Measuring helium abundance difference in giants of NGC 2808

2011/05/02 by L. Pasquini, P. Mauas, P. J. D. Mauas +3 · 1 citation
Physics and Astronomy · #Abundance (ecology) #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Atomic physics #Biology #Chromosphere #Emission spectrum #Equivalent width #Giant star #Globular cluster #Helium #Line (geometry) #Metallicity #Physics #Spectral line #Stars #Stellar, planetary, and galactic studies #astro-ph.SR

paper · pdf · doi:10.1051/0004-6361/201116592

Accepted for publication in A&A

arxiv created 2011/05/02 · openalex publication_date 2011/05/03 · arxiv updated 2015/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Context. Multiple populations have been detected in several globular clusters (GC) that do not display a spread in metallicity. Unusual features of their observed colour–magnitude diagrams (CMD) can be interpreted in terms of differences in the helium content of the stars belonging to the sub-populations.

Citations

• A Triple Main Sequence in the Globular Cluster NGC 2808
• Star-to-Star Na and O Abundance Variations along the Red Giant Branch in NGC 2808
• Metallicities on the Double Main Sequence of ω Centauri Imply Large Helium Enhancement
• The fraction of second generation stars in globular clusters from the analysis of the horizontal branch★
• Mass motions and chromospheres of RGB stars in the globular cluster NGC 2808

Cited by

• Multiple Stellar Populations and Their Evolution in Globular Clusters: A Nucleosynthesis Perspective