The Chemical Composition of Local Group Dwarf Spheroidals
نویسنده
چکیده
I will review the progress of VLT spectroscopy of large numbers of individual stars in nearby dwarf spheroidal galaxies. This spectroscopy has allowed us to obtain detailed insights into the chemical and dynamical properties of the resolved stellar population in these nearby systems.
منابع مشابه
Cosmological Implications of Dwarf Spheroidal Chemical Evolution
The chemical properties of dwarf spheroidals in the local group are shown to be inconsistent with star formation being truncated after the reionization epoch (z∼ 8). Enhanced levels of [Ba/Y] in stars in dwarf spheroidals like Sculptor indicate strong s-process production from low-mass stars whose lifetimes are comparable with the duration of the pre-reionization epoch. The chemical evolution o...
متن کاملA common trend in the chemical evolution of Local Group dwarf spheroidals and Damped Lyα systems
We compare chemical abundances of Local Group dwarf spheroidals, obtained from recent UVES/VLT observations, and of high redshift Damped Lyman α systems (DLAs), corrected for dust effects. We focus, in particular, on the abundance ratio between αcapture elements and iron, α/Fe, a well known indicator of chemical evolution. Comparison of the data in the plane α/Fe versus Fe/H shows a remarkable ...
متن کاملThe counterparts of Local Group dwarf spheroidals in nearby clusters
In this contribution, we report on the discovery of dwarf spheroidals (dSphs) in the core of the Fornax cluster. Their photometric properties – like magnitude, colour, surface brightness – are very similar to those of Local Group dSphs. However, at a given total magnitude, dSphs in Fornax seem to be more extended than their Local Group counterparts. The membership of several dwarf galaxy candid...
متن کاملUpdated Information on the Local Group
The present note updates the information published in my recent monograph on The Galaxies of the Local Group. Highlights include (1) the addition of the newly discovered Cetus dwarf spheroidal as a certain member of the Local Group, (2) an improved distance for SagDIG, which now places this object very close to the edge of the Local Group zero-velocity surface, (3) more information on the evolu...
متن کاملUpdated Information on the Local Group
The present note updates the information published in my recent monograph on The Galaxies of the Local Group. Highlights include (1) the addition of the newly discovered Cetus dwarf spheroidal as a certain member of the Local Group, (2) an improved distance for SagDIG, which now places this object very close to the edge of the Local Group zero-velocity surface, (3) more information on the evolu...
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تاریخ انتشار 2005