Cl* NGC 6791 HSG S2 , the SIMBAD biblio

2005AJ....130.2241H - Astron. J., 130, 2241-2251 (2005/November-0)

Pushing the limits of ground-based photometric precision: submillimagnitude time-series photometry of the open cluster NGC 6791.

HARTMAN J.D., STANEK K.Z., GAUDI B.S., HOLMAN M.J. and McLEOD B.A.

Abstract (from CDS):

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 6.5 m 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 submillimagnitude (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 10 new variable stars, including a possible δ Scuti variable with an amplitude of 2%, eight likely W UMa contact binaries, and a possible RS CVn star, and we identified seven suspected low-amplitude variables, including one star with an amplitude of 4 mmag. We comment on the implications of this study for a ground-based survey for transiting planets as small as Neptune.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Eclipsing - Stars: Variables: δ Scuti - Stars: Variables: Other - Techniques: Photometric

Nomenclature: Table 1: Cl* NGC 6791 KR VNNN (Nos V115-V124) added. Table 1: Cl* NGC 6791 HSG SN (Nos S1-S7).

Simbad objects: 18

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