J/MNRAS/459/1060 M67 variable stars from Kepler/K2-Campaign-5 (Gonzalez, 2016)
Variability among stars in the M 67 field from Kepler/K2-Campaign-5
light curves.
Gonzalez G.
<Mon. Not. R. Astron. Soc., 459, 1060-1068 (2016)>
=2016MNRAS.459.1060G 2016MNRAS.459.1060G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, variable
Keywords: techniques: photometric - stars: rotation -
stars: variables: general -
open clusters and associations: individual: M 67
Abstract:
We examine the photometric variability of stars in the M 67 field
using Kepler/K2-Campaign-5 light curves. Variabilities and periods
were determined for 639 stars. The mean photometric period of 28
single Sun-like members stars in M 67 is 23.4±1.2d. This corresponds
to a gyro-age of 3.7±0.3Gyr, assuming the periods can be associated
with rotation. The intrinsic variabilities of the solar analogues are
greater than the Sun's variability, as measure from VIRGO fluxes. We
also find evidence that the single cluster members have a different
distribution of variability than the binary members.
Description:
M 67 was observed continuously between 2015 April 27 and July 10
during the Kepler/K2-Campaign-5 (hereafter, 'Campaign-5 field').
It includes 28 850 long-cadence, 204 short-cadence, and several other
special targets. Several data products for the Campaign-5 field were
released to the public on the NASA Barbara A. Mikulski Archive for
Space Telescopes (MAST) website on 2015 October 30
(https://archive.stsci.edu/k2/). We downloaded tar files containing
all the long-cadence light-curve (CLC) files of the Campaign-5 targets
from the MAST archive. In addition, we downloaded the comprehensive K2
input catalogue (EPIC) for the Campaign-5 field.
We supplemented the NASA K2 data with ground-based data, of which
Nardiello et al. (2016, Cat. J/MNRAS/455/2337) is our primary source.
Nardiello et al. (2016, Cat. J/MNRAS/455/2337) list the positions and
white-light magnitudes for 6905 objects in the M 67 field, but they
only list BVRI magnitudes, proper motions and membership probabilities
for a subset of this large sample. Cross-referencing (using
coordinates) the Campaign-5 input catalogue with the Nardiello et al.
(2016, Cat. J/MNRAS/455/2337) catalogue resulted in 3201 matches. Of
these, 639 have light curves available in the MAST Campaign-5 archive.
This will be the working sample.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 79 639 Various data for the stars in our working sample
--------------------------------------------------------------------------------
See also:
J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)
J/MNRAS/455/2337 : M67 variable stars photometry (Nardiello+, 2016)
https://archive.stsci.edu/k2 : K2 Home page
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- EPIC K2 Input Catalog identifier
11- 16 A6 --- IDX Other identifier
18- 19 A2 --- Class Class (1)
21- 25 A5 --- Cat Category (2)
27- 35 F9.6 d Period Period derived from periodogram
37- 42 F6.2 --- FVI Flux variability index
44- 50 F7.3 mmag Std Standard deviation of flux values
52- 58 F7.3 mmag Stdc Corrected standard deviation
60- 69 F10.6 deg RAdeg Right ascension (J2000.0)
71- 79 F9.6 deg DEdeg Declination (J2000.0)
--------------------------------------------------------------------------------
Note (1): Class as follows:
M = Member
SM = Single member
BM = Binary member
N = Non-member
SN = Single non-member
BN = Binary non-member
U = Unknown membership
Note (2): Category as follows:
EB = eclipsing binary
mult = multiple period
none = no clear variation
rot = rotation modulated
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Jun-2017