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 language | English |
|---|---|
| Article number | L43 |
| Journal | Astrophysical Journal Letters |
| Volume | 813 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2015 Nov 10 |
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All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
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Evidence for enrichment by supernovae in the globular cluster NGC 6273. / Han, Sang Il; Lim, Dongwook; Seo, Hyunju; Lee, Young Wook.
In: Astrophysical Journal Letters, Vol. 813, No. 2, L43, 10.11.2015.Research output: Contribution to journal › Article
TY - JOUR
T1 - Evidence for enrichment by supernovae in the globular cluster NGC 6273
AU - Han, Sang Il
AU - Lim, Dongwook
AU - Seo, Hyunju
AU - Lee, Young Wook
PY - 2015/11/10
Y1 - 2015/11/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84947077534&partnerID=8YFLogxK
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U2 - 10.1088/2041-8205/813/2/L43
DO - 10.1088/2041-8205/813/2/L43
M3 - Article
AN - SCOPUS:84947077534
VL - 813
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L43
ER -