J/MNRAS/391/1482 BVIc photometry of Trumpler 20 (Platais+, 2008)
Trumpler 20 - an old and rich open cluster.
Platais I., Melo C., Fulbright J.P., Kozhurina-Platais V., Figueira P.,
Barnes S.A., Mendez R.A.
<Mon. Not. R. Astron. Soc., 391, 1482-1488 (2008)>
=2008MNRAS.391.1482P 2008MNRAS.391.1482P
ADC_Keywords: Clusters, open ; Photometry, UBVRI
Keywords: stars: abundances -
open clusters and associations: individual: Trumpler 20
Abstract:
We show that the open cluster Trumpler 20, contrary to the earlier
findings, is actually an old Galactic open cluster. New CCD photometry
and high-resolution spectroscopy are used to derive the main
parameters of this cluster. At [Fe/H]=-0.11 for a single red giant
star, the metallicity is slightly subsolar. The best fit to the
colour-magnitude diagrams is achieved using a 1.3-Gyr isochrone with
convective overshoot. The cluster appears to have a significant
reddening at E(B-V)=0.46 (for B0 spectral type), although for red
giants this high reddening yields the colour temperature exceeding the
spectroscopic Teff by about 200K. Trumpler 20 is a very rich open
cluster, containing at least 700 members brighter than MV=+4. It may
extend over the field of view available in our study at
20x20arcmin2.
Description:
In 2008 March 20-22, new photometric CCD observations of Tr 20 were
obtained at the CTIO 1-m telescope, operated by the Small and Moderate
Aperture Research Telescope System (SMARTS) consortium.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tr20.dat 67 7166 BVI photometry in Tr 20
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See also:
J/ApJS/161/118 : Photometry of open clusters (McSwain+, 2005)
Byte-by-byte Description of file: tr20.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number,
Cl* Trumpler 20 PMF NNNN in Simbad
6- 14 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
16- 24 F9.5 deg DEdeg Declination in decimal degrees (J2000)
26- 31 F6.3 mag Vmag Johnson V magnitude
33- 38 F6.3 mag B-V ?=99.999 Johnson B-V colour index
40- 45 F6.3 mag V-Ic ?=99.999 Johnson-Cousins V-Ic colour index
47- 51 F5.3 mag e_Vmag rms uncertainty on Vmag
53- 57 F5.3 mag e_B-V ?=0.000 rms uncertainty on B-V
59- 63 F5.3 mag e_V-Ic ?=0.000 rms uncertainty on V-Ic
65 I1 --- o_B-V Number of observations in B-V
67 I1 --- o_V-Ic Number of observations in V-Ic
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History:
From electronic version of the journal
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(End) Patricia Vannier [CDS] 07-Apr-2009