... NGC 6791

Based on observation obtained at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii and on observations obtained at San Pedro Mártir 2.1 m telescope (Mexico), and Loiano 1.5 m telescope (Italy).

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... stars

0.75% of stars with planets with period less than 7 days (Butler et al. 2000), and a 10% geometric probability to observe a transit.

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... monitored

A planet candidate was recently reported by Mochejska et al. (2006) in NGC 2158, but the radius of the transiting object is larger than any planet known up to now ($\sim$ $1.7~R_{\rm J}$). The companion is then most likely a very low mass star.

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... detector

www.cfht.hawaii.edu/Instruments/Imaging/CFH12K/

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... telescope

The observations were originally planned at the Asiago Observatory using the 1.82 m telescope + AFOSC. However, a major failure of instrument electronics made it impossible to perform these observations. We obtained four nights of observations at the Loiano Observatory, thanks to the courtesy of the scheduled observer M. Bellazzini and of the Director of Bologna Observatory F. Fusi Pecci.

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... ALFOSC

ALFOSC is owned by the Instituto de Astrofisica de Andalucia (IAA) and operated at the Nordic Optical Telescope under agreement between IAA and the NBIfAFG of the Astronomical Observatory of Copenhagen.

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... routines

IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the NSF.

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... software

http://www.cfht.hawaii.edu/Instruments/Elixir

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... web

http://www.konkoly.hu/staff/kovacs/index.html

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... Encyclopaedia

http://exoplanet.eu/index.php

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