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arXiv:astro-ph/0504487 (astro-ph)
[Submitted on 21 Apr 2005]

Title:Pushing the Limits of Ground-Based Photometric Precision -- Sub-Millimagnitude Time-Series Photometry of the Open Cluster NGC 6791

Authors:J.D. Hartman, K.Z. Stanek, B.S. Gaudi, M.J. Holman, B.A. McLeod
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Abstract: We present the results from a three night, time-series study of the open cluster NGC 6791 using the Megacam wide-field mosaic CCD camera on the 6.5m MMT telescope. The aim of this study was to demonstrate the ability to obtain very high precision photometry for a large number of stars. We achieved better than 1% precision for more than 8000 stars with 14.3 < R < 20.1 and sub-millimagnitude (as low as 0.36 mmag) precision for over 300 stars with 14.6 < R < 16.3 in the field of this cluster. We also discovered 8 new variable stars, including a possible delta-Scuti variable with an amplitude of 2%, 6 likely W UMa contact binaries, and a possible RS CVn star, and we identified 5 suspected low-amplitude variables, including one star with an amplitude of 3 mmag. We comment on the implications of this study for a ground-based survey for transiting planets as small as Neptune.
Comments: 12 pages, 7 figures, 1 table. Submitted to the AJ
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504487
  (or arXiv:astro-ph/0504487v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504487
Journal reference: Astron.J.130:2241-2251,2005
Related DOI: https://doi.org/10.1086/462405

Submission history

From: Joel Hartman [view email]
[v1] Thu, 21 Apr 2005 21:10:16 UTC (197 KB)
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