Deep MMT Transit Survey of the Open Cluster M37 II: Variable Stars

J. D. Hartman; B. S. Gaudi; M. J. Holman; B. A. McLeod; K. Z. Stanek; J. A. Barranco; M. H. Pinsonneault; J. S. Kalirai

doi:10.1086/527460

paper

Deep MMT Transit Survey of the Open Cluster M37 II: Variable Stars

arXiv:0709.3484 · doi:10.1086/527460

Abstract

We have conducted a deep ($15 \la r \la 23$), 20 night survey for transiting planets in the intermediate age ( $\sim 550 Myr$ ) open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD camera on the 6.5m Multiple Mirror Telescope (MMT). In this paper we present a catalog and light curves for 1445 variable stars; 1430 (99%) of these are new discoveries. We have discovered 20 new eclipsing binaries and 31 new short period ( $P < 1 day$ ) pulsating stars. The bulk of the variables are most likely rapidly rotating young low-mass stars, including a substantial number ($\ga 500$) that are members of the cluster. We identify and analyze five particularly interesting individual variables including a previously identified variable which we suggest is probably a hybrid $γ$ Doradus/ $δ$ Scuti pulsator, two possible quiescent cataclysmic variables, a detached eclipsing binary (DEB) with at least one $γ$ Doradus pulsating component (only the second such variable found in an eclipsing binary), and a low mass ( $M_{P} \sim M_{S} \sim 0.6 M_{⊙}$ ) DEB that is a possible cluster member. A preliminary determination of the physical parameters for the DEB+ $γ$ Doradus system yields $M_{P} = 1.58 \pm 0.04 M_{⊙}$ , $M_{S} = 1.58 \pm 0.04 M_{⊙}$ , $R_{P} = 1.39 \pm 0.07 R_{⊙}$ and $R_{S} = 1.38 \pm 0.07 R_{⊙}$ .

arXiv comment73 pages, 30 figures, 2 tables. Accepted for publication in ApJ. Version with high resolution figures available at http://www.cfa.harvard.edu/~jhartman/M37_2.ps.gz

Deep MMT Transit Survey of the Open Cluster M37 II: Variable Stars

Abstract

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