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Chemical Properties and Age of the Components of the Galactic Halo

Published online by Cambridge University Press:  12 April 2016

Vittorio Castellani
Vittorio Castellani*
Affiliation:
Istituto di Astronomia, Università di Roma, Italia and Laboratorio di Astrofisica Spaziale (CNR), Frascati, Italia

Extract

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What we call Population II is composed by the stars populating the halo of our Galaxy, for which one finds evidences for an underabundance in the heavy elements and/or for an evolutionary age as large as (roughly) 1010 years. Similar star populations are at present recognized in the halo of other spyral galaxies, in elliptical galaxies as well as in smaller systems, such as the Magellanic Clouds and the so-called Dwarf Galaxies as the ones in Draco and in Ursa Minor. Then Population II looks like representing a very general constituent of present Universe.

Type
Part III: The Chemical Properties of the Disc and the Halo in our Galaxy
Information
International Astronomical Union Colloquium , Volume 45: Chemical and Dynamical Evolution of our Galaxy , September 1977 , pp. 133 - 147
Copyright
Copyright © Geneva Observatory 1977

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