Horizontal branch stars in NGC 1851

DOI

The chemical composition of horizontal branch (HB) stars might help to clarify the formation history of individual globular clusters (GCs). We studied the Na-O anti-correlation from moderately high resolution spectra for 91 stars on the bimodal HB of NGC 1851; in addition we observed 13 stars on the lower red giant branch (RGB). In our HB sample, 35 stars are on the blue HB (BHB), one is an RR Lyrae, and 55 stars are on the red HB (RHB). The ratio of BHB to RHB stars is close to the total in the cluster (35 and 54%, respectively), while RR Lyrae variables are under-represented, (they are ~12% of the NGC 1851 stars). We also derived abundances for He and N in BHB stars.

Cone search capability for table J/A+A/539/A19/stars (Program stars: basic data (table1), atmospheric parameters and Fe abundances (table2))

Identifier
DOI http://doi.org/10.26093/cds/vizier.35390019
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/539/A19
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/539/A19
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/539/A19
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/A+A/539/A19
Provenance
Creator Gratton R.G.; Lucatello S.; Carretta E.; Bragaglia A.; D'orazi V.,Al Momany Y.; Sollima A.; Salaris M.; Cassisi S.
Publisher CDS
Publication Year 2012
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Interdisciplinary Astronomy; Natural Sciences; Physics; Stellar Astronomy