the latter being much older than the former.These groups can also be distinguished by their locations.Our galaxy, the Milky Way, is shaped like a flat disk surrounding a central bulge.Whereas Population I stars are found mainly in the galactic disk, Population II stars mostly reside in the ...
Whereas Population I stars are found mainly in the galactic disk, Population II stars mostly reside in the central bulge of the galaxy and in the halo surrounding this bulge.Population II stars date to the early stages of the universe. Formed when the cosmos was filled with hydrogen and ...
Population I consists of younger metal-rich hot white stars, many occurring in galactic clusters and forming the arms of spiral galaxies. Stars of population II are older, the brightest being red giants, and are found in the centre of spiral and elliptical galaxies in globular clusters 7. (...
population I stars are the young metal-rich highly luminous stars found in spiral arms of galaxies – i.e. strongly concentrated in the galactic plane – and associated with interstellar gas and dust. In contrast population II stars are old red stars found throughout elliptical and lenticular ...
Either of two classes of stars, termed population I and population II; population I are relatively young stars, found in the arms of spiral galaxies, especially the blue stars of high luminosity; population II stars are the much older, more evolved stars of lower metallic content; many high ...
Population I stars are younger and more metal-rich stars that are typically found in the disk of galaxies. They are characterized by their association with ongoing star formation and are known for their higher metal content compared to Population II stars. ...
The use of Population I pulsating stars in star clusters and associations is one of the simplest and most easily applied methods for determining cluster ages; but there are some limitations in its application.doi:10.1007/BF00643629Ts. G. Tsvetkov...
The use of Population I pulsating stars in star clusters and associations is one of the simplest and most easily applied methods for determining cluster ages; but there are some limitations in its application. Part 6 展开 DOI: 10.1007/BF00643628 被引量: 13 ...
24.In the dark night,(billion) of stars and the moon light the sky. 25.One third of the land in that town(be) full of trees and grass. 26.One(six) of my classmates go to school by bus every day. 27.Mike invited me to his birthday party, but I refused (拒绝) politely at onc...
An analysis of some photometric and kinematic data for nearby Population I stars has been carried out. The main results show that a good correlation exists between the dynamic state and age; but a non-negligible chemical inhomogeneity seems to be present in the disk, independently of the age....