Galactic Astronomy pdf free download. Moving away from the solar neighbourhood, the properties of stars begin to change. A useful characterisation of these changes is called the population concept. Stars are found to broadly belong to two population types. The concept was proposed by Walter Baade in 1944. Baade noticed in studies of the nearby spiral galaxy M31 that the disk stars in M31 were like nearby disk stars in young associations in the Galaxy, while the bulge stars mere nearly resembled those of the Galaxy’s globular clusters. Young, metal rich stars rotating with the disk of the Galaxy are termed Population I, while old, metal weak stars are termed Population II.
Galactic Astronomy pdf free download
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