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The Interstellar Gas in the Line of Sight to ϵ Canis Majoris

Published online by Cambridge University Press:  12 April 2016

C. Gry ,
L. Lemonon ,
A. Vidal-Madjar ,
M. Lemoine  and
R. Ferlet
C. Gry
Affiliation:
Laboratoire d’astronomie Spatiale, CNRS, B.P.8, F-13376 Marseille cedex 12, France
L. Lemonon
Affiliation:
Laboratoire d’astronomie Spatiale, CNRS, B.P.8, F-13376 Marseille cedex 12, France
A. Vidal-Madjar
Affiliation:
Institut d’Astrophysique, CNRS, 98 bis Boulevard Arago, F-75014 Paris, France
M. Lemoine
Affiliation:
Institut d’Astrophysique, CNRS, 98 bis Boulevard Arago, F-75014 Paris, France
R. Ferlet
Affiliation:
Institut d’Astrophysique, CNRS, 98 bis Boulevard Arago, F-75014 Paris, France

Abstract

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We analyse Hubble Space Telescope GHRS observations of the interstellar medium in the direction to ϵ CMa, the strongest EUV source in the sky located 200 pc away in a region deficient in neutral gas. We show that the neutral gas density is the lowest yet measured in a galactic sight-line. The line of sight contains three main components among which the Local Cloud, and we derive their column densities, their velocity their temperature and their turbulence velocity. We discuss the ionization of the Local Cloud and we show that we detect the conductive interface between diffuse local cloud and the hot local bubble.

Type
V. The Interstellar Medium and Diffuse Background
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 299
Copyright
Copyright © Kluwer 1996