J/MNRAS/243/492 BV Photometry of NGC 6791 (Kaluzny, 1990) ================================================================================ CCD BV photometry of the old open cluster NGC 6791. Kaluzny J. =1990MNRAS.243..492K ================================================================================ ADC_Keywords: Clusters, open ; Photometry, CCD Abstract: CCD BV photometry to V=20.5 of stars in the old open cluster NGC 6791 is presented. Comparison with the theoretical isochrones of VandenBerg gives a cluster age in the range of 10 to 12.5Gyr, and an apparent distance modulus of 13.45mag, adopting a solar metallicity. This cluster is only marginally younger than Palomar 12, which is the youngest globular cluster known. A search for short-period variables in the cluster field led to the discovery of only one low-amplitude variable, probably belonging to the FK Com-type stars. A very blue star was detected which may be an extremely young white dwarf formed in the cluster. Description: The CCD observations were made during 4 nights 1987-06-14 to 1987-06-17 at the Kitt Peak 0.9m telescope; the scale is around 0.86arcsec/pix. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 19 20 53 +37 46 18 NGC 6791 = Cl Berkeley 46 ---------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 61 1752 BV photometry of NGC 6791 ngc6791.dat 68 10389 Cross-identifications -------------------------------------------------------------------------------- See also: J/PASP/115/413 : A star catalog for the open cluster NGC 6791 (Stetson+, 2003) J/AJ/123/3460 : Low-amplitude variables in NGC 6791 (Mochejska+, 2002) J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 3- 7 I5 --- Seq [1/1759] Identification number 11- 16 F6.2 pix Xpos X position (1) 20- 25 F6.2 pix Ypos Y position (1) 29- 34 F6.3 mag Vmag V magnitude 39- 43 F5.3 mag e_Vmag rms uncertainty on Vmag 47- 52 F6.3 mag B-V B-V colour index 57- 61 F5.3 mag e_B-V rms uncertainty on B-V -------------------------------------------------------------------------------- Note (1): North is at the top and EAst is to the left; 100pix=86" -------------------------------------------------------------------------------- Byte-by-byte Description of file: ngc6791.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 2- 6 I5 --- Seq [1/16258] Identification number, this paper 9- 13 A5 --- ID1 Kinman (1965ApJ...142..655K) designation 14 A1 --- u_ID1 [?] Uncertainty flag on ID1 17- 18 A2 --- ID2 Harris & Canterna (1981AJ.....86.1332H) designation in Simbad 21- 23 I3 --- ID3 [1/146]?=- Anthony-Twarog & Twarog (1985ApJ...291..595A), in Simbad 26- 29 I4 --- ID4 [1/1759]?=- Kaluzny (1990MNRAS.243..492K) 32- 34 I3 --- ID5 [0/990]?=- Kaluzny & Udalski (1992AcA....42...29K), in Simbad 37- 39 A3 --- ID6 Garnavich et al. (1994AJ....107.1097G), in Simbad 42- 45 I4 --- ID7 [1/8062]?=- Montgomery et al. (1994AJ....108..585M), in Simbad 48- 50 A3 --- ID8 Kaluzny & Rucinski (1995A&AS..114....1K), in Simbad 53- 56 I4 --- ID9 [1/3927]?=- Kaluzny & Rucinski (1995A&AS..114....1K) in Simbad 59- 63 I5 --- ID10 [1206/15224]?=- Kaluzny & Rucinski (1995A&AS..114....1K), in Simbad 66- 68 A3 --- ID11 Mochejska et al. (2002AJ....123.3460M), in Simbad -------------------------------------------------------------------------------- History: Prepared by Peter Stetson from the microfiche of Table 2 ================================================================================ (End) Patricia Vannier [CDS] 09-Dec-2005