SIMBAD references

2001A&A...367..617G - Astronomy and Astrophysics, volume 367, 617-628 (2001/2-4)

Local clouds: Ionization, temperatures, electron densities and interfaces, from GHRS and IMAPS spectra of ε Canis Majoris.


Abstract (from CDS):

The composition and physical properties of several local clouds, including the Local Interstellar Cloud (LIC) in which the Sun is embedded, are derived from absorption features in the UV spectrum of the star ε CMa. We derive temperatures and densities for three components by combining our interpretations of the ionization balance of magnesium and the relative population of Cii in an excited fine-structure level. We find that for the LIC ne=0.12±0.05cm–3 and T=7000±1200K. We derive the ionization fractions of hydrogen and discuss the ionizing processes. In particular the hydrogen and helium ionizations in the LIC are compatible with photoionization by the local EUV radiation fields from the hot stars and the cloud interface with the hot gas. We confirm the detection of high ionization species: Siiii is detected in all clouds and Civ in two of them, including the LIC, suggesting the presence of ionized interfaces around the local clouds.

Abstract Copyright:

Journal keyword(s): ISM: solar neighbourhood - ISM: clouds - ISM: ionization - ISM: structure - stars: individual: ε CMa - ultraviolet: ISM

Simbad objects: 12

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