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II. The Galaxy

The galactic disk

Published online by Cambridge University Press:  14 August 2015

G. Larsson-Leander

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According to the general evolutionary ideas outlined in section (A), p. 13 above, we should find in the disk both old objects, formed immediately after the contraction of the primeval cloud into the disk, and recently formed stars. The study of the interarm population of our Galaxy is a difficult problem due to the interstellar absorption. Information from nearby galaxies, especially from M 31, is in some ways more readily obtainable. In the disk of M 31 we find stars of absolute magnitude about – 3 photovisual, which are similar to the brightest stars observed in globular clusters. Observations with the 200-inch telescope have shown that the number of these stars of population II decreases rapidly from the nucleus to the adjacent regions, and then slower towards the limit to which the system can be traced by optical means.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 7: Second Conference on co-ordination of Galactic Research , 1959 , pp. 33 - 40
Copyright
Copyright © Cambridge University Press 1959 

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