J/A+A/379/136 UBVRI photometry of 3 young open clusters (Carraro+, 2001)
Star clusters in the Carina complex: UBVRI photometry of NGC 3114, Collinder 228
and vdB-Hagen 99.
Carraro G., Patat F.
<Astron. Astrophys. 379, 136 (2001)>
=2001A&A...379..136C 2001A&A...379..136C
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: stars: evolution - stars: general -
stars: Hertzsprung-Russel (HR) and C-M diagrams -
open clusters and associations: individual: NGC 3114 -
open clusters and associations: individual: Collinder 228 -
open clusters and associations: individual: vdB-Hagen 99
Abstract:
In this paper we present and analyze CCD UBVRI photometry in the region
of the three young open clusters NGC 3114, Collinder 228, and
vdB-Hagen 99, located in the Carina spiral feature. NGC 3114 lies in
the outskirts of the Carina nebula. We found 7 star members in a
severely contaminated field, and obtain a distance of 950pc and an
age less than 3x108yrs. Collinder 228 is a younger cluster
(8x106yrs), located in front of the Carina nebula complex, for which
we identify 11 new members and suggest that 30% of the stars are
probably binaries. As for vdB-Hagen 99, we add 4 new members,
confirming that it is a nearby cluster located at 500pc from the Sun
and projected toward the direction of the Carina spiral arm.
Observations were conducted at La Silla on April 13-16, 1996,
with the 0.92m ESO-Dutch telescope.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------
10 02 42.7 -60 06 32.1 NGC 3114
10 43 01.3 -60 00 44.8 Collinder 228
10 37 54.2 -59 11 47.1 vdB-Hagen 99
-----------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
ngc3114.dat 102 2060 Photometry of NGC 3114
coll228.dat 102 1112 Photometry of Collinder 228
vdbh99.dat 102 898 Photometry of VdB-Hagen 99
tables.dat 77 21 Photometry of the stars in the field of the open
clusters in common with other works
(tables 3, 5 and 7 of the paper)
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Byte-by-byte Description of file: ngc3114.dat coll228.dat vdbh99.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Identification number in the cluster
6- 13 F8.3 pix Xpos X coordinates (1)
15- 22 F8.3 pix Ypos Y coordinates (1)
24- 30 F7.4 mag Umag ?=99.99 U band magnitude
32- 38 F7.4 mag e_Umag ?=99.99 Error in Umag
40- 46 F7.4 mag Bmag ?=99.99 B band magnitude
48- 54 F7.4 mag e_Bmag ?=99.99 Error in Bmag
56- 62 F7.4 mag Vmag ?=99.99 V band magnitude
64- 70 F7.4 mag e_Vmag ?=99.99 Error in Vmag
72- 78 F7.4 mag Rmag ?=99.99 R band magnitude
80- 86 F7.4 mag e_Rmag ?=99.99 Error in Rmag
88- 94 F7.4 mag Imag ?=99.99 I band magnitude
96-102 F7.4 mag e_Imag ?=99.99 Error in Imag
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Note (1): The positions are accurate to 1 pixel.
1 pix = 0.44 arcsec. North is up and East is left
Coordinates of the centers:
NGC 3114 (0.0, 300.0); RA=10 02 42.7 (2000) DE=-60 06 32.1
Collinder 228 (0.0, 300.0); RA=10 43 01.3 (2000) DE=-60 00 44.8
VdB-Hagen 99 (0.0, 0.0); RA=10 37 54.2 (2000) DE=-59 11 47.1
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Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name (NGC 3114, Col 228 or VdBH 99)
10- 11 I2 --- ID Star number in the cluster
13- 24 A12 --- Oname Other name (1)
26- 34 A9 --- HD HD name
36- 41 F6.3 mag Vmag Present study V magnitude
43- 47 F5.3 mag (B-V) Present study (B-V) colour index
49- 54 F6.3 mag (U-B) ? Present study (U-B) colour index
57- 62 F6.3 mag Vmag2 Other study V magnitude
63- 68 F6.3 mag (B-V)2 Other study (B-V) colour index
70- 75 F6.3 mag (U-B)2 ? Other study (U-B) colour index
77 A1 --- r_Vmag2 Reference for Vmagl, (B-V)l and (U-B)l (2)
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Note (1): Other names:
JM NNN = NGC 3114 NN, for Jankowitz & McCosh (1963MNSSA..22...18J 1963MNSSA..22...18J) list
FMF NN = Cl Collinder 228 NN in Simbad
Note (2): References for Vmag2, (B-V)2 and (U-B)2:
3: Jankowitz & McCosh, 1963MNSSA..22...18J 1963MNSSA..22...18J
5: Feinstein et al., 1976A&AS...24..389F 1976A&AS...24..389F
7: Landolt et al., 1990AJ....100..695L 1990AJ....100..695L
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Acknowledgements: Giovanni Carraro
References:
Patat & Carraro, Bochum 9, 10 and 11, 2001MNRAS.325.1591P 2001MNRAS.325.1591P
Carraro et al., NGC 3324 and Loden 165, 2001A&A...371..107C 2001A&A...371..107C
(End) Patricia Bauer [CDS] 05-Nov-2001