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J/MNRAS/327/23 CCD UBVRI photometry of 7 open star clusters (Sagar+, 2001)
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A multicolour CCD photometric and mass function study of the distant southern
open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis
20 and NGC 6253.
Sagar R., Munari U., de Boer K.S.
<Mon. Not. R. Astron. Soc. 327, 23 (2001)>
=2001MNRAS.327...23S (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: stars: evolution - Hertzsprung-Russell (HR) diagram -
stars: luminosity function, mass function -
open clusters and association: general
Abstract:
We derive cluster parameters and mass functions from new UBVRI CCD
photometric observations of ~3500 stars reaching down to V~20mag for
the distant southern open star clusters NGC 3105, NGC 3603,
Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253. For NGC 3105
and Hogg 15, CCD data are presented for the first time. The
observations were carried out in 1992 between February 28 and March 8,
June 5 and 9, and July 9 and 12 in the Cousins U, B, V, R and I
photometric bands using CCD detector at the 1.0-m Elizabeth Telescope
at the South African Astronomical Observatory (SAAO), Sutherland.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 7 Preliminary information about the clusters
table4.dat 49 160 NGC 3105 cluster and field regions CCD relative
positions and photometric magnitudes of stars
table5.dat 49 486 NGC 3603 cluster and field region CCD relative
positions and magnitudes of stars
table6.dat 49 261 Melotte 105 cluster and field regions CCD relative
positions and magnitudes of stars
table7.dat 53 337 Hogg 15 field relative positions CCD UBVRI
magnitudes of stars
table8.dat 49 1074 NGC 4815 cluster and field regions CCD relative
positions and magnitudes of stars
table9.dat 45 139 Pismis 20 CCD relative positions and magnitudes of
stars
table10.dat 49 1024 NGC 6253 cluster and field regions CCD relative
positions and magnitudes of stars
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See also:
J/A+AS/111/85 : Open cluster Pis 20 (Vazquez+, 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
14- 22 A9 --- CName IAU designation (C HHMM-DDd, B1950)
25- 27 I3 --- OCl OCl number
29- 34 F6.2 deg GLON Galactic longitude
36- 40 F5.2 deg GLAT Galactic latitude
42- 44 F3.1 kpc R Galactic distance
46- 49 I4 pc Z Height above the plane
51- 54 A4 --- Class Trumpler class (1)
56- 58 F3.1 arcmin Rad Radius
60- 62 F3.1 kpc Dist Distance
64- 67 F4.2 mag E(B-V) Reddening
69- 72 I4 Myr Age Age
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Note (1): Trumpler class (Trumpler, 1930LicOB..14..154T):
51-52: Trumpler concentration class (I II)
I: Detached cluster with strong central concentration
II: Detached cluster with little central concentration
53: Trumpler Range class (1/3)
1: Most cluster stars are nearly of the same apparent
brightness
2: A medium range in the brightnesses of stars
3: Bright and faint stars are both present. Generally a few
very bright stars and some moderately bright stars
embedded in a body of fainter stars can be seen
54: Trumpler Richness class (mpr)
p: a poor cluster, n < 50 stars
m: a moderately rich cluster, 50 < n < 100 stars
r: a rich cluster, n > 100 stars
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Byte-by-byte Description of file: table4.dat, table5.dat, table6.dat
Byte-by-byte Description of file: table8.dat, table10.dat
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Bytes Format Units Label Explanations
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1 A1 --- Region [CF] C: cluster region, F: field region
3- 6 I4 --- Seq Sequential number (1)
8- 13 F6.2 pix Xpos X position (G1)
15- 20 F6.2 pix Ypos Y position (G1)
22- 26 F5.2 mag Vmag V magnitude
28- 32 F5.2 mag U-B ? U-B colour index
34- 37 F4.2 mag B-V ? B-V colour index
39- 43 F5.2 mag V-R ? V-R (Cousins) colour index
45- 49 F5.2 mag V-I ? V-I (Cousins) colour index
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Note (1): For NGC 3105 cluster region (table4), stars observed earlier have the
numbering system of Moffat & FitzGerald (1974A&AS...16...25M,
NGC 3105 NNN) taken from the cluster data base, while the numbering
of stars observed for the first time by us starts with 201 in column
Seq.
For NGC 3603 cluster region (table5), stars observed earlier have the
numbering system of Sher (1965MNRAS.129..237S, NGC 3603 NN) taken
from the cluster data base, while the numbering of stars observed for
the first time by us starts with 301 in column Seq.
For Melotte 105 cluster region (table6), stars observed earlier have
the numbering system of Sher (1965MNRAS.129..237S, Cl Melotte 105 NN)
taken from the cluster data base, while the numbering of stars
observed for the first time by us starts with 501 in column Seq.
For NGC 4815 cluster region (table8), stars observed earlier is taken
from the cluster data base, while the numbering of stars observed for
the first time by us starts with 9001 in column Seq.
For NGC 6253 cluster region (table10), stars observed earlier have the
numbering system of Bragaglia et al. (1997MNRAS.284..477B,
Cl* NGC 6253 BTT N) taken from the cluster data base, while the
numbering of stars observed for the first time by us starts with
6001 in column Seq.
In the field regions, stars observed by us are numbered in increasing
order of X value.
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Byte-by-byte Description of file: table7.dat, table9.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number (1)
5- 10 F6.2 pix Xpos X position (G1)
12- 17 F6.2 pix Ypos Y position (G1)
19- 23 F5.2 mag Vmag V magnitude
25- 29 F5.2 mag U-B ? U-B colour index
31- 35 F5.2 mag B-V ? B-V colour index
37- 40 F4.2 mag V-R ? V-R (Cousins) colour index
42- 45 F4.2 mag V-I V-I (Cousins) colour index
47- 55 A9 --- Name Other identifications
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Note (1): In Hogg 15 (table7), stars observed by Moffat (1974A&A....35..315M)
and Feinstein & Marraco (1971PASP...83..218F) have been prefixed with
M and FM respectively in the last column.
In Pismis 20 (table9), stars observed earlier have the numbering
system of Vazquez et al. (1995, Cat. <J/A+AS/111/85>,
Cl* Pismis 20 VWP NNN), while the numbering of stars observed for the
first time by us starts with 501 in column Seq.
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Global notes:
Note (G1): North is up and East is left. 1 pix = 0.39arcsec.
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History:
From electronic version of the journal
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(End) James Marcout, Patricia Bauer [CDS] 30-Jan-2002