J/MNRAS/381/L84 CT1 photometry of 3 SMC old clusters (Piatti+, 2007)
Two newly identified, relatively old star clusters in the
Small Magellanic Cloud.
Piatti A.E., Sarajedini A., Geisler D., Gallart C., Wischnjewsky M.
<Mon. Not. R. Astron. Soc., 381, L84-L88 (2007)>
=2007MNRAS.381L..84P 2007MNRAS.381L..84P
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, CMT1T2V
Keywords: binaries: symbiotic - galaxies: individual: IC10 - Local Group
Abstract:
We present the results on the age and metallicity estimates of the
Small Magellanic Cloud (SMC) clusters L 110, L 112 and L 113 obtained
from CCD Washington CT1 photometry. We confirm L 113 as a relatively
old and metal-poor cluster, and report for the first time that L 110
and 112 are also relatively old clusters (t∼6.5Gyr) . Their derived
ages and metallicities reinforce previous suggestions that the farther
a cluster is from the centre of the galaxy, the older and more
metal-poor it is, with some dispersion. In addition, the bursting star
formation model still appears to be the most probable paradigm to
describe the SMC's star formation history. We call attention to a
second possible burst at ∼6-7Gyr, besides the known burst at ∼3Gyr.
Description:
The observations of L 110, 112 and 113 were obtained with the Danish
Faint Object Spectrograph and Camera (DFOSC) on the 1.54-m Danish
telescope at the European Southern Observatory (ESO) on La Silla, on
1999 Nov 5, 1999 Nov 4 and 1999 Dec 29, respectively.
Objects:
---------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------
01 34 26 -72 52 28 L110 = Cl Lindsay 110
01 35 58 -72 27 28 L112 = Cl Lindsay 112
01 49 28 -73 43 42 L113 = Cl Lindsay 113
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 51 3570 CCD CT1 data of stars in the field of L110
table3.dat 51 641 CCD CT1 data of stars in the field of L112
table4.dat 51 2401 CCD CT1 data of stars in the field of L113
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See also:
J/ApJS/101/41 : SMC and Bridge extended catalog (Bica+ 1995)
JMNRAS/382/1203 : CT1 photometry of 5 SMC star clusters (Piatti+, 2007)
Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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3- 6 I4 --- Star Star number within the cluster
8- 15 F8.3 pix Xpos X position (1)
17- 24 F8.3 pix Ypos Y position (1)
27- 32 F6.3 mag T1mag Washington T1 magnitude (633±80nm)
34- 38 F5.3 mag e_T1mag rms uncertainty on T1mag
40- 45 F6.3 mag C-T1 ?=99.999 Washington C-T1 colour index
(C filter is 391±110nm)
47- 51 F5.3 mag e_C-T1 ?=9.999 rms uncertainty on C-T1
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Note (1): 1pix=0.42arcsec.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Nov-2008