scholarly journals STAR FORMATION HISTORY AND CHEMICAL EVOLUTION OF THE SEXTANS DWARF SPHEROIDAL GALAXY

2009 ◽  
Vol 703 (1) ◽  
pp. 692-701 ◽  
Author(s):  
Myung Gyoon Lee ◽  
In-Soo Yuk ◽  
Hong Soo Park ◽  
Jason Harris ◽  
Dennis Zaritsky
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Star Formation History ◽  
Formation History

scholarly journals Dynamical and Chemical Evolution of IZw18

2004 ◽  
Vol 21 (2) ◽  
pp. 157-160
Author(s):  
Simone Recchi
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Dwarf Galaxy ◽  
Star Formation History ◽  
Intermediate Mass ◽  
Intermediate Mass Stars ◽  
Formation History ◽  
Type Ia ◽  
Ia Supernovae ◽  
Detailed Chemical

AbstractWe study the effect of different star formation regimes on the dynamical and chemical evolution of IZw18, the most metal-poor dwarf galaxy locally known. To do that we adopt a two-dimensional hydrocode coupled with detailed chemical yields originating from Type II and Type Ia supernovae and from intermediate-mass stars. Particular emphasis is devoted to the problem of mixing of metals. We conclude that, under particular conditions, cooling of metals occurs with a timescale of the order of 10 Myr, thus confirming the hypothesis of instantaneous mixing adopted in chemical evolution models. We try to draw conclusions about the star formation history and the age of the last burst in IZw18.

scholarly journals The LMC Centre Unfolding

1999 ◽  
Vol 190 ◽  
pp. 357-358 ◽  
Author(s):  
A. Ardeberg ◽  
P. Linde ◽  
B. Gustafsson
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Star Formation History ◽  
Formation History

We study star formation history and chemical evolution in the LMC Bar centre. With the HST PC and WFC plus uvby photometry, we find 30% of the stars younger than 200 My and evidence for reduced star formation 3 to 0.2 Gy ago. The overall [Fe/H] is −0.5. Many stars older than 4 Gy contradict a very young Bar.

scholarly journals A Comparison of Chemical Evolution between the Milky Way and M31 Galaxy

2006 ◽  
Vol 2 (S235) ◽  
pp. 313-313
Author(s):  
J. Yin ◽  
J.L. Hou ◽  
R.X. Chang ◽  
S. Boissier ◽  
N. Prantzos
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Milky Way ◽  
Local Group ◽  
Spiral Galaxies ◽  
Star Formation History ◽  
Milky Way Galaxy ◽  
Andromeda Galaxy ◽  
Formation History ◽  
Formation And Evolution

Andromeda galaxy (M31,NGC224) is the biggest spiral in the Local Group. By studying the star formation history(SFH) and chemical evolution of M31, and comparing with the Milky Way Galaxy, we are able to understand more about the formation and evolution of spiral galaxies.

scholarly journals SMART for the Next Decade

2009 ◽  
Vol 5 (S262) ◽  
pp. 291-294
Author(s):  
Myung Gyoon Lee ◽  
In-Soo Yuk ◽  
Sungsoon Lim
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Star Formation History ◽  
Formation History

AbstractSMART is a model to derive both star formation history and chemical evolution simultaneously from color-magnitude diagrams of resolved stars in a galaxy. We present current progress and discuss the prospects of SMART for the next decade.

scholarly journals Stellar Populations in High-z Galaxy Mergers

1999 ◽  
Vol 186 ◽  
pp. 202-202
Author(s):  
Yasuhiro Shioya ◽  
Kenji Bekki
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Stellar Populations ◽  
Star Formation History ◽  
Galaxy Mergers ◽  
Formation History ◽  
Self Consistent ◽  
Consistent Manner ◽  
History Of ◽  
The Difference

We investigate the nature of stellar populations of major galaxy mergers between late-type spirals considerably abundant in interstellar medium by performing numerical simulations designed to solve both the dynamical and chemical evolution in a self-consistent manner. We particularly consider that the star formation history of galaxy mergers is a crucial determinant for the nature of stellar populations of merger remnants, and therefore investigate how the difference in star formation history between galaxy mergers affects the chemical evolution of galaxy mergers.

A unified construction of stellar evolution and chemical evolution models for the multiple populations in globular clusters

2019 ◽  
Vol 14 (S351) ◽  
pp. 302-304
Author(s):  
Sohee Jang ◽  
Jenny J. Kim ◽  
Young-Wook Lee
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Globular Clusters ◽  
Evolution Model ◽  
Star Formation History ◽  
Multiple Populations ◽  
Rr Lyrae ◽  
Formation History ◽  
Type Ab ◽  
Chemical Evolution Model

AbstractRecent investigations of multiple stellar populations in globular clusters (GCs) suggest that the horizontal-branch (HB) morphology and mean period of type ab RR Lyrae variables are mostly sensitive to helium abundance, while the star formation timescale has the greatest effect on our chemical evolution model constructed to reproduce the Na-O anti-correlation of GCs. Therefore, by combining the results from synthetic HB model with those from chemical evolution model, we could put better constraints on star formation history and chemical evolution in GCs with multiple populations. From such efforts made for four GCs, M4, M5, M15, and M80, we find that consistent results can be obtained from these two independent models.

scholarly journals THE STAR FORMATION HISTORY AND CHEMICAL EVOLUTION OF STAR-FORMING GALAXIES IN THE NEARBY UNIVERSE

2012 ◽  
Vol 754 (2) ◽  
pp. 144 ◽  
Author(s):  
J. P. Torres-Papaqui ◽  
R. Coziol ◽  
R. A. Ortega-Minakata ◽  
D. M. Neri-Larios
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Star Formation History ◽  
Star Forming ◽  
Formation History

scholarly journals Evolution of Metals and Stars in Damped Lyman-Alpha Galaxies

2005 ◽  
Vol 13 ◽  
pp. 566-571
Author(s):  
Varsha P. Kulkarni
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Current Data ◽  
Star Formation History ◽  
Lyman Alpha ◽  
Quasar Spectra ◽  
Formation History ◽  
Age Of The Universe ◽  
Line Imaging ◽  
The Universe

AbstractDamped Lyman-alpha absorbers in quasar spectra provide a unique tool to directly measure the abundances of elements in galaxies at red-shifts 0 < z < 5, and hence probe the chemical evolution of galaxies over > 90% of the age of the Universe. Since cosmic chemical evolution models predict the global metallicity of galaxies to increase with time, it is of great interest to determine whether DLAs actually show such a trend. We discuss statistical analysis of existing DLA Zn data to examine the metallicity-redshift relation, and a comparison of the observed data with models of cosmic chemical evolution. We also describe efforts to expand the DLA abundance sample at z < 1.5, where the current data are particularly sparse. Finally, we discuss emission-line imaging studies of the absorber galaxies and compare constraints on their star formation rates with models based on the global star formation history.

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