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| DOI | 10.1088/1538-3873/AAE660 | ||||
| Año | 2019 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Flux-calibrated integrated spectra have been obtained for a sample of 16 blue compact and high surface brightness Large Magellanic Cloud (LMC) star clusters. The spectra cover the wavelength range 3700-6800 angstrom, with a typical resolution and dispersion of 14 angstrom and 3.5 angstrom/pixel, respectively. We simultaneously derive foreground E(B - V) reddening values and ages for the clusters by comparing the line strengths and continuum distribution of their integrated spectra with those of LMC cluster spectra templates. As a first approach to obtain cluster ages, we also use the equivalent width (EW) of Balmer absorption lines and some diagnostic diagrams involving the sum of the EWs of selected spectral lines. Through evolutionary synthesis models for simple stellar populations and using a full-spectrum fitting code, we also derive reddenings, ages, and metallicities (Z/Z(circle dot)) for the cluster sample. No metallicity determinations have been previously performed for nine out of the 16 clusters here studied. We find good agreement between the cluster ages derived from the template-matching method and those ages estimated from theoretical evolutionary synthesis models. All of the studied clusters are found to be young, with ages ranging from 15 Myr (NGC 1693) to 80 Myr (NGC 2160), affected by reddening values typical for the LMC: 0.00 < E (B - V) < 0.20. The derived metallicities Z/Z(circle dot) range from 0.2 up to 1.0 (solar metal content). We compare our results with those reported in the literature, and discuss the distribution of metallicity values. In an effort to create a spectral library at LMC metallicity level with several clusters per age range, the present cluster sample stands out as a useful complement to previous ones.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | AHUMADA, ANDREA, V | Mujer |
UNIV NACL CORDOBA - Argentina
Comision Nacional de Investigacion Cientifica y Tecnologica - Argentina Observatorio Astronomico de la Universidad Nacional de Cordoba - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Argentina |
| 2 | Vega-Neme, Luis R. | Hombre |
UNIV NACL CORDOBA - Argentina
Comision Nacional de Investigacion Cientifica y Tecnologica - Argentina Observatorio Astronomico de la Universidad Nacional de Cordoba - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Argentina |
| 3 | Claria, Juan J. | Hombre |
UNIV NACL CORDOBA - Argentina
Comision Nacional de Investigacion Cientifica y Tecnologica - Argentina Observatorio Astronomico de la Universidad Nacional de Cordoba - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas - Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) - Argentina |
| 4 | Minniti, Javier H. | Hombre |
Pontificia Universidad Católica de Chile - Chile
ESO - Chile European Southern Observatory Santiago - Chile |
| Fuente |
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| SECYT (Universidad Nacional de Cordoba) |
| Agencia Nacional de Promocion Cientfica y Tecnologica (ANPCyT) |
| Argentinian institutions Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) |
| Agradecimiento |
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| We thank the CASLEO telescope allocation committee and staff members and night assistants of CASLEO for their first-class support. We also thank Dr. Alejandro Benitez-Llambay for his valuable help during one of the observation runs. We thank the anonymous referee for the valuable comments and suggestions which helped us to improve our manuscript significantly. This research was partially supported by the Argentinian institutions Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Agencia Nacional de Promocion Cientfica y Tecnologica (ANPCyT) and SECYT (Universidad Nacional de Cordoba). This research has made use of NASAs Astrophysics Data System Bibliographic Services as well as of the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of "Aladin Sky Atlas" developed at CDS, Strasbourg Observatory, France (2000, A&AS 143, 33B, and 2014, ASPC 485, 277B). We also made use of the VizieR catalog access tool, CDS, Strasbourg, France. |