Stellar Populations
Related Category: Astronomy: General
two broadly contrasting distributions of star types that are characteristic of different parts of a galaxy.
stellar populations
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Stellar Populations
type I: metal-rich (2-3%) disk stars which formed from material enriched with metals from a previous star-forming generation. type II: metal-poor (0.001-0.1%) halo stars.
STELLAR POPULATIONS
Aside from their shapes, the three components of the Galaxy"disk, bulge, and halo"have several other properties that distinguish them from one another.
STELLAR POPULATIONS
In the 1940s, elliptical galaxies were assigned by Walter Baade to his Population II, ...
Stellar populations in galaxies - resolved systems
Jan 31
Stellar populations in galaxies - integrated light ...
Stellar Populations
Milky Way at Many Wavelengths
The Milky Way - Cambridge
Galaxy Types ...
Stellar populations are categorized as I, II, and III, according to the order in which the groups were first recognized, with each succeeding group having decreasing metal content.
Stellar Populations :
Pop I : young, disk, enriched by heavy elements
Pop II : old, halo, depleted in heavy elements
Galaxy Formation : ...
Apart from being kinematically distinct, the thick and thin disks also differ in their stellar populations. Thin disks contain young stars, while the stars in thick disks are almost all older than 10 billion years.
Some globular clusters, like Omega Centauri in our Milky Way and G1 in M31, are extraordinarily massive (several million solar masses) containing multiple stellar populations.
The Hubble images, taken with the Advanced Camera for Surveys, identify three stellar populations in the SMC and in the region of the NGC 346 nebula -- a total of 70,000 stars. The oldest population is 4.5 billion years, roughly the age of our Sun.
Globular One (or G1) has several stellar populations and a structure too massive for an ordinary globular. As a result, some consider G1 to be the remnant core of a dwarf galaxy that was consumed by M31 in the distant past.
"Using observations with the Spitzer Space Telescope, we are able to get a complete census of the stellar populations in the LMC," says Deputy Director Bob Blum.
From there, we spend time talking about the details of stars and stellar populations, as in Populations I, II, and III stars, the various evolutionary stages of stars, and finally, the very diverse field of variable stars and variable star research.
Both the differing age and chemical properties of the stellar populations suggests that the formation scenarios for the thin and thick disks were different.
Used in reference to stars, or stellar populations, which are richer in metals than the Hyades.
Supermultiplet
A multiplet of multiplets.
Also, the structure of the Milky Way Galaxy, our place in it, and how we determine these things. The rotation curve and the existence of the dark matter halo, stellar populations, and the galactic center are also discussed.
has a population of stars of different temperatures, gravities, and chemical abundances (from old M dwarfs that have been around for billions of years to O stars that were borne yesterday). You need a pretty good idea of the stellar populations ...
of complex Earth-type life over the past eight to four billion years for evolutionary development (press release; and Lineweaver et al, 2004, in pdf). (Further discussion of the different galactic regions and their distinctive stellar populations is ...
 See also: Population, Stellar population, Galaxy, Galaxies, Cluster
  
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