Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2012-04-18
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
5 pages including 3 figures, accepted for publication in ApJ Letters
Scientific paper
Recent spectroscopic observations of globular clusters (GCs) in the Large Magellanic Cloud (LMC) have discovered that one of the intermediate-age GC, NGC 1718 with [Fe/H]=-0.7 has an extremely low [Mg/Fe] ratio of ~-0.9. We propose that NGC 1718 was formed from the ejecta of type Ia supernovae (SNe Ia) mixed with very metal-poor ([Fe/H] <-1.3) gas about ~ 2 Gyr ago. The proposed scenario is shown to be consistent with the observed abundances of Fe-group elements such as Cr, Mn, and Ni. In addition, compelling evidence for asymptotic giant branch stars playing a role in chemical enrichment during this GC formation is found. We suggest that the origin of the metal-poor gas is closely associated with the efficient gas-transfer from the outer gas disk of the Small Magellanic Cloud to the LMC disk. We anticipate that the outer part of the LMC disk contains field stars exhibiting significantly low [Mg/Fe] ratios, formed through the same process as NGC 1718.
Bekki Kenji
Tsujimoto Takuji
No associations
LandOfFree
First Evidence of Globular Cluster Formation from the Ejecta of Prompt Type Ia Supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with First Evidence of Globular Cluster Formation from the Ejecta of Prompt Type Ia Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and First Evidence of Globular Cluster Formation from the Ejecta of Prompt Type Ia Supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-33271