J/AJ/136/1703 Ridgelines of six intermediate-age SMC clusters (Glatt+, 2008)
Age determination of six intermediate-age Small Magellanic Cloud star clusters
with HST/ACS.
Glatt K., Grebel E.K., Sabbi E., Gallagher J.S., Nota A., Sirianni M.,
Clementini G., Tosi M., Harbeck D., Koch A., Kayser A., Da Costa G.
<Astron. J., 136, 1703-1727 (2008)>
=2008AJ....136.1703G 2008AJ....136.1703G
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, HST
Keywords: galaxies: star clusters - Magellanic Clouds
Abstract:
We present a photometric analysis of the star clusters Lindsay 1,
Kron 3, NGC 339, NGC 416, Lindsay 38, and NGC 419 in the Small
Magellanic Cloud (SMC), observed with the Hubble Space Telescope
Advanced Camera for Surveys (ACS) in the F555W and F814W filters. Our
color-magnitude diagrams (CMDs) extend ∼3.5mag deeper than the
main-sequence turnoff points, deeper than any previous data. Cluster
ages were derived using three different isochrone models: Padova,
Teramo, and Dartmouth, which are all available in the ACS photometric
system. Fitting observed ridgelines for each cluster, we provide a
homogeneous and unique set of low-metallicity, single-age fiducial
isochrones.
Description:
The SMC clusters Lindsay 1, Kron 3, NGC 339, NGC 416, Lindsay 38, and
NGC 419 were observed with the HST/ACS between 2005 August and 2006
March.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 65 6 Cluster positions, distances and ages
table4.dat 25 793 Ridgelines of Lindsay 1, Kron 3, NGC 339,
NGC 416, Lindsay 38, and NGC 419
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See also:
J/AJ/116/2395 : BV photometry in five SMC clusters (Mighell+, 1998)
J/A+A/452/179 : Ages of SMC young clusters and field stars (Chiosi+, 2006)
J/A+A/517/A50 : Young SMC/LMC star clusters ages + luminosities (Glatt+, 2010)
Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Cluster name
14- 15 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
17- 18 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
20- 23 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
25 A1 --- DE- Simbad Sign of the Declination (J2000.0)
26- 27 I2 deg DEd Simbad Degree of Declination (J2000.0)
29- 30 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
32- 33 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
35- 39 F5.2 mag Bmag Simbad B band magnitude
41- 45 F5.2 mag Vmag ? Simbad V band magnitude
47- 50 F4.1 kpc Dist Distance estimate (from table5 of the paper)
52- 54 F3.1 kpc e_Dist rms uncertainty on Dist
56- 58 F3.1 Gyr Age Age (from table6 of the paper)
59 A1 --- --- [-]
60- 62 F3.1 Gyr Ageu ? Upper limit of Age if interval
63- 65 F3.1 Gyr e_Age ? rms uncertainty on Age
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Cluster name
12- 17 F6.4 mag m555-m814 HST/ACS (F555W-F814W) color index
19- 25 F7.4 mag m555 HST/ACS F555W band magnitude
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Apr-2011