A New Model for Chemical Evolution of the Galactic Halo: Formulation and Applications

2006 ◽  
pp. 181-182
Author(s):  
Takuji Tsujimoto ◽  
Toshikazu Shigeyama ◽  
Yuzuru Yoshii
Keyword(s):  
Chemical Evolution ◽  
Galactic Halo ◽  
New Model

A New Model for the Evolution of Light Elements in an Inhomogeneous Galactic Halo

2001 ◽  
Vol 549 (1) ◽  
pp. 303-319 ◽  
Author(s):  
Takeru Ken Suzuki ◽  
Yuzuru Yoshii
Keyword(s):  
Galactic Halo ◽  
Light Elements ◽  
New Model

scholarly journals The C/O ratio at low metallicity: constraints on early chemical evolution from observations of Galactic halo stars

2009 ◽  
Vol 500 (3) ◽  
pp. 1143-1155 ◽  
Author(s):  
D. Fabbian ◽  
P. E. Nissen ◽  
M. Asplund ◽  
M. Pettini ◽  
C. Akerman
Keyword(s):  
Chemical Evolution ◽  
Galactic Halo ◽  
Halo Stars ◽  
Low Metallicity

scholarly journals Observed Abundance Features and their Implications for Chemical Evolution

2004 ◽  
Vol 21 (2) ◽  
pp. 242-247
Author(s):  
Takuji Tsujimoto ◽  
Toshikazu Shigeyama
Keyword(s):  
Chemical Evolution ◽  
Globular Cluster ◽  
Milky Way ◽  
Galactic Halo ◽  
Cluster Formation ◽  
Abundance Trends ◽  
Nearby Galaxies ◽  
Star Formation Histories ◽  
Chemical Evolution Model ◽  
Shed Light

AbstractWe describe the star formation histories of the Milky Way dwarf spheroidal galaxy and the globular cluster ω Centauri in terms of an inhomogeneous chemical evolution model developed for the Galactic halo. The observed abundance trends seen in neutron-capture elements together with α-elements constrain our models to shed light on the histories of these nearby galaxies and ω Cen. The origin of low-α stars and a new picture of the globular cluster formation scenario induced by cloud–cloud collisions are also presented.

Two-stage model for chemical evolution of galactic halo

1988 ◽  
Vol 143 (2) ◽  
pp. 257-268 ◽  
Author(s):  
Yasuki Kumai ◽  
Yutaka Sabano ◽  
Makoto Tosa
Keyword(s):  
Chemical Evolution ◽  
Galactic Halo ◽  
Stage Model ◽  
Two Stage

scholarly journals EMP stars with high mass IMF and hierarchical galaxy formation

2009 ◽  
Vol 5 (S265) ◽  
pp. 128-129
Author(s):  
Yutaka Komiya ◽  
Takuma Suda ◽  
Asao Habe ◽  
Masayuki Y. Fujimoto
Keyword(s):  
Chemical Evolution ◽  
Galaxy Formation ◽  
Galactic Halo ◽  
Early Stage ◽  
Mass Function ◽  
Initial Mass Function ◽  
High Mass ◽  
Halo Stars ◽  
The Galaxy ◽  
Metallicity Distribution

AbstractExtremely metal-poor (EMP) stars in the Galactic halo are stars formed in the very early stage of the chemical evolution of the Galaxy. In previous study, we proposed that typical mass of EMP stars are massive, based on observations of carbon-enhanced EMP stars. In this study, we build a merger tree of the Galaxy semi-analytically and follow the chemical evolution along the merger tree. We also consider the effect of binary and high-mass initial mass function(IMF). Resultant theoretical metallicity distribution function (MDF) and abundance distribution are compared with observed metal-poor halo stars.

Lifting the Veil on Ultra Metal-Poor Stars in the Outermost Halo

2017 ◽  
Vol 13 (S334) ◽  
pp. 389-390
Author(s):  
Jinmi Yoon ◽  
Devin D. Whitten ◽  
Timothy C. Beers ◽  
Vinicius M. Placco ◽  
Young Sun Lee ◽  
...  
Keyword(s):  
Early Universe ◽  
Chemical Evolution ◽  
Galactic Halo ◽  
Mass Function ◽  
Initial Mass Function ◽  
Theoretical Studies ◽  
The Past ◽  
Large Numbers ◽  
The Galaxy ◽  
The Veil

AbstractThe study of extremely metal-poor (EMP; [Fe/H] <−3.0) and ultra metal-poor (UMP; [Fe/H] <−4.0) stars is crucial for better understanding first-star nucleosynthesis and constraining the initial mass function in the early Universe. However, UMP stars discovered in the past 25 years only number ~25. A few recent theoretical studies have pointed out that there is likely to exist large numbers of EMP and UMP stars in the periphery of the Galactic halo, at distances exceeding 30-50 kpc. We present identifications of several new EMP/UMP stars and introduce a survey to expedite discovering hundreds to thousands of EMP/UMP stars in the outermost halo (as well as in the local volume) over the next few years, which could revolutionize chemical-evolution studies of the Galaxy.

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