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The Existence of Moving Groups and the Disk Heating Problem

Published online by Cambridge University Press:  25 May 2016

B. Chen ,
F. Figueras ,
J. Torra ,
R. Asiain  and
C. Jordi
B. Chen
Affiliation:
Departament d'Astronomia i Meteorologia, Av. Diagonal 647, E-08028 Barcelona, Spain
F. Figueras
Affiliation:
Departament d'Astronomia i Meteorologia, Av. Diagonal 647, E-08028 Barcelona, Spain
J. Torra
Affiliation:
Departament d'Astronomia i Meteorologia, Av. Diagonal 647, E-08028 Barcelona, Spain
R. Asiain
Affiliation:
Departament d'Astronomia i Meteorologia, Av. Diagonal 647, E-08028 Barcelona, Spain
C. Jordi
Affiliation:
Departament d'Astronomia i Meteorologia, Av. Diagonal 647, E-08028 Barcelona, Spain

Abstract

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A powerful moving group-finding algorithm has been developed and applied to a large sample of B, A and F main sequence stars from the Hipparcos Input Catalogue. Four moving groups near the Sun (Pleiades, Sirius, IC2391 and Hyades) have been identified without assuming any a priori knowledge of the properties of moving groups. This is the most convincing objective evidence for their existence. After the members of the moving groups are removed from the sample, we investigate the disk heating problem. The results show that the velocity dispersion of the local disk stars increases with age, roughly as ≃ ∞ τ1/5.

Type
Chapter 6: How are we to Understand the Large Scale Structure of the ISM?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 513 - 514
Copyright
Copyright © Kluwer 1996 

References

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