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J/MNRAS/463/1446    Star clusters in Magellanic Clouds       (Nayak+, 2016)

Star clusters in the Magellanic Clouds. I. Parameterisation and classification of 1072 clusters in the LMC. Nayak P.K., Subramaniam A., Choudhury S., Indu G., Sagar R. <Mon. Not. R. Astron. Soc., 463, 1446-1461 (2016)> =2016MNRAS.463.1446N (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Stars, ages Keywords: Hertzsprung-Russell and colour-magnitude diagrams - Magellanic Clouds - galaxies: star formation Abstract: We have introduced a semi-automated quantitative method to estimate the age and reddening of 1072 star clusters in the Large Magellanic Cloud (LMC) using the Optical Gravitational Lensing Experiment (OGLE) III survey data. This study brings out 308 newly parameterised clusters. In a first of its kind, the LMC clusters are classified into groups based on richness/mass as very poor, poor, moderate and rich clusters, similar to the classification scheme of open clusters in the Galaxy. A major cluster formation episode is found to happen at 125±25Myr in the inner LMC. The bar region of the LMC appears prominently in the age range 60-250Myr and is found to have a relatively higher concentration of poor and moderate clusters. The eastern and the western ends of the bar are found to form clusters initially, which later propagates to the central part. We demonstrate that there is a significant difference in the distribution of clusters as a function of mass, using a movie based on the propagation (in space and time) of cluster formation in various groups. The importance of including the low mass clusters in the cluster formation history is demonstrated. The catalog with parameters, classification, and cleaned and isochrone fitted CMDs of 1072 clusters, which are available as online material, can be further used to understand the hierarchical formation of clusters in selected regions of the LMC. Description: In this study, we have identified star clusters of the Bica et al. (2008, , Cat. J/MNRAS/389/678) catalogue in the OGLE III (Udalski et al., 2008AcA....58...89U) observed region and characterized them using the V, I photometric data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 78 1072 A catalog is 1072 LMC star clusters are presented here
See also: J/MNRAS/389/678 : Catalogue of extended objects in Magellanic Clouds (Bica+, 2008) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Cluster name 13 I1 h RAh Central right ascension (J2000) (1) 15- 16 I2 min RAm Central right ascension (J2000) (1) 18- 19 I2 s RAs Central right ascension (J2000) (1) 21 A1 --- DE- Central declination sign (J2000 (1) 22- 23 I2 deg DEd Central declination (J2000 (1) 25- 26 I2 arcmin DEm Central declination (J2000 (1) 28- 29 I2 arcsec DEs Central declination (J2000 (1) 31- 34 F4.2 arcmin Radius Size of the cluster (1) 36- 39 F4.2 mag E(V-I) Estimated reddening 41- 44 F4.2 [yr] log(t) Estimated age 46- 49 F4.2 [yr] log(tG10) ?=- Glatt et al. (2010, Cat. J/A+A/517/A50) estimation of age 51 A1 --- l_log(tPU00) Limit flag on log(tPU00) 52- 55 F4.2 [yr] log(tPU00) ? Pietrzynski & Udalski (2000, Cat. J/AcA/50/337) estimation of age 56 A1 --- --- [,] 57- 60 F4.2 [yr] log(tPU00)2 ? Pietrzynski & Udalski (2000, Cat. J/AcA/50/337) estimation of age 61- 64 F4.2 [yr] log(tPal16) ? Palma et al. (2016, Cat. J/A+A/586/A41) earlier estimation of age 65 A1 --- --- [,] 66- 69 F4.2 [yr] log(tPal16)2 ? Palma et al. (2016, Cat. J/A+A/586/A41) estimation of age 71- 74 F4.2 [yr] log(tP14) ? Piatti et al. (2014A&A...570A..74P or 2015, Cat. J/MNRAS/454/839) earlier of age 76- 78 A3 --- Group Designated group number (I-V) of cluster
Note (1): from Bica et al. (2008, Cat. J/MNRAS/389/678).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 04-May-2018
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