Deep MMT1 transit survey of the open cluster M37. I. Observations and cluster parameters

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

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We have conducted a deep (15 ≲ r ≲ 23), 20 night survey for transiting planets in the intermediate-age open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD camera on the 6.5 m MMT. In this paper we describe the observations and data reduction procedures for the survey and analyze the stellar content and dynamical state of the cluster. By combining high-resolution spectroscopy with existing BVICKS and new gri color-magnitude diagrams, we determine the fundamental cluster parameters: t = 485 ± 28 Myr without overshooting (t = 550 ± 30 Myr with overshooting), E( B- V) = 0.227 ± 0.038, (m - M)V = 11.57 ± 0.13, and [M/H] = +0.045 ± 0.044, which are in good agreement with, although more precise than, previous measurements. We determine the mass function down to 0.3 M and use this to estimate the total cluster mass of 3640 ± 170 M.

Original languageEnglish (US)
Pages (from-to)1233-1253
Number of pages21
JournalAstrophysical Journal
Issue number2
StatePublished - Mar 10 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Open clusters and associations: individual (M37)
  • Planetary systems
  • Stars: fundamental parameters
  • Stars: luminosity function, mass function
  • Surveys


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