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Colour-Magnitude Diagrams of candidate age-gap filling LMC clusters

Balbinot, E, Santiago, B, Kerber, L, Barbuy, B and Dias, B (2009) Colour-Magnitude Diagrams of candidate age-gap filling LMC clusters

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The LMC has a rich star cluster system spanning a wide range of ages and masses. One striking feature of the LMC cluster system is the existence of an age gap between 3-10 Gyrs. Four LMC clusters whose integrated colours are consistent with those of intermediate age simple stellar populations have been imaged with the Optical Imager (SOI) at the Southern Telescope for Astrophysical Research (SOAR). Their colour-magnitude diagrams (CMDs) reach V ~ 24. Isochrone fits, based on Padova evolutionary models, were carried out to these CMDs, after subtraction of field contamination. The preliminary results are as follows: KMK88-38 has an age of ~ 1.3 Gyr, assuming typical LMC metallicity and distance modulus, and a very low redenning. For OGLE-LMC0531, the best eye fits to isochrones yield an age ~ 1.6 Gyr and E(B-V)=0.03. BSDL917 is younger, ~ 150 yrs, and subjected to larger extinction (E(B-V)=0.08). The remaining cluster is currently under analysis. Therefore, we conclude that these clusers are unlikely to fill in the LMC cluster age gap, even when fitting uncertainties in the parameters are considered.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Santiago, B
Kerber, L
Barbuy, B
Dias, B
Date : 16 July 2009
Uncontrolled Keywords : astro-ph.CO, astro-ph.CO, astro-ph.GA
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:22
Last Modified : 04 Dec 2019 16:13

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