Evidence for enrichment by supernovae in the globular cluster NGC 6273

Sang Il Han, Dongwook Lim, Hyunju Seo, Young Wook Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In our recent investigation, we showed that narrowband photometry can be combined with low-resolution spectroscopy to effectively search for globular clusters (GCs) with supernova (SN) enrichments. Here we apply this technique to the metal-poor bulge GC NGC 6273 and find that the red giant branch stars in this GC are clearly divided into two distinct subpopulations with different calcium abundances. The Ca rich subpopulation in this GC is also enhanced in CN and CH, showing a positive correlation between them. This trend is identical to the result we found in M22, suggesting that this might be a ubiquitous nature of GCs more strongly affected by SNe in their chemical evolution. Our results suggest that NGC 6273 was massive enough to retain SN ejecta, which would place this cluster in the growing group of GCs with Galactic building block characteristics, such as ω Centauri and Terzan 5.

Original languageEnglish
Article numberL43
JournalAstrophysical Journal Letters
Volume813
Issue number2
DOIs
Publication statusPublished - 2015 Nov 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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