Deep MMT1 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

Research output: Contribution to journalReview articlepeer-review

107 Scopus citations


We have conducted a deep (15 ≲ r ≲ 23), 20 night survey for transiting planets in the intermediate-age (∼550 Myr) open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD camera on the 6.5 m 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 (≳500) that are members of the cluster. We identify and analyze five particularly interesting individual variables, including a previously identified variable that 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 7 Doradus pulsating component (only the second such variable found in an eclipsing binary), and a low-mass (M P ∼ MS ∼ 0.6 M) DEB that is a possible cluster member. A preliminary determination of the physical parameters for the DEB+γ Doradus system yields MP = 1.58 ± 0.04 M, MS = 1.58 ± 0.04 M, RP = 1.39 ± 0.07 R and RS = 1.38 ± 0.07 R.

Original languageEnglish (US)
Pages (from-to)1254-1277
Number of pages24
JournalAstrophysical Journal
Issue number2
StatePublished - Mar 10 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Binaries: eclipsing
  • Open clusters and associations: individual (M37)
  • Stars: fundamental parameters
  • Stars: rotation
  • Stars: variables: other
  • Surveys


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