2005AJ....130.2241H

Query : 2005AJ....130.2241H

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.

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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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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl* NGC 6791 KR V115 V* 19 19 50.29 +37 58 32.9     20.70     ~ 2 0
2 Cl* NGC 6791 KR V116 V* 19 20 10.22 +37 43 12.2           ~ 3 0
3 Cl* NGC 6791 KR V117 EB* 19 20 36.3505975512 +37 39 56.764740096         16.76 ~ 11 0
4 Cl* NGC 6791 HSG S1 V*? 19 20 49.2562795490 +37 45 11.849709876           ~ 2 0
5 Cl* NGC 6791 HSG S2 * 19 20 50.2866201288 +37 40 06.972381084           ~ 5 0
6 Cl* NGC 6791 HSG S3 * 19 20 50.9903457288 +37 43 59.351793240           ~ 5 0
7 Cl* NGC 6791 KR V118 EB* 19 20 50.9936570757 +37 39 04.128184213   18.43 17.68   16.67 ~ 3 0
8 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
9 Cl* NGC 6791 HSG S4 V*? 19 21 06.06 +37 44 43.7           ~ 1 0
10 Cl* NGC 6791 KR V119 EB* 19 21 07.0666927152 +37 54 59.007005892     18.15   16.82 ~ 5 0
11 Cl* NGC 6791 HSG S5 V*? 19 21 07.13 +37 48 39.5           ~ 1 0
12 Cl* NGC 6791 KR V120 V* 19 21 10.54 +37 40 22.3           ~ 2 0
13 Cl* NGC 6791 HSG S6 V*? 19 21 15.5198120229 +37 49 56.186656627           ~ 2 0
14 Cl* NGC 6791 KR V121 EB* 19 21 29.0285211312 +37 55 56.212076820         16.40 ~ 6 0
15 Cl* NGC 6791 KR V122 V* 19 21 38.5201363560 +37 38 29.006604060     20.92     ~ 2 0
16 Cl* NGC 6791 KR V123 dS* 19 21 43.46 +37 39 56.9   17.53 17.08     ~ 3 0
17 Cl* NGC 6791 HSG S7 V*? 19 21 53.4534545616 +37 49 44.981265108           ~ 1 0
18 Cl* NGC 6791 KR V124 EB* 19 21 54.4946959440 +37 40 53.448665772         16.55 ~ 6 0

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