منابع مشابه
Galactic Structure and Stellar Populations
The Milky Way Galaxy offers a unique opportunity for testing theories of galaxy formation and evolution. I discuss how large surveys, both photometric and spectroscopic, of Galactic stars are the keystones of investigations into such fundamental problems as the merging history – and future – of the Galaxy.
متن کاملGalactic Stellar Populations
The history of the formation and evolution of the Milky Way Galaxy is found in the spatial distribution, kinematics, age and chemical abundance distributions of long-lived stars. From this fossil record one can in principle extract the star formation histories of different components, their chemical evolution, the stellar Initial Mass Function, the merging history – what merged and when did it ...
متن کاملStellar populations in active galactic nuclei
The relationship of an AGN to its host galaxy is one crucial question in the study of galaxy evolution. We present a method to estimate the stellar contribution in active galactic nuclei. We perform stellar population synthesis in the central regions of a sample of 12 galaxies of different levels of activity: normal galaxies, starburst galaxies, LINERs, Seyfert 2 and Seyfert 1 galaxies. Quantif...
متن کاملThe Galactic Bulge: the Stellar and Planetary Nebulae Populations
We compare abundances patterns in the Bulge for elements observed in stars and in planetary nebulae. Some α elements, like Mg and Ti, are overabundant in respect to Fe, and others are not, like He, O, Si, S, Ar, Ca. The first ones favor a quick evolution of the Galactic Bulge, and the seconds a much slower one.
متن کاملRadial Structure of Galactic Stellar Disks
We present the results from our deep optical imaging survey µ V lim ≈ 26 − 27 mag/ 2 ′′ of a morphologically selected sample of 72 edge-on disk galaxies. The question of the global structure of galactic stellar disks, especially the radial surface brightness profile at large galactocen-tric distances, is addressed. We find that typical radial profiles are better described by a two-slope exponen...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1995
ISSN: 0004-6280,1538-3873
DOI: 10.1086/133624