Variability Among Stars in the M 67 Field from Kepler/K2-Campaign-5 Light Curves

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 +/- 1.2 d. This corresponds to a gyro-age of 3.7 +/- 0.3 Gyr, assuming the periods can be associated with rotation. The intrinsic variabilities of the solar analogs 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.

accepted for publication in MNRAS

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• Chemical Abundances of Main-Sequence, Turn-off, Subgiant and red giant Stars from APOGEE spectra I: Signatures of Diffusion in the Open Cluster M67
• Flares in Open Clusters with K2. I. M45 (Pleiades), M44 (Praesepe) and M67
• A Relationship Between Stellar Age and Spot Coverage
• A PSF-based approach to Kepler/K2 data - III. Search for exoplanets and variable stars within the open cluster M 67 (NGC 2682)
• Ultraviolet stellar population of the old open cluster M67 (NGC 2682)
• No "Maunder minimum" candidates in M67: mitigating interstellar contamination of chromospheric emission lines
• New insights into the rotational evolution of near-solar age stars from the open cluster M67
• The K2 M67 Study: Establishing the Limits of Stellar Rotation Period Measurements in M67 with K2 Campaign 5 Data
• A Revised Gyro-Age for M 67 from Kepler/K2-Campaign-5 Light Curves