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J/MNRAS/463/1831    M67 Kepler/K2 variable stars             (Nardiello+, 2016)

A PSF-based approach to Kepler/K2 data. III. Search for exoplanets and variable stars within the open cluster M 67 (NGC 2682). Nardiello D., Libralato M., Bedin L.R., Piotto G., Borsato L., Granata V., Malavolta L., Nascimbeni V. <Mon. Not. R. Astron. Soc., 463, 1831-1843 (2016)> =2016MNRAS.463.1831N (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, UBVRI ; Photometry, infrared ; Proper motions Keywords: techniques: image processing - techniques: photometric - binaries: general - stars: variables: general - open clusters and associations: individual: M 67 Abstract: In the third paper of this series we continue the exploitation of Kepler/K2 data in dense stellar fields using our PSF-based method. This work is focused on a ∼720-arcmin2 region centred on the Solar-metallicity and Solar-age open cluster M 67. We extracted light curves for all detectable sources in the Kepler channels 13 and 14, adopting our technique based on the usage of a high-angular-resolution input catalogue and target-neighbour subtraction. We detrended light curves for systematic errors, and searched for variables and exoplanets using several tools. We found 451 variables, of which 299 are new detection. Three planetary candidates were detected by our pipeline in this field. Raw and detrended light curves, catalogues, and K2 stacked images used in this work will be released to the community. Description: The K2 observations were performed during C5. The data set includes 3620 usable long-cadence observations, that spanned over 74.82d (2015 April 27-July 10). The bulk of M 67 falls in between the two KEPLERCAM channels 13 (Ch13) and 14 (Ch14) of module 6. In this work we focus exclusively on the point sources monitored by K2/C5 on these two channels. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file m67-ch13.dat 124 2952 Input catalog for Ch13 m67-ch14.dat 124 1215 Input catalog for Ch14 var-ch13.dat 136 319 Variable stars in K2/C5/M67 field (Ch13) var-ch14.dat 136 170 Variable stars in K2/C5/M67 field (Ch14) m67_13.fits 2880 1684 K2 Stacked image for ch13 m67_14.fits 2880 1684 K2 Stacked image for ch14
See also: J/MNRAS/463/1780 : Exoplanet candidates in Praesepe (M 44) (Libralato+, 2016) J/MNRAS/455/2337 : M67 variable stars photometry (Nardiello+, 2016) Byte-by-byte Description of file: m67-ch13.dat m67-ch14.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right ascension (J2000) 11- 19 F9.6 deg DEdeg Declination (J2000) 21- 28 F8.5 mag Kpmag Instrumental Kepler magnitude 30- 37 F8.4 mag Bmag ?=-99.999 Calibrated B magnitude 39- 46 F8.4 mag Vmag ?=-99.999 Calibrated V magnitude 48- 55 F8.4 mag Rmag ?=-99.999 Calibrated R magnitude 57- 64 F8.4 mag Imag ?=-99.999 Calibrated I magnitude 66- 72 F7.3 mag J2mag ?=-99.999 Calibrated J_2MASS magnitude 74- 80 F7.3 mag H2mag ?=-99.999 Calibrated H_2MASS magnitude 82- 88 F7.3 mag K2mag ?=-99.999 Calibrated K_2MASS magnitude 90- 96 I7 --- ID ID number of the star (1) 98-106 F9.4 mas/yr pmRA ?=-99999 Proper motion along RA, pmRA*cosDE (1) 108-116 F9.4 mas/yr pmDEc ?=-999.99 Proper motion laong DE (1) 118-124 F7.4 --- Pmemb Membership probability (1)
Note (1): From Nardiello et al. (2016, Cat. J/MNRAS/455/2337).
Byte-by-byte Description of file: var-ch13.dat var-ch14.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right ascension (J2000) 11- 19 F9.6 deg DEdeg Declination (J2000) 21- 32 F12.9 d Per Period (1) 34- 41 F8.5 mag Kpmag Instrumental Kepler magnitude 43- 50 F8.4 mag Bmag ?=-99.999 Calibrated B magnitude 52- 59 F8.4 mag Vmag ?=-99.999 Calibrated V magnitude 61- 68 F8.4 mag Rmag ?=-99.999 Calibrated R magnitude 70- 77 F8.4 mag Imag ?=-99.999 Calibrated I magnitude 79- 85 F7.3 mag J2mag ?=-99.999 Calibrated J_2MASS magnitude 87- 93 F7.3 mag H2mag ?=-99.999 Calibrated H_2MASS magnitude 95-101 F7.3 mag K2mag ?=-99.999 Calibrated K_2MASS magnitude 103-106 I4 --- ID ID number of the star (1) 108-116 F9.4 mas/yr pmRA ?=-999.99 Proper motion along RA, pmRA*cosDE (2) 118-126 F9.4 mas/yr pmDE ?=-999.99 Proper motion along DE (2) 128-134 F7.4 --- Pmemb ?=-1 Membership probability (2) 136 I1 --- ClasK2 Light-curve classification flag (3)
Note (1): If Period = 74.82 d, the star could be either irregular/long-period variable or the observed variability is due to a systematic effect Note (2): From Nardiello et al. (2016, Cat. J/MNRAS/455/2337) Note (3): Light-curve classification flag as follows: 1 = candidate variable 2 = "difficult-interpretation" object 3 = possible blend
History: Copied at http://web.oapd.inaf.it/bedin/files/Kepler-K2/C5/Module-06/ References: Libralato et al., Paper I 2016MNRAS.456.1137L Libralato et al., Paper II 2016MNRAS.463.1780L, Cat. J/MNRAS/463/1780
(End) Patricia Vannier [CDS] 04-May-2018
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