| Full text | |
| Author(s): |
Monteiro, H.
;
Dias, W. S.
;
Hickel, G. R.
;
Caetano, T. C.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | NEW ASTRONOMY; v. 51, p. 15-27, FEB 2017. |
| Web of Science Citations: | 6 |
| Abstract | |
In the second paper of the series we continue the investigation of open cluster fundamental parameters using a robust global optimization method to fit model isochrones to photometric data. We present optical UBVRI CCD photometry (Johnsons-Cousins system) observations for 24 neglected open clusters, of which 14 have high quality data in the visible obtained for the first time, as a part of our ongoing survey being carried out in the 0.6 m telescope of the Pico dos Dias Observatory in Brazil. All objects were then analyzed with a global optimization tool developed by our group which estimates the membership likelihood of the observed stars and fits an isochrone from which a distance, age, reddening, total to selective extinction ratio R-v (included in this work as a new free parameter) and metallicity are estimated. Based on those estimates and, their associated errors we analyzed the status of each object as real clusters or not, finding that two are likely to be asterisms. We also identify important discrepancies between our results and previous ones obtained in the literature which were determined using 2MASS photometry. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 13/01115-6 - A study of the galactic structure by means of open clusters |
| Grantee: | Jacques Raymond Daniel Lépine |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - Brazil |