Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219...60g&link_type=abstract
Astrophysical Journal, Part 1, vol. 219, Jan. 1, 1978, p. 60-71.
Astronomy and Astrophysics
Astronomy
24
Absorption Spectra, H Lines, Line Spectra, Radio Astronomy, Ultraviolet Spectra, Astronomical Maps, Cloud Physics, Electromagnetic Absorption, Hydrogen Clouds, Microwaves
Scientific paper
Several absorption components detected in visible or UV lines have been identified with emission features in new high-resolution, high signal-to-noise 21 cm observations. Stars for which direct overlap is obtained are HD 28497, lambda Ori, mu Col, HD 50896, rho Leo, HD 93521, and HD 219881. With the use of the inferred H I column densities from 21 cm profiles, rather than the integrated column densities obtained from L-alpha, more reliable densities can be derived from the existence of molecular hydrogen. Hence the cloud thicknesses are better determined; and 21 cm emission maps near these stars can be used to obtain dimensions on the plane of the sky. It is now feasible to derive detailed geometries for isolated clumps of gas which produce visual absorption features.
Giovanelli Riccardo
Haynes Martha P.
Shull Michael J.
York Don G.
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