Galactic globular clusters with extremely low metallicities

An observational program has been initiated for determining chemical abundances of red giants belonging to galactic globular clusters, whose characteristics (morphology of the horizontal branch, integrated spectral type, ultraviolet excess, etc.) suggest extremely low metallicities. In this study w...

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Detalles Bibliográficos
Autores principales: Clariá, J.J., Geisler, D., Minniti, D.
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1990
Materias:
Astronomía
Galaxia
ngc 104
ngc 2298
ngc 3201
ngc 4372
ngc 4590
ngc 4833
ngc 5897
ngc 5986
ngc 6101
ngc 6144
ngc 6397
ngc 6541
ngc 6752
ngc 6809
ngc 7099
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/142637
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-142637
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
ngc 104
ngc 2298
ngc 3201
ngc 4372
ngc 4590
ngc 4833
ngc 5897
ngc 5986
ngc 6101
ngc 6144
ngc 6397
ngc 6541
ngc 6752
ngc 6809
ngc 7099
spellingShingle Astronomía
Galaxia
ngc 104
ngc 2298
ngc 3201
ngc 4372
ngc 4590
ngc 4833
ngc 5897
ngc 5986
ngc 6101
ngc 6144
ngc 6397
ngc 6541
ngc 6752
ngc 6809
ngc 7099
Clariá, J.J.
Geisler, D.
Minniti, D.
Galactic globular clusters with extremely low metallicities
topic_facet Astronomía
Galaxia
ngc 104
ngc 2298
ngc 3201
ngc 4372
ngc 4590
ngc 4833
ngc 5897
ngc 5986
ngc 6101
ngc 6144
ngc 6397
ngc 6541
ngc 6752
ngc 6809
ngc 7099
description An observational program has been initiated for determining chemical abundances of red giants belonging to galactic globular clusters, whose characteristics (morphology of the horizontal branch, integrated spectral type, ultraviolet excess, etc.) suggest extremely low metallicities. In this study we present some preliminary results obtained at Cerro Tololo Inter-American Observatory from Washington photometry of 165 red giants belonging to 15 globular clusters. The metallicities have been determined using a new empirical calibration recently established by Geisler, Clariá and Minniti (1990), which accounts for the effect of decreasing abundance sensitivity of Δ(C-M) with decreasing temperature. The mean [Fe/H] values obtained for 10 of the 15 clusters range between -2.0 and -3.0. Although preliminary, these values considerably extend the metallicity distribution of the galactic globular cluster system towards values close to -3.0, thus favoring the secondary formation theory of galactic globular clusters.
format Articulo
Comunicacion
author Clariá, J.J.
Geisler, D.
Minniti, D.
author_facet Clariá, J.J.
Geisler, D.
Minniti, D.
author_sort Clariá, J.J.
title Galactic globular clusters with extremely low metallicities
title_short Galactic globular clusters with extremely low metallicities
title_full Galactic globular clusters with extremely low metallicities
title_fullStr Galactic globular clusters with extremely low metallicities
title_full_unstemmed Galactic globular clusters with extremely low metallicities
title_sort galactic globular clusters with extremely low metallicities
publishDate 1990
url http://sedici.unlp.edu.ar/handle/10915/142637
work_keys_str_mv AT clariajj galacticglobularclusterswithextremelylowmetallicities
AT geislerd galacticglobularclusterswithextremelylowmetallicities
AT minnitid galacticglobularclusterswithextremelylowmetallicities
bdutipo_str Repositorios
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