Abundances of red giants in NGC 6752 : J/A+A/464/927

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Authors : Carretta E. orcid , Bragaglia A., Gratton R.G. (hide) , Bragaglia A., Gratton R.G. et..al

VizieR DOI : 10.26093/cds/vizier.34640927
Bibcode : 2007A&A...464..927C (ADS) (Simbad) (Objects)
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CDS Keywords : Clusters, globular; Stars, population II; Abundances; Radial velocities
UAT : Globular star clusters, Population II stars, Chemical abundances, Radial velocity

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Inserted into VizieR : 06-Mar-2007
Last modification : 19-Jun-2017

Na-O Anticorrelation and HB. II. The Na-O anticorrelation in the globular cluster NGC 6752 (2007)

Keywords : stars abundances - stars: atmospheres - stars: Population II - Galaxy: globular clusters: general - Galaxy: globular clusters: individual: NGC 6752

Abstract:We are studying the Na-O anticorrelation in several globular clusters of different Horizontal Branch (HB) morphology in order to derive a possible relation between (primordial) chemical inhomogeneities and morphological parameters of the cluster population. We used the multifiber spectrograph FLAMES on the ESO Very Large Telescope UT2 and derived atmospheric parameters and elemental abundances of Fe, O and Na for about 150 red giant stars in the Galactic globular cluster NGC 6752. The average metallicity we derive is [Fe/H]=-1.56, in agreement with other results from red giants, but lower than obtained for dwarfs or early subgiants. ...(more)
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Astronomy and Astrophysics policies
Spectra for 151 RGB stars in NGC 6752 were obtained with FLAMES@VLT using two gratings (HR11, HR13). Abundances of Fe, O, Na were derived using equivalent widths, model atmospheres and atmospheric parameters based on photometry. For each star we give identification, equatorial coordinates, VBJK magnitudes, S/N, heliocentric radial velocity for both gratings, Teff, logg, [A/H], v_t_, [Fe/H], [O/Fe], [Na/Fe]. Equivalent widths are given in tablea.
Eugenio Carretta, eugenio.carretta(at)oabo.inaf.it

                


                

                    

                


                

                    

                


                

                    
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