A Catalog of Periodic Variables in Open Clusters M35 and NGC 2158

Abstract

We present a catalog of 1,143 periodic variables, compiled from our image-subtracted photometric analysis of the K2 Campaign-0 super stamp. This super stamp is centered on the open clusters M35 and NGC 2158. Approximately 46% of our periodic variables were previously unreported. Of the catalog variables, we find that 331 are members of M35 and 56 are members of NGC 2158 ($P_{\mathrm{m}}>0.5$). Our catalog contains two new transiting exoplanet candidates, both of which orbit field stars. The smaller planet candidate has a radius of $0.35\pm 0.04{\mathrm{R}}_{\mathrm{J}}$ and orbits a K dwarf ($K_{\mathrm{p}}=15.4$ mag) with a transit depth of 2.9 millimag. The larger planet candidate has a radius of $0.72\pm 0.02{\mathrm{R}}_{\mathrm{J}}$ and orbits a late G type star ($K_{\mathrm{p}}=15.7$ mag) with a transit depth of 2.2 millimag. The larger planet candidate maybe an unresolved binary or a false alarm. Our catalog includes 44 eclipsing binaries, including ten new detections. Of the eclipsing binaries, one is an M35 member and five are NGC 2158 members. Our catalog contains a total of 1,097 non-transiting variable stars, including a field $\delta$ Cepheid exhibiting double mode pulsations, 561 rotational variables, and 251 pulsating variables (primarily $\gamma$ Doradus and $\delta$ Scuti types). The periods of our catalog sources range between 43 minutes to 24 days. The known ages of our reported cluster variables will facilitate investigations of a variety of stellar evolutionary processes.

34 pages, 24 figures

References in corpus (17)

• The NumPy array: a structure for efficient numerical computation
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• The effect of red noise on planetary transit detection
• A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster
• Calibrating Gyrochronology using Kepler Asteroseismic targets
• Long Term Evolution of Close Planets Including the Effects of Secular Interactions
• Deep MMT Transit Survey of the Open Cluster M37 III: Stellar Rotation at 550 Myr
• The Monitor project: Rotation of low-mass stars in the open cluster NGC 2547
• Variable stars in two open clusters within the Kepler 2-Campaign-0 field: M 35 and NGC 2158
• Non-linear modelling of beat Cepheids: Resonant and non-resonant models
• An Isolated Microlens Observed from K2, Spitzer and Earth
• Messier 35 (NGC2168) DANCe I. Membership, proper motions and multi-wavelength photometry
• Image Subtraction Reduction of Open Clusters M35 & NGC 2158 In The K2 Campaign-0 Super-Stamp
• Beat Cepheids as Probes of Stellar and Galactic Metallicity: The New AGS Abundances
• Ultralow-amplitude RR Lyrae Stars in M4

Cited by in corpus (1)

• A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- II. Search for exoplanets in open clusters of the southern ecliptic hemisphere and their frequency