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Interstellar Nal Absorption Towards the Stellar Association Ara OB1

Published online by Cambridge University Press:  25 April 2016

J. B. Whiteoak  and
F. F. Gardner
J. B. Whiteoak
Affiliation:
Division of Radiophysics, CSIRO, Sydney
F. F. Gardner
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Abstract

Observations have been made of the interstellar D-line absorption of Nal towards a loose grouping of OB stars (containing the association Ara OB1 and probably the Hα emission regions RCW 107 and 108) centred at 1 = 337°.5 and b= -0°.5. The individual absorption spectra contain several velocity components which show well-defined groupings at –37, –18 and 0 km s-1. The corresponding median optical depths are 2, 7 and 6. The evidence indicates that both the –37 and –18 km s-1 Nal clouds are located in the Carina-Sagittarius spiral arm. Several HII regions are located at similar longitudes, but most are close to zero latitude and are more distant than the arm.

The association contains the galactic cluster NGC 6193. The results suggest that the turbulence seen optically towards this cluster has been caused by the interaction between two cloud groups moving towards each other at velocities of 10 to 15 km s-1.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 6 , Issue 2 , 1985 , pp. 164 - 171
Copyright
Copyright © Astronomical Society of Australia 1985

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