J/MNRAS/349/641 VIc, CT1 magnitudes in Trumpler 5 (Piatti+, 2004)
The old open cluster Trumpler 5: a reddened, metal-poor anticentre cluster.
Piatti A.E., Claria J.J., Ahumada A.V.
<Mon. Not. R. Astron. Soc., 349, 641-648 (2004)>
=2004MNRAS.349..641P 2004MNRAS.349..641P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, VRI ;
Photometry, CMT1T2V
Keywords: techniques: photometric - open clusters and associations: general -
open clusters and associations: individual: Trumpler 5
Abstract:
CCD observations in the Johnson V, Kron-Cousins I and the Washington
system C and T1 passbands have been used to generate colour-magnitude
diagrams (CMDs) reaching down to V∼21.0mag and T1∼19.0 for
Trumpler 5, an old open cluster located towards the Galactic
anticentre. Our data analysis confirms the existence of non-uniform
extinction over the face of the cluster, the mean E(V-I) and E(C-T1)
values being 0.80±0.05 and 1.17±0.15, respectively. Through
comparison of the cluster CMDs with theoretical isochrones of the
Geneva group, Washington Standard Giant Branches and measures of V and
T1 indices, we derive the following values for the cluster apparent
distance modulus, age, and metallicity: V-MV=13.80±0.30
(corresponding to a distance from the Sun of 2.4±0.5 kpc and 0.04kpc
above the Galactic plane), t=5.0±0.5Gyr and [Fe/H]=-0.30±0.15. We
estimate the cluster angular radius to be about 7.7 arcmin (=5.4pc)
from star counts carried out within and outside the cluster field.
Description:
The observations were carried out with the Cerro Tololo Inter-American
Observatory (CTIO) 0.9-m telescope in 1997 December, with the
2048x2048pix CCD Tektronix 2K #3, as described in Paper I (Piatti et al.,
Cat. J/MNRAS/340/1249) for the open cluster NGC 2194. The scale on
the chip is 0.40arcsec/pixel, yielding an area of 13.6x13.6arcmin2.
The filters used were the Johnson V, Kron-Cousins I and Washington
system C and T1.
Objects:
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RA (2000) DE Designation(s)
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06 36 42 +09 26.0 Cl Trumpler 5
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 52 5094 CCD VI data of stars in the field of Tr 5
table2.dat 52 2953 CDD T1C data of stars in the field of Tr 5
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See also:
J/A+AS/133/25 : CCD BVI photometry of Trumpler 5 (Kaluzny 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- PCA Sequential number, Cl* Trumpler 5 PCA NNNN
6- 13 F8.3 pix Xpos X position (G1)
15- 22 F8.3 pix Ypos Y position (G1)
25- 30 F6.3 mag Vmag V magnitude
32- 36 F5.3 mag e_Vmag rms uncertainty on Vmag
38- 43 F6.3 mag V-Ic V-Ic colour index
45- 49 F5.3 mag e_V-Ic rms uncertainty on V-Ic
52 I1 --- o_Vmag Number of observations
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- PCA Sequential number, Cl* Trumpler 5 PCA NNNN
6- 13 F8.3 pix Xpos X position (G1)
15- 22 F8.3 pix Ypos Y position (G1)
25- 30 F6.3 mag T1mag T1 magnitude
32- 36 F5.3 mag e_T1mag rms uncertainty on T1mag
38- 43 F6.3 mag C-T1 C-T1 colour index
45- 49 F5.3 mag e_C-T1 rms uncertainty on C-T1
52 I1 --- o_T1mag Number of observations
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Global notes:
Note (G1): North is up and east is to the left. 1 pix = 0.40"
The adopted position of the cluster centre is
(Xc, Yc) = (990±25, 1400±25) pixels.
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Acknowledgements: Andres Piatti
(End) James Marcout, Patricia Vannier [CDS] 07-May-2004