J/MNRAS/369/697 VRI photometry of SMC/LMC globular clusters (Goudfrooij+, 2006)
Integrated-light VRI imaging photometry of globular clusters in the
Magellanic Clouds.
Goudfrooij P., Gilmore D., Kissler-Patig M., Maraston C.
<Mon. Not. R. Astron. Soc., 369, 697-704 (2006)>
=2006MNRAS.369..697G 2006MNRAS.369..697G
ADC_Keywords: Magellanic Clouds ; Clusters, globular ; Photometry, VRI
Keywords: techniques: photometric - galaxies: evolution - Magellanic Clouds -
galaxies: star clusters
Abstract:
We present accurate integrated-light photometry in Johnson/Cousins V,
R and I for a sample of 28 globular clusters in the Magellanic Clouds.
The majority of the clusters in our sample have reliable age and
metallicity estimates available in the literature. The sample
encompasses ages between 50Myr and 7Gyr, and metallicities ([Fe/H])
between 1.5 and 0.0dex. The sample is dominated by clusters of ages
between roughly 0.5 and 2Gyr, an age range during which the
bolometric luminosity of simple stellar populations is dominated by
evolved red giant branch stars and thermally pulsing asymptotic giant
branch (TP-AGB) stars whose theoretical colours are rather uncertain.
The VRI colours presented in this paper have been used to calibrate
stellar population synthesis model predictions.
Description:
Observations were performed during two runs at the 0.9-m telescope of
the Cerro Tololo Inter-American Observatory (CTIO) in f/13.5 mode
using the CCD imager and a dedicated 2048x2048 SITe CCD, which was
employed in gain setting 2 (1.5e/ADU), yielding a read noise of
3.6e/pix. With a plate scale of 0.40arcsec/pix, the field of view is
13.6x13.6arcmin2. Images were taken through Johnson V and
Kron-Cousins R and I filters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 28 General properties of globular clusters in
our sample
tablea1.dat 77 112 VRI photometry of globular clusters in the
Magellanic Clouds
refs.dat 124 16 References
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See also:
J/MNRAS/272/391 : Globular clusters in the Magellanic Clouds (Ferraro+, 1995)
J/ApJS/155/401 : SMC/LMC globular clusters ISOCAM obs. (Tanabe+, 2004)
J/AJ/118/2839 : BV photometry of NGC 1866 (Testa+, 1999)
J/A+A/324/505 : Core velocity dispersions of globular clusters (Dubath+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Group [SMC LMC]
5- 13 A9 --- Cluster Cluster name
14- 15 I2 h RAh Right ascension (J2000) (1)
17- 18 I2 min RAm Right ascension (J2000) (1)
20- 21 I2 s RAs Right ascension (J2000) (1)
23 A1 --- DE- Declination sign (J2000) (1)
24- 25 I2 deg DEd Declination (J2000) (1)
27- 28 I2 arcmin DEm Declination (J2000) (1)
30- 31 I2 arcsec DEs Declination (J2000) (1)
33- 38 A6 ---- Type SWB classification type (2)
40- 43 F4.2 [yr] logAge Age
45- 48 F4.2 [yr] E_logAge ? Error on logAge (upper limit)
50- 53 F4.2 [yr] e_logAge ? Error on logAge (lower limit)
55- 58 A4 --- r_logAge Reference for Age
60- 64 F5.2 [Sun] [Fe/H] ?=- Metallicity
66- 69 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H]
71- 74 A4 --- r_[Fe/H] Reference for [Fe/H]
76- 79 F4.2 mag AV Assumed foreground extinction in V band (3)
80 A1 --- n_AV [*] *: AV from Schelgel et al.
(1998ApJ...500..525S 1998ApJ...500..525S)
82- 85 F4.2 mag e_AV rms uncertainty on AV
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Note (1): Positions from Welch (1991AJ....101..538W 1991AJ....101..538W) for the SMC clusters and
from Bica et al. (1999, Cat. J/AJ/117/238) for the LMC clusters.
Note (2): WB type (Searle et al., 1980ApJ...239..803S 1980ApJ...239..803S) from Frogel et al.
(1990ApJ...352...96F 1990ApJ...352...96F) or Bica et al. (1996ApJS..102...57B 1996ApJS..102...57B).
Note (3): Assumed foreground extinction derived from data in Zaritsky et al.
(2002, Cat. J/AJ/123/855, 2004, Cat. J/AJ/128/1606), made
available through http://ngala.as.arizona.edu/dennis/lmcdata.html
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Group SMC or LMC
5- 13 A9 --- Cluster Cluster name
14- 16 I3 arcsec Diam Aperture diameter
18- 23 F6.3 mag Vmag Johnson V magnitude
25- 29 F5.3 mag e_Vmag rms uncertainty on Vmag
31- 35 F5.3 mag V-Rc ? V-Rc colour index
37- 41 F5.3 mag e_V-Rc ? rms uncertainty on V-Rc
43- 47 F5.3 mag V-Ic V-Ic colour index
49- 53 F5.3 mag e_V-Ic rms uncertainty on V-Ic
55- 59 F5.3 mag (V-Rc)0 ? Dereddened V-Rc colour index
61- 65 F5.3 mag e_(V-Rc)0 ? rms uncertainty on (V-Rc)0
67- 71 F5.3 mag (V-Ic)0 Dereddened V-Ic colour index
73- 77 F5.3 mag e_(V-Ic)0 rms uncertainty on (V-Ic)0
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 48 A25 --- aut Author's name
50-124 A75 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Oct-2006