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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 (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 ( 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) : 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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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