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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27948
Title: Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters
Authors: Vásquez, S.
Saviane, I.
HELD, Enrico Valerio 
Da Costa, G. S.
Dias, B.
GULLIEUSZIK, MARCO 
Barbuy, B.
Ortolani, S.
Zoccali, M.
Issue Date: 2018
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 619
First Page: 1
Abstract: Although the globular clusters in the Milky Way have been studied for a long time, a significant fraction of them lack homogeneous metallicity and radial velocity measurements. In an earlier paper we presented the first part of a project to obtain metallicities and radial velocities of Galactic globular clusters from multiobject spectroscopy of their member stars using the ESO Very Large Telescope. In this paper we add metallicities and radial velocities for a new sample of 28 globular clusters, including in particular globular clusters in the MW halo and the Galactic bulge. Together with our previous results, this study brings the number of globular clusters with homogeneous measurements to ∼69% of those listed in the Harris' catalogue. As in our previous work, we have used the Ca II triplet lines to derive metallicities and radial velocities. For most of the clusters in this study, this is the first analysis based on spectroscopy of individual member stars. The metallicities derived from the Ca II triplet are then compared to the results of our parallel study based on spectral fitting in the optical region and the implications for different calibrations of the Ca II triplet line strengths are discussed. We also comment on some interesting clusters and investigate the presence of an abundance spread in the globular clusters here. A hint of a possible intrinsic spread is found for NGC 6256, which therefore appears to be a good candidate for further study. <P />Based on observations taken with ESO telescopes at the La Silla Paranal Observatory under programme ID 089.D-0493(B).Full Table 3 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/619/A13">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/619/A13
URI: http://hdl.handle.net/20.500.12386/27948
URL: https://www.aanda.org/articles/aa/abs/2018/11/aa33525-18/aa33525-18.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201833525
Bibcode ADS: 2018A&A...619A..13V
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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