Modelling the evolution and nucleosynthesis of carbon-enhanced metal-poor stars
نویسنده
چکیده
We present the results of binary population simulations of carbon-enhanced metalpoor (CEMP) stars. We show that nitrogen and fluorine are useful tracers of the origin of CEMP stars, and conclude that the observed paucity of very nitrogen-rich stars puts strong constraints on possible modifications of the initial mass function at low metallicity. The large number fraction of CEMP stars may instead require much more efficient dredge-up from low-metallicity asymptotic giant branch stars.
منابع مشابه
Binary Populations of Carbon-Enhanced Metal-Poor Stars
We construct binary-star population nucleosynthesis models of carbon-enhanced metal poor (CEMP) stars. We compare the CEMP to EMP (extremely metal poor) ratio of our models to the observed ratio and find it is an order of magnitude too small. Through an increase in the efficiency of third dredge-up in low-mass, low-metallicity thermally-pulsing asymptotic-giant branch (TPAGB) stars our models b...
متن کاملCNO elements
Using the standard infall model of Galactic chemical evolution, we explore the origin of carbon and calculate the abundance evolution of CNO elements for 8 different models of stellar nucleosynthesis yields. The results show that, in the early stage of the Galaxy, massive stars are the main producer of carbon, and that as our Galaxy evolves to the late stage, the longer lived intermediate-and l...
متن کاملChemical Enrichment in the Carbon-enhanced Damped Lyman Α System by the Population Iii Supernovae
We show that the recently observed elemental abundance pattern of the carbon-rich metal-poor Damped Lyman α (DLA) system is in excellent agreement with the nucleosynthesis yields of faint core-collapse supernovae of primordial stars. The observed abundance pattern is not consistent with the nucleosynthesis yields of pair-instability supernovae. The DLA abundance pattern is very similar to that ...
متن کاملNucleosynthesis in Black-Hole-Forming Supernovae and Abundance Patterns of Extremely Metal-Poor Stars
Stars more massive than ∼ 20 25 M⊙ form a black hole at the end of their evolution. Stars with non-rotating black holes are likely to collapse "quietly" ejecting a small amount of heavy elements (Faint supernovae). In contrast, stars with rotating black holes are likely to give rise to very energetic supernovae (Hypernovae). We present distinct nucleosynthesis features of these two types of "bl...
متن کاملA carbon-enhanced metal-poor damped Lyα system: probing gas from Population III nucleosynthesis?
We present high-resolution observations of an extremely metal-poor damped Lyα system (DLA), at zabs = 2.340 0972 in the spectrum of the QSO J0035−0918, exhibiting an abundance pattern consistent with model predictions for the supernova yields of Population III stars. Specifically, this DLA has [Fe/H] −3, shows a clear ‘odd–even’ effect, and is C-rich with [C/Fe] = +1.53, a factor of ∼20 greater...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008