Structures in surface-brightness profiles of LMC and SMC star clusters: evidence of mergers?
arXiv:0804.4110 · doi:10.1051/0004-6361:20079298
Abstract
The LMC and SMC are rich in binary star clusters, and some mergers are expected. It is important to characterize single clusters, binary clusters and candidates to mergers. We selected a sample of star clusters in each Cloud with this aim. Surface photometry of 25 SMC and 22 LMC star clusters was carried with the ESO Danish 1.54 m telescope. 23 clusters were observed for the first time for these purposes. We fitted Elson, Fall and Freeman (1987, EFF) profiles to the data, deriving structural parameters, luminosities and masses. We also use isophotal maps to constrain candidates to cluster interactions.} {The structural parameters, luminosities and masses presented good agreement with those in the literature. Three binary clusters in the sample have a double profile. Four clusters (NGC 376, K 50, K 54 and NGC 1810) do not have companions and present as well important deviations from EFF profiles. The present sample contains blue and red Magellanic clusters. Extended EFF profiles were detected in some blue clusters. We find evidence that important deviations from the body of EFF profiles might be used as a tool to detect cluster mergers.
16 pages and 8 figures. Accepted by A&A
References in corpus (8)
- A double main sequence turn-off in the rich star cluster NGC 1846 in the Large Magellanic Cloud
- Open clusters in dense fields: the importance of field-star decontamination for NGC5715, Lynga4, Lynga9, Trumpler23, Trumpler26 and Czernik37
- The Stellar Mass Distribution in the Giant Star Forming Region NGC 346
- Old open clusters in the inner Galaxy: FSR1744, FSR89 and FSR31
- The Star-forming Region NGC 346 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations. II. Photometric Study of the Intermediate-Age Star Cluster BS 90
- Structural parameters of star clusters: relations among light, mass and star-count radial profiles and the dependence on photometric depth
- Surface Brightness Profiles for a sample of LMC, SMC and Fornax galaxy Globular Clusters
- HST WFPC2 Observations of the Peculiar Main Sequence of the Double Star Cluster NGC 2011 in the Large Magellanic Cloud