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OH/IR Stars Near the Galactic Centre

Published online by Cambridge University Press:  18 September 2017

H.J. Habing
Affiliation:
Sterrewacht, Huygens Laboratorium, Leiden
F.M. Olnon
Affiliation:
Sterrewacht, Huygens Laboratorium, Leiden
A. Winnberg
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn
H.E. Matthews
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn
B. Baud
Affiliation:
Radio Astronomy, University of California, Berkeley

Extract

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We have detected 34 OH/IR stars within 1 degree of the galactic centre by their OH emission line at 1612 MHz (18 cm) using the Effelsberg 100 m telescope and the Very Large Array. The spatial distribution and the distribution of the radial velocities show that practically all stars are within 150 pc from the Galactic centre, and that the number of foreground objects is very small. The projected distribution of the stars is similar to that of the surface brightness at 2.4 μm. Since the 2.4 μm radiation is supposed to be due to red giants, the OH/IR stars are probably members of the same population. The stars have considerable random velocities (velocity dispersion in one coordinate of 150 ± 50 km s−1), but show general Galactic rotation. The high velocity dispersion is remarkable for objects of this population.

Type
Abstracts of Contributed Papers
Copyright
Copyright © Reidel 1983