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The origin of low [alpha/Fe] ratios in extremely metal-poor stars
- Publication Year :
- 2014
-
Abstract
- We show that the low ratios of $\alpha$ elements (Mg, Si, and Ca) to Fe recently found for a small fraction of extremely metal-poor stars can be naturally explained with the nucleosynthesis yields of core-collapse supernovae, i.e., $13-25M_\odot$ supernovae, or hypernovae. For the case without carbon enhancement, the ejected iron mass is normal, consistent with observed light curves and spectra of nearby supernovae. On the other hand, the carbon enhancement requires much smaller iron production, and the low [$\alpha$/Fe] of carbon enhanced metal-poor stars can also be reproduced with $13-25M_\odot$ faint supernovae or faint hypernovae. Iron-peak element abundances, in particular Zn abundances, are important to put further constraints on the enrichment sources from galactic archaeology surveys.<br />Comment: Accepted for publication in ApJ Letter, 7 pages, 2 figures
- Subjects :
- Physics
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
chemistry.chemical_element
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Light curve
Astrophysics - Astrophysics of Galaxies
Spectral line
Metal
Supernova
Stars
chemistry
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Nucleosynthesis
Astrophysics of Galaxies (astro-ph.GA)
visual_art
visual_art.visual_art_medium
Astrophysics::Solar and Stellar Astrophysics
Hypernova
Carbon
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....3704e939b4a693fa810ae20efbe740f5