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Ultraviolet observations of cool stars. V - The local density of interstellar matter (1976)

Moos, H. W. ; Henry, R. C. ; Mcclintock, W. ; [et al.]

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Publication Date: 2011-08-16

Description: A high-resolution Copernicus observation of the chromospheric Ly-alpha emission line of the nearby (3.3 pc) K dwarf epsilon Eri sets limits on the velocity, the velocity dispersion, and the density of atomic hydrogen in the local interstellar medium. Analysis shows that the interstellar Ly-alpha absorption is on the flat portion of the curve of growth. An upper limit of 0.12 per cu cm is derived for the atomic-hydrogen density. The value of this density is 0.08 (plus or minus 0.04 per cu cm if the velocity-dispersion parameter is 9 km/s, corresponding to a temperature of 5000 K. Also, the interstellar deuterium Ly-alpha line may be present in the spectrum.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal; 204; Mar. 1

Format: text

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