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Different Laws of Increasing of Stellar Dispersion: Observational Flaws or Natural Property of Stellar Population?

Published online by Cambridge University Press:  25 May 2016

A.M. Fridman ,
O.V. Khoruzhii  and
A.E. Piskunov
A.M. Fridman
Affiliation:
Institute of Astronomy, Russian Academy of Sciences 48 Pyatnitskaya St., Moscow, 109017, Russia
O.V. Khoruzhii
Affiliation:
Institute of Astronomy, Russian Academy of Sciences 48 Pyatnitskaya St., Moscow, 109017, Russia
A.E. Piskunov
Affiliation:
Institute of Astronomy, Russian Academy of Sciences 48 Pyatnitskaya St., Moscow, 109017, Russia

Abstract

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Observations show that in the solar neighborhood the velocity dispersions of disk stars increase with their age. In this work we present the results of a critical analysis of the existing interpretations of the data, as well as of previous theoretical explanations of the heating phenomenon. It is shown that different relaxation mechanisms based on star-cloud collisions can result in a wide set of age–velocity dispersion relations (AVDR). Thus the observed differing power laws of the heating of the stellar component can be a consequence of the different relaxation mechanisms.

Type
Chapter 5: How Did the Milky Way Form?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 433 - 434
Copyright
Copyright © Kluwer 1996 

References

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