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J/AJ/106/181       CCD photometry of open cluster M67         (Montgomery+ 1993)

CCD photometry of the old open cluster M67 Montgomery K.A., Marschall L.A., Janes K.A. <Astron. J. 106, 181 (1993)> =1993AJ....106..181M
ADC_Keywords: Clusters, open; Photometry, CCD; Photometry, UBVRI; Cross identifications Abstract: We present a CCD photometric survey of the central one-half degree of the old open cluster, M67, in U, B, V, and I colors to magnitude V=20. Extensive comparison of our photometry with other published datasets shows excellent agreement, indicating that CCD photometry is capable of producing a uniform set of measurements consistent with the photometric system defined primarily by the Landolt standard sequence. The color-magnitude diagram of the cluster shows a well-defined main sequence extending at least to the limit of the photometry at M(V)=10.55 and a substantial binary sequence. At least 38 percent of cluster stars are binaries. The observations were performed on 3 nights on 15-18 February 1990 with the 1.09m telescope at Kitt Peak National Observatory with a Tektronix 5122 CCD camera; a standard KPNO UBVRI filter set was used, with BVR filters being the Harris et, and I the "nearly Mould" filter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 140 1456 Photometry in M67 table4.dat 68 48 Bright stars table5.dat 11 308 Sanders to MMJ cross-identification
See also: II/123 : UBV Photometry of Faint Stars (V>14.5) in M67 (Frolov+ 1986) V/52 : Photometry and Proper Motions of stars in M67 (Frolov+ 1986) J/A+AS/100/243 : Proper motions in M 67 (Zhao+ 1993) J/AJ/112/628 : Deep Wide-Field Spectrophotometry of M67 (Fan+ 1996) J/BaltA/7/369 : M67 CCD photometry (Boyle+, 1998) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
2- 5 I4 --- MMJ Star number in M67 (Cl* NGC 2682 MMJ in Simbad) 6 A1 --- n_MMJ [)*] Note as: ) = bright star (see "History" section below) * = star which falls on the photometric binary sequence in the color-magnitude diagram 9- 10 I2 h RAh Right Ascension 1950 (hours) 12- 13 I2 min RAm Right Ascension 1950 (minutes) 15- 19 F5.2 s RAs Right Ascension 1950 (seconds) 21 A1 --- DE- Declination 1950 (sign) 22- 23 I2 deg DEd Declination 1950 (degrees) 25- 26 I2 arcmin DEm Declination 1950 (minutes) 28- 31 F4.1 arcsec DEs Declination 1950 (seconds) 33- 38 F6.3 mag Vmag on Johnson system 40- 45 F6.3 mag B-V color index 47- 52 F6.3 mag U-B ? color index 54- 59 F6.3 mag V-R ? color index 61- 66 F6.3 mag V-I ? color index (I is "nearly Mould" filter) 68- 72 F5.3 mag e_Vmag ?=0 Mean error on V 74- 78 F5.3 mag e_B-V ?=0 Mean error on B-V 80- 84 F5.3 mag e_U-B ?=0 Mean error on U-B 86- 90 F5.3 mag e_V-R ?=0 Mean error on V-R 92- 96 F5.3 mag e_V-I ?=0 Mean error on V-I 98-101 F4.2 pix e_pos Mean error on the position 103-104 I2 --- o_Vmag Number of observations on V 106-107 I2 --- o_B-V Number of observations on B-V 109-110 I2 --- o_U-B Number of observations on U-B 112-113 I2 --- o_V-R Number of observations on V-R 115-116 I2 --- o_V-I Number of observations on V-I 118-140 A23 --- Refs Cross-references (1)
Note (1): - The first number corresponds to Sanders (1977A&AS...27...89S). - Numbers preceded with a roman numeral are from Eggen and Sandage (1964ApJ...140..130E) - Numbers preceded with an F are from Fagerholm (1906ArMAF...2s...1F) - Numbers preceded with a G refer to Gilliland et al. (1991AJ....101..541G) - table 4 reference is to stars brighter than 12th magnitude with the source of the photometry given in table4.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
2- 5 I4 --- MMJ Star number in M67 7- 8 I2 h RAh Right Ascension 1950 (hours) 10- 11 I2 min RAm Right Ascension 1950 (minutes) 13- 17 F5.2 s RAs Right Ascension 1950 (seconds) 19 A1 --- DE- Declination 1950 (sign) 20- 21 I2 deg DEd Declination 1950 (degrees) 23- 24 I2 arcmin DEm Declination 1950 (minutes) 26- 29 F4.1 arcsec DEs Declination 1950 (seconds) 33- 38 F6.3 mag Vmag on Johnson system 42- 47 F6.3 mag B-V color index 51- 56 F6.3 mag V-I ? color index 60- 61 A2 --- r_BVI Source of photometry (1) 65- 68 I4 --- Sanders Sanders' number (1977A&AS...27...89S)
Note (1): the following symbols are used: ES = Eggen and Sandage (1964ApJ...140..130E) JS = Janes and Smith (1984AJ.....89..487J) G = Gilliland et al. (1991AJ....101..541G) M = Murray et al. (Roy. Obs. Bull. No. 91) S = Sanders (1989RMxAA..17...31S)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
2- 6 A5 --- Sanders Sanders' number (1977A&AS...27...89S) 8- 11 I4 --- MMJ number as in Table 3
History: The declination of star MMJ 6470 (tables 3 and 4) was corrected (communication with Kent Montgomery, ) Courtesy Kent Montgomery. * 22-Nov-2004: The position of bright star 6482 (in table 3 and 4) has been corrected. * 28-Jul-2010: Redondant lines suppressed in table3
(End) Francois Ochsenbein [CDS] 22-Dec-1993
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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