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J/A+A/517/A50  Ages & luminosities of young SMC/LMC star clusters (Glatt+, 2010)

Ages and luminosities of young SMC/LMC star clusters and the recent star formation history of the Clouds. Glatt K., Grebel E.K., Koch A. <Astron. Astrophys. 517, A50 (2010)> =2010A&A...517A..50G
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Magnitudes Keywords: Magellanic Clouds - galaxies: clusters: general - galaxies: evolution Abstract: In this paper we discuss the age and spatial distribution of young (age<1Gyr) SMC and LMC clusters using data from the Magellanic Cloud Photometric Surveys. Luminosities are calculated for all age-dated clusters. Ages of 324 and 1193 populous star clusters in the Small and the Large Magellanic Cloud have been determined fitting Padova and Geneva isochrone models to their resolved color-magnitude diagrams. The clusters cover an age range between 10Myr and 1Gyr in each galaxy. For the SMC a constant distance modulus of (m-M)0=18.90 and a metallicity of Z=0.004 were adopted. For the LMC, we used a constant distance modulus of (m-M)0=18.50 and a metallicity of Z=0.008. For both galaxies, we used a variable color excess to derive the cluster ages. We find two periods of enhanced cluster formation in both galaxies at 160Myr and 630Myr (SMC) and at 125Myr and 800Myr (LMC). We present the spatially resolved recent star formation history of both Clouds based on young star clusters. The first peak may have been triggered by a close encounter between the SMC and the LMC. In both galaxies the youngest clusters reside in the supergiant shells, giant shells, the inter-shell regions, and toward regions with a high Hαcontent, suggesting that their formation is related to expansion and shell-shell interaction. Most of the clusters are older than the dynamical age of the supergiant shells. No evidence for cluster dissolution was found. Computed V band luminosities show a trend for fainter magnitudes with increasing age as well as a trend for brighter magnitudes with increasing apparent cluster radii. Description: Ages and luminosities for 324 SMC and 1193 LMC star clusters. For each star cluster reddening, radius, log(age(yr)), age uncertainties, right ascension, declination, V-band magnitudes, error(V), and cross-identification are given. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file lmc.dat 111 1194 LMC cluster ages, luminosities, reddenings, radii, cross-identifications smc.dat 111 322 SMC cluster ages, luminosities, reddenings, radii, cross-identifications
See also: J/A+AS/110/533 : Clusters and field stars in LMC. I. (Linde+, 1995) J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998) J/AcA/49/521 : OGLE LMC star clusters BVI photometry (Pietrzynski+, 1999) J/MNRAS/386/1380 : BVRI photometry of LMC star clusters (Kumar+, 2008) J/A+A/501/585 : CT1 photometry in five LMC star clusters (Piatti+, 2009) J/A+A/503/469 : Compact clusters in LMC catalogue of stars (Liu+, 2009) Byte-by-byte Description of file: lmc.dat smc.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Identification number (LMCNNNN or SMCNNNN) 8 A1 --- n_Name [*] Note on Name (1) 10- 14 F5.3 mag E(B-V) Foreground reddening 16- 20 F5.3 arcmin R Radius (2) 22 A1 --- l_Age Limit flag on log(Age) 23- 26 F4.2 [yr] Age Cluster age in logarithmic scale 27 A1 --- --- [/] 28- 31 F4.2 [yr] Age2 ? Second value of cluster age in logarithmic scale 33 I1 --- q_Age ?=- Class for Age uncertainties (3) 36 I1 h RAh Right ascension (J2000) 38- 39 I2 min RAm Right ascension (J2000) 41- 42 I2 s RAs [0/60] Right ascension (J2000) 44 A1 --- DE- Declination sign (J2000) 45- 46 I2 deg DEd Declination (J2000) 48- 49 I2 arcmin DEm Declination (J2000) 51- 52 I2 arcsec DEs [0/60] Declination (J2000) 54- 59 F6.3 mag Vmag V-band magnitude 61- 64 F4.2 mag e_Vmag Uncertainties of V-band magnitude 66-111 A46 --- Cross-ID Cross-Identification(s)
Note (1): Identification numbers with an asterix are possible double/multiple populations (Dieball et al., 2002, Cat. J/A+A/391/547) Note (2): Radii adopted from Bica et al., 2008, Cat. J/MNRAS/389/678. Note (3): Class code as follows: 1 = objects having Δ(log(age(yr)))<0.3 2 = objects having 0.3 <Δ(Log(Age(yr)))<0.5 3 = objects having Δ(Log(Age(yr)))>0.5
Acknowledgements: Katharina Glatt, kglatt(at)ari.uni-heidelberg.de History: * 09-Aug-2010: Original version * 05-Apr-2011: some names corrected
(End) Patricia Vannier [CDS] 08-Apr-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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