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Structure and Kinematical Properties of the Galaxy at Intermediate Galactic Latitudes

Published online by Cambridge University Press:  25 May 2016

D. K. Ojha ,
O. Bienaymé  and
A. C. Robin
D. K. Ojha
Affiliation:
Institut d'Astrophysique de Paris
O. Bienaymé
Affiliation:
Observatoire de Strasbourg
A. C. Robin
Affiliation:
Observatoire de Besançon

Abstract

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We have carried out a sample survey in UBVR photometry and proper motions in various directions in the Galaxy. Three fields in the direction of galactic anticentre, centre, and antirotation have been surveyed. Using our new data together with wide-area surveys in other fields available to date, we discuss the radial and vertical structure of the Galaxy. Our results confirm that the thick disk population is distinct from other populations based on their kinematical and spatial distribution. The most probable value of scale height for the thick disk component is determined to be hz≃760±50 pc and a local density of ≃7.4+2.5−1.5% relative to the thin disk. The ratio of the number of thick disk stars in our galactic centre region to that in anticentre region yield hR≃3±1 kpc for the scale length of thick disk. These values are in perfect agreement with the recent determination given by Robin et al. (1996).

Type
Part 4. Galactic Structure
Information
Symposium - International Astronomical Union , Volume 179: New Horizons from Multi-Wavelength Sky Surveys , 1998 , pp. 221 - 222
Copyright
Copyright © Kluwer 1998 

References

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