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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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Note (1):
- The first number corresponds to Sanders (1977A&AS...27...89S 1977A&AS...27...89S).
- Numbers preceded with a roman numeral are from Eggen and Sandage
(1964ApJ...140..130E 1964ApJ...140..130E)
- Numbers preceded with an F are from Fagerholm (1906ArMAF...2s...1F 1906ArMAF...2s...1F)
- Numbers preceded with a G refer to Gilliland et al. (1991AJ....101..541G 1991AJ....101..541G)
- table 4 reference is to stars brighter than 12th magnitude with the
source of the photometry given in table4.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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 1977A&AS...27...89S)
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Note (1): the following symbols are used:
ES = Eggen and Sandage (1964ApJ...140..130E 1964ApJ...140..130E)
JS = Janes and Smith (1984AJ.....89..487J 1984AJ.....89..487J)
G = Gilliland et al. (1991AJ....101..541G 1991AJ....101..541G)
M = Murray et al. (Roy. Obs. Bull. No. 91)
S = Sanders (1989RMxAA..17...31S 1989RMxAA..17...31S)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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2- 6 A5 --- Sanders Sanders' number (1977A&AS...27...89S 1977A&AS...27...89S)
8- 11 I4 --- MMJ number as in Table 3
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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