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Vertical Metallicity Gradient of the Galaxy Based on UBV Starcount Data

Published online by Cambridge University Press:  26 July 2016

T. Yamagata  and
Y. Yoshii
T. Yamagata
Affiliation:
Elementary and Secondary Education Bureau, Ministry of Education, Science and Culture, Kasumigaseki, Chiyoda, Tokyo 100, Japan
Y. Yoshii
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181, Japan

Abstract

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The spatial distribution of metal abundance in the Galaxy has been analyzed using the UBV starcount data recently obtained in two high-latitude regions of the North Galactic Pole (NGP) and Selected Area 54 (SA54).

A least-squares analysis was performed to determine the vertical metallicity gradient for each of the thin and thick disk components that gives a reasonable fit to the observed U-B and B-V colour distributions to V = 18 mag. The most probable value of the vertical gradient is obtained as d[Fe/H]/dz = −0.5 kpc−1 for the thin disk, and −0.1 kpc−1 for the thick disk.

Type
Part Nine: Galactic Structure
Information
Symposium - International Astronomical Union , Volume 161: Astronomy from Wide-Field Imaging , 1994 , pp. 420 - 422
Copyright
Copyright © Kluwer 1994 

References

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