variables, high-velocity stars, and certain other rarer objects. As time progressed, it was possible for astronomers to subdivide the different populations in the Galaxy further. These subdivisions ranged from the nearly spherical “halo Population II” system to the very thin “extreme Population I...
Milky Way Galaxy- the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky Milky Way,Milky Way System extragalactic nebula,galaxy- (astronomy) a collection of star systems; any of the billions of systems...
Milky Way Galaxy - Structure, Dynamics, Stars: The first reliable measurement of the size of the Galaxy was made in 1917 by American astronomer Harlow Shapley. He arrived at his size determination by establishing the spatial distribution of globular clus
stars: horizontal-branchWe develop statistical methods for identifying star streams in the halo of the Milky Way galaxy that exploit observed spatial and radial velocity distributions. Within a great circle, departures of the observed spatial distribution from random provide a measure of the likelihood...
The structure of the Milky Way The Milky Way is composed of three main parts: a central bulge, a relatively flat disk and a roughly spherical surrounding halo. The halo consists of globular clusters— densely packed conglomerations of hundreds of thousands or millions of stars — as well as ...
Surrounding the galaxy is a large spherical halo of globularstar clustersand individual stars that extends to a diameter of about 130,000 light-years; this is called the stellar halo. The galaxy also has a vast outer spherical region called the corona, or dark halo, which is as much as 1....
These stars mayhave been forced to leave from a neighboring galaxy.It's also possible that they come from anothergalaxy, and actually they are Milky Way halo stars thatwere tossed about during ancient interaction with oneof the Milky Way's tiny satellite galaxies(卫星星系)According to the ...
Mysteries of the Milky Way, ArtículoHalo stars from the outer parts of our Galaxy may have been there since the galaxy began, or they may be remnants of satellite galaxies that were captured by the Milky Way. A detailed chemical analysis of such distant stars finds that they are ...
being bound stellar systems dominated by dark matter but, in fact, stellar streams in formation, shedding their stars in the Milky Way's stellar halo.do... M Koleva,P Prugniel,I Vauglin,... - 《Astrophysical Journal》 被引量: 22发表: 2010年 Stellar Archaeology in the Milky Way Halo:...
Galaxy: haloGalaxy: kinematicsGalaxy: structurestars: variables: otherWe study the distribution of radial velocities of RR Lyrae stars in the same region of the sky where a large overdensity of main sequence stars have been detected by SDSS. Our results indicate that several independent stellar ...