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- W586020217 abstract "We investigate the frequency and origin of carbon-enhanced metal-poor (CEMP) stars in Local Group dwarf galaxies by means of a statistical, data-calibrated cosmological model for the hierarchical build-up of the Milky Way and its dwarf satellites. The model self-consistently explains the variation with dwarf galaxy luminosity of the observed: i) frequency and [Fe/H] range of CEMP stars; ii) metallicity distribution functions; iii) star formation histories. We show that if primordial faint supernovae dominated the early metal enrichment, then CEMP-no stars enriched by the first stellar generations should be present in all dwarf galaxies, with similar number of stars and CEMP fractions at [Fe/H]$< -4$. We demonstrate that the probability to observe a star that is carbon-enhanced within a given [Fe/H] range strongly depends on the luminosity of the dwarf galaxy and, on average, it is an order of magnitude lower in classical Sculptor-like dSph galaxies ($Pleq 0.02$) than in the least luminous ultra-faint dwarfs ($P approx 0.1$). In addition, we explain why it may be easier to find CEMP-no stars at [Fe/H]$approx -2$ in classical dSph galaxies than in ultra-faint dwarfs. These are consequences of the dramatic variation in the fraction of stars at [Fe/H]$<-3$ with galaxy luminosity: $geq 40%$ for galaxies with $L<10^5L_{odot}$, and $leq 0.2%$ for $L>10^{7}L_{odot}$. We present model predictions for the low Fe-tail and CEMP fraction of stars in dwarf galaxies, with particular emphasis on the Sculptor dSph, that can be used to shed light on the properties of the first stars." @default.
- W586020217 created "2016-06-24" @default.
- W586020217 creator A5026897481 @default.
- W586020217 creator A5063592802 @default.
- W586020217 creator A5088467344 @default.
- W586020217 date "2015-10-01" @default.
- W586020217 modified "2023-10-10" @default.
- W586020217 title "Carbon-enhanced metal-poor stars in dwarf galaxies" @default.
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