INVESTIGADORES
PIATTI Andres Eduardo
artículos
Título:
Integrated spectral properties of 7 galactic open clusters
Autor/es:
AHUMADA, A.V.; CLARIA OLMEDO, JUAN JOSÉ; BICA, EDUARDO; PIATTI, ANDRÉS E.
Revista:
ASTRONOMY & ASTROPHYSICS. SUPPLEMENT SERIES (PRINT)
Referencias:
Año: 2000 vol. 141 p. 79 - 88
ISSN:
0365-0138
Resumen:
This paper presents flux-calibrated integrated spectra in the range
3600-9000 Ä for 7 concentrated, relatively populous Galactic open
clusters. We perform simultaneous estimates of age and foreground
interstellar reddening by comparing the continuum distribution and line
strengths of the cluster spectra with those of template cluster spectra
with known parameters. For five clusters these two parameters have been
determined for the first time (Ruprecht 144, BH 132, Pismis 21, Lyng\aa
11 and BH 217), while the results here derived for the remaining two
clusters (Hogg 15 and Melotte 105) show very good agreement with
previous studies based mainly on colour-magnitude diagrams. We also
provide metallicity estimates for six clusters from the equivalent
widths of CaII triplet and TiO features. The present cluster sample
improves the age resolution around solar metal content in the cluster
spectral library for population synthesis. We compare the properties of
the present sample with those of clusters in similar directions. Hogg 15
and Pismis 21 are among the most reddened clusters in sectors centered
at l = 270o and l = 0o, respectively. Besides, the
present results would favour an important dissolution rate of star
clusters in these zones.