Pushing the Limits of Ground-based Photometric Precision: Submillimagnitude Time-Series Photometry of the Open Cluster NGC 6791 | Zendy

J. D. Hartman | Zendy; K. Z. Stanek | Zendy; B. Scott Gaudi | Zendy; Matthew J. Holman | Zendy; B. A. McLeod | Zendy

Open Access

Pushing the Limits of Ground-based Photometric Precision: Submillimagnitude Time-Series Photometry of the Open Cluster NGC 6791

Author(s) -

J. D. Hartman,

K. Z. Stanek,

B. Scott Gaudi,

Matthew J. Holman,

B. A. McLeod

Publication year - 2005

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/462405

Subject(s) - physics , photometry (optics) , open cluster , stars , astrophysics , planet , astronomy , variable star , amplitude , telescope , optics

We present the results from a three night, time-series study of the opencluster NGC 6791 using the Megacam wide-field mosaic CCD camera on the 6.5m MMTtelescope. The aim of this study was to demonstrate the ability to obtain veryhigh precision photometry for a large number of stars. We achieved better than1% precision for more than 8000 stars with 14.3 < R < 20.1 andsub-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 variablestars, including a possible delta-Scuti variable with an amplitude of 2%, 6likely W UMa contact binaries, and a possible RS CVn star, and we identified 5suspected low-amplitude variables, including one star with an amplitude of 3mmag. We comment on the implications of this study for a ground-based surveyfor transiting planets as small as Neptune.Comment: 12 pages, 7 figures, 1 table. Submitted to the A

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