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How do the Stellar Disc and Thick Disc Stop?

Published online by Cambridge University Press:  25 May 2016

A.C. Robin ,
M. Crézé  and
V. Mohan
A.C. Robin
Affiliation:
Observatoire de Besançon, (robin@obs-besancon.fr)
M. Crézé
Affiliation:
Observatoire de Strasbourg, (creze@simbad.u-strasbg.fr)
V. Mohan
Affiliation:
U.P.S.O., Manora Peak, Nainital, 263129 India

Abstract

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As part of a stellar population sampling program, a series of photometric probes at various field sizes and depths have been obtained in a low extinction window in the galactic anticentre direction. Very deep CCD frames probe the most external parts of the disc, providing strong evidence that the galactic density scale length for the old disc population is rather short (2.5 kpc) and drops abruptly beyond 5.5-6 kpc.

Deeper frames in the I band allow to estimate photometric distances and confirm the position of the disk edge. A few stars are found at larger distances. Their number is exactly what we expect if the thick disk does not have any cutoff. We discuss the implications for the formation and evolution of the disc, for the star formation threshold, and for the origin of the thick disc population.

Type
Chapter 8: How do we put it together?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 681 - 687
Copyright
Copyright © Kluwer 1996 

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