Calcium triplet index in LMC stars : J/AJ/135/836

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Authors : Carrera R. orcid , Gallart C., Hardy E. (hide) , Gallart C., Hardy E. et..al

VizieR DOI : 10.26093/cds/vizier.51350836
Bibcode : 2008AJ....135..836C (ADS) (Simbad) (Objects)
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CDS Keywords : Stars, giant; Magellanic Clouds; Spectra, infrared; Radial velocities; Photometry, VRI
UAT : Giant stars, Magellanic Clouds, Infrared astronomy, Spectroscopy, Radial velocity, Infrared photometry, Optical astronomy, Photometry

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Inserted into VizieR : 21-Jul-2010
Last modification : 06-Aug-2010

The chemical enrichment history of the Large Magellanic Cloud. (2008)

Keywords : galaxies abundances - galaxies: evolution - Magellanic Clouds - galaxies: stellar content

Abstract:Infrared CaII triplet (CaT) spectroscopy has been used to derive stellar metallicities for individual stars in four Large Magellanic Cloud fields situated at galactocentric distances of 3{deg}, 5{deg}, 6{deg}, and 8{deg} to the north of the bar. The combination of spectroscopy with deep CCD photometry has allowed us to break the RGB age-metallicity degeneracy and compute the ages for the objects observed spectroscopically. The obtained age-metallicity relationships (AMRs) for our four fields are statistically indistinguishable. We conclude that the lower mean metallicity in the outermost field is a consequence of it having a lower fraction of intermediate-age stars, which are more metal-rich than the older stars. The disk AMR is ...(more)
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American Astronomical Society policies
The observations were carried out in two different runs, in 2002 December and in 2005 January, at the CTIO 4m telescope with the HYDRA multifiber spectrograph.

  • J/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008)
  • J/AJ/134/1298 : CaII equivalent widths in 29 Galactic clusters (Carrera+, 2007)
  • J/AJ/129/1465 : Spectroscopy of red giants in the LMC bar (Cole+, 2005)
  • J/AJ/120/1808 : Stroemgren photometry in LMC disk (Cole+, 2000)
  • J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998)

                


                

                    

                


                

                    

                


                

                    
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