J/MNRAS/463/3513 M67 Kepler/K2-Campaign-5 variable stars (Gonzalez, 2016)
A revised gyro-age for M67 from Kepler/K2-Campaign-5 light curves.
Gonzalez G.
<Mon. Not. R. Astron. Soc., 463, 3513-3519 (2016)>
=2016MNRAS.463.3513G 2016MNRAS.463.3513G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, variable
Keywords: techniques: photometric - stars: variables: general -
open clusters and associations: individual: M67
Abstract:
We revisit the photometric variability of stars in the M67 field using
Kepler/K2-Campaign-5 light curves. In our previous work (Gonzalez,
2016, Cat. J/MNRAS/459/1060), we limited the search area around M67 to
that of a recent ground-based study. In the present work, we expand
the search area and apply a more rigorous period-finding algorithm to
determine the rotation periods of 98 main-sequence cluster members
from the same data. In addition, we derive periods of 40 stars from
the K2SC detrended light curves. We determine the mean period of
single sun-like main-sequence cluster members to be 29.6±0.6d.
Assuming the periods correspond to stellar rotation, the corresponding
mean gyrochronological (gyro-) age is 5.4±0.2Gyr.
Description:
Using Kepler/K2-Campaign-5 light curves, we have per- formed an
improved period analysis of M 67 member stars compared to our earlier
similar study (Paper I, Gonzalez, 2016, Cat. J/MNRAS/459/1060). We
found that some of the period estimates in Paper I were not true
rotation periods. Our new analysis includes stars observed by Kepler
over a wider area than we explored in Paper I, but, because of our
more restrictive criteria in the present work, actually yields fewer
rotation period determinations from the same data. In addition, we
derived periods from a second K2 database containing detrended light
curves. The new rotation periods are in excellent agreement with those
of B16, where our samples overlap.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 98 Derived periods from the PDCSAP_FLUX values
table2.dat 68 40 Derived periods from the K2SC light curves
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See also:
J/MNRAS/459/1060 : M67 variable stars from Kepler/K2-Campaign-5 (Gonzalez 2016)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- EPIC K2 Input Catalog identifier
11- 15 F5.2 mag Vmag Visual magnitude
17- 20 F4.2 mag B-V B-V color index
22- 25 F4.1 d Per Period
27- 29 F3.1 d e_Per Period error
31- 35 F5.2 --- FVI Flux variability index
37- 41 F5.2 mmag Std Standard deviation of flux values
43- 47 F5.2 mmag Stdc Corrected standard deviation
49- 58 F10.6 deg RAdeg Rigth ascension (J2000.0)
60- 68 F9.6 deg DEdeg Declination (J2000.0)
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History:
From electronic version of the journal
References:
Gonzalez, Paper I 2016MNRAS.459.1060G 2016MNRAS.459.1060G, Cat. J/MNRAS/459/1060
(End) Patricia Vannier [CDS] 14-May-2018