Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204l.103m&link_type=abstract
Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 2, p. L103-L106. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
21
Cool Stars, Dwarf Stars, Interstellar Gas, Late Stars, Stellar Spectra, Ultraviolet Spectroscopy, Doppler Effect, Gas Density, Hydrogen Atoms, K Stars, Line Spectra, Lyman Alpha Radiation, Oao 3, Signal To Noise Ratios, Spectrum Analysis
Scientific paper
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.
Henry Richard C.
Linsky Jeffrey L.
McClintock William
Moos Warren H.
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