
Table 2 contains differential rotation (DR) measurements of 12319
stars. The minimum and maximum periods are used to calculate the
relative and absolute shear alpha and dOmega, respectively.
Table 4 contains all period and age measurements. Stellar ages were
derived using different gyrochronology relations. The last column
flags very stable periods and possible evolved stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 46 12319 DR measurements
table4.dat 97 20934 Period and age measurements
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
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 Unique Kepler input catalog number
10- 14 I5 K Teff Effective temperature
16- 20 F5.2 % Rvar Variability range
22- 27 F6.3 d Pmin Minimum period
29- 34 F6.3 d Pmax Maximum period
36- 40 F5.3 --- alpha Relative shear alpha
42- 46 F5.3 rad/d dOmega Absolute shear dOmega
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Unique Kepler input catalog number
10- 14 F5.2 % Rvar Variability range
16- 20 I5 K Teff Effective temperature
22- 27 F6.3 mag (B-V)0 Deredenned B-V colour index, (B-V)-E(B-V)
29- 34 F6.3 mag e_(B-V)0 rms uncertainty on (B-V)0
36- 41 F6.3 d Per Period
43- 48 F6.3 d e_Per Period uncertainty
50- 55 I6 Myr tB07 ?=- Age using B07 relation
57- 62 I6 Myr e_tB07 ?=- rms uncertainty on tB07
64- 69 I6 Myr tMH08 ?=- Age using MH08 relation
71- 76 I6 Myr e_tMH08 ?=- rms uncertainty on tMH08
78- 83 I6 Myr tM09 ?=- Age using M09 relation
85- 90 I6 Myr e_tM09 ?=- rms uncertainty on tM09
92- 97 A6 --- Flag Flags indicating stable periods and evolved
stars (1)
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Note (1): Flags as follows:
ev = star may have evolved off the main sequence
ss = super-stable star
vs = very stable star
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Acknowledgements:
Timo Reinhold, reinhold(at)astro.physik.uni-goettingen.de
Institute for Astrophysics, Goettingen
(End) Timo Reinhold [Goettingen], Patricia Vannier [CDS] 09-Sep-2015