Ultraviolet observations of cool stars. VIII - Interstellar matter toward Procyon

Details Ultraviolet observations of cool stars. VIII - Interstellar matter toward Procyon Ultraviolet observations of cool stars. VIII - Interstellar matter toward Procyon

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..883a&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Dec. 15, 1978, p. 883-887.

Astronomy and Astrophysics

Astrophysics

25

Cool Stars, Hydrogen Clouds, Interstellar Matter, Stellar Temperature, Ultraviolet Spectra, Deuterium, Oao 3, Stellar Spectrophotometry

Scientific paper

The profile of the chromospheric L-alpha emission line of the F5 IV-V star Procyon (Alpha CMi, d = 3.5 pc) has been measured using the high-resolution Princeton spectrometer aboard NASA's Copernicus satellite. L-alpha absorption lines of interstellar deuterium and hydrogen are distinctly present. The average number density of interstellar hydrogen along the line of sight is found to be 0.11 + or - 0.02 per cu cm, similar to the densities that have been found in the directions of the stars Epsilon Eri, Epsilon Ind, and Alpha Cen A. These stars are all within 3.5 pc of the earth. The ratio of deuterium to hydrogen in the direction of Procyon is found to be 1.3 (+1.2, -0.5) x 10 to the -5th.

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