He-rich and He-poor populations in RGB stars. Results on a sample of 19 globular clusters

Angela Bragaglia*, Valentina D'Orazi, Raffaele G. Gratton, Eugenio Carretta, Santi Cassisi, Sara Lucatello

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

We use about 1400 led giant branch stars observed in 19 Galactic Globular Clusters (GCs) to compare colours, metallicities, and RGB bump luininosities of stars assigned to first and second generations We find subtle differences which we attribute to the different Ho content In gem:tat these differences are visible only when we consider the extreme second generation stars. with the exception of NGC 2808 When using various indicators, the implied helium enhancements am similar, but the absolute calibration is still uncertain

Original languageEnglish
Title of host publicationLight elements in the universe
EditorsC Charbonnel, M Tosi, F Primas, C Chiappini
Place of PublicationCambridge
PublisherCambridge University Press
Pages169-170
Number of pages2
Volume5
EditionS268
ISBN (Print)978-0-521-76506-0
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event268th Symposium of the International-Astronomical-Union - Geneva, Switzerland
Duration: 9 Nov 200913 Nov 2009

Publication series

NameIAU Symposium Proceedings Series
PublisherCAMBRIDGE UNIV PRESS
Volume5
ISSN (Print)1743-9213

Conference

Conference268th Symposium of the International-Astronomical-Union
CountrySwitzerland
CityGeneva
Period9/11/0913/11/09

Keywords

  • Stars abundances
  • Population II - Galaxy globular clusters
  • STELLAR EVOLUTION DATABASE
  • ISOCHRONES
  • MODELS

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