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Ultraviolet observations of cool stars. VII - Local interstellar hydrogen and deuterium Lyman-alphaHigh-resolution Copernicus spectra of Epsilon Eri and Epsilon Ind containing interstellar hydrogen and deuterium L-alpha absorption lines are presented, reduced, and analyzed. Parameters of the interstellar hydrogen and deuterium toward these two stars are derived independently, without any assumptions concerning the D/H ratio. Copernicus spectra of Alpha Aur and Alpha Cen A are reanalyzed, and limits on the D/H number-density ratio consistent with the data for all four stars are considered. A comparison of the present estimates for the parameters of the local interstellar medium with those obtained by other techniques shows that there is no compelling evidence for significant variations in the hydrogen density and D/H ratio in the local interstellar medium. On this basis the hypothesis of an approaching local interstellar cloud proposed by Vidal-Madjar et al. (1978) is rejected
Document ID
19790026700
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mcclintock, W.
(Johns Hopkins University Baltimore, Md., United States)
Henry, R. C.
(Johns Hopkins Univ. Baltimore, MD, United States)
Linsky, J. L.
(Johns Hopkins Univ. Baltimore, MD, United States)
Moos, H. W.
(Johns Hopkins Univ. Baltimore, MD, United States)
Date Acquired
September 3, 2013
Publication Date
October 15, 1978
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Report/Patent Number
PB-289017
Accession Number
79A10713
Funding Number(s)
CONTRACT_GRANT: NGR-06-003-057
CONTRACT_GRANT: NSG-5078
CONTRACT_GRANT: NAS5-23274
Distribution Limits
Public
Copyright
Other

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