INVESTIGADORES
PIATTI Andres Eduardo
artículos
Título:
Spectroscopic analysis of the candidate globular clusters NGC 1928 and 1939 in the Large Magellanic Cloud
Autor/es:
DUTRA, C; BICA, EDUARDO; CLARIA OLMEDO, JUAN JOSÉ; PIATTI, ANDRÉS E.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Referencias:
Año: 1999 vol. 305 p. 373 - 379
ISSN:
0035-8711
Resumen:
The integrated spectral properties in the range 3600-6700 A of the
candidate old clusters NGC 1928 and 1939 in the LMC bar are compared
with those of old- and intermediate-age reference LMC clusters, the
properties of which are better established. It has been possible to
infer the age of the sample clusters by means of absorption features and
the continuum distribution, in particular in the plane W_M x W_B (where
W_B is the average of Hdelta, Hγ and H beta equivalent widths, and
W_M that of Ca II K, G band and Mg i). The results indicate that NGC
1928 and 1939 are compatible with old clusters. The metallicity is
derived with respect to galactic globular cluster templates: [Fe/H]~
-1.2 and -2.0 for NGC 1928 and 1939, respectively. We also discuss the
census of Population II clusters in the LMC, their spatial distribution
and the possibility of a LMC core and a transient morphological
classification for interacting late-type disc galaxies.