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1.6. Are the Galactic bulge and bar the same?

Published online by Cambridge University Press:  25 May 2016

Yuen Keong Ng
Yuen Keong Ng*
Affiliation:
Padova Astronomical Observatory, Vicolo dell'Osservatorio 5, I-35122 Padova, ITALY

Abstract

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An overview is given of the results obtained about Galactic Structure studies towards the Galactic Centre from star counts. The results indicate the presence of an old metal-rich population (Z = 0.005–0.08; t = 13–15 Gyr), presumably the old Galactic Bulge. In addition, a younger, less metal-rich population was found (Z = 0.005-0.03; t = 8–9 Gyr), likely related to the tri-axial bar found in other studies. In Baade's Window a ratio bulge/bar stars of approximately 1/2 was obtained from star counts.

Type
Part I. Stellar Cluster, Star Formation
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 27 - 28
Copyright
Copyright © Kluwer 1998 

References

Bertelli, G., Bressan, A., Chiosi, C., Fagotto, F., Nasi, E., 1994, A&AS 106, 275.Google Scholar
Bertelli, G., Bressan, A., Chiosi, C., Ng, Y.K., Ortolani, S., 1995, A&A 301, 381.Google Scholar
Bertelli, G., Bressan, A., Chiosi, C., Ng, Y.K., 1996, A&A 310, 115.Google Scholar
Ng, Y.K., Bertelli, G., 1996, A&A 315, 116.Google Scholar
Ng, Y.K., Bertelli, G., Bressan, A., Chiosi, C., Lub, J., 1995, A&A 295, 655.Google Scholar
Ng, Y.K., Bertelli, G., Chiosi, C., Bressan, A., 1996, A&A 310, 771.Google Scholar
Ng, Y.K., Bertelli, G., Chiosi, C., Bressan, A., 1997, A&A 324, 65.Google Scholar