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The Mass Distribution in the Galactic Centre Estimated from OH/IR Stars

Published online by Cambridge University Press:  23 September 2016

M. Lindqvist ,
A. Winnberg ,
H. J. Habing ,
H. E. Matthews  and
F. M. Olnon
M. Lindqvist
Affiliation:
Onsala Space Observatory
A. Winnberg
Affiliation:
Onsala Space Observatory
H. J. Habing
Affiliation:
Sterrewacht Leiden
H. E. Matthews
Affiliation:
James Clerk Maxwell Telescope
F. M. Olnon
Affiliation:
Sterrenwacht Dwingeloo

Abstract

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The preliminary results of a search for OH/IR stars in the Galactic Centre using the VLA are presented. The goal of this project is to determine the mass density distribution from a few parsecs up to about 120 pc of the Galactic Centre using stellar kinematics. Up to now, 125 OH/IR stars have been found. The distribution of the stars is clearly elongated with the major axis parallel to the galactic equator. The stars show a rotation of 117 km s−1 deg−1 with a dispersion of 90 km s−1. Two preliminary models have been applied in order to determine the enclosed mass, resulting in M(r)=4.0·106·r1.4 Mo, where r is the galactocentric distance in parsecs.

Type
Stars and the Central Mass Distribution
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 503 - 508
Copyright
Copyright © Kluwer 1989 

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