Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (711) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (111)
· Also-Read Articles (Reads History)
· Translate This Page
A survey of interstellar molecular hydrogen. I
Savage, B. D.; Bohlin, R. C.; Drake, J. F.; Budich, W.
AA(Lockheed Research Laboratories, Palo Alto, Calif.), AB(Lockheed Research Laboratories, Palo Alto, Calif.), AC(Computer Sciences Corp., Silver Spring, Md.)
Astrophysical Journal, Part 1, vol. 216, Aug. 15, 1977, p. 291-307. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Hydrogen Clouds, Interstellar Matter, Molecular Spectra, Ultraviolet Spectra, Abundance, Oao 3, Spaceborne Astronomy
Bibliographic Code:


Data from the Copernicus satellite's ultraviolet telescope were used to survey column densities of atomic and molecular hydrogen from a large sample of early-type stars; these data have bearing on an eventual understanding of diffuse and dense interstellar clouds. Column densities are derived by fitting damping profiles to the observed spectra, most of which exhibit strong damping lines in the lower rotational levels surveyed. Plots of dust column density, fractional abundance of molecular hydrogen, and the logarithm of fractional abundance versus total gas column density are given for many of the stars; stars with abnormally large or small hydrogen column densities, as well as some distant stars at high galactic latitudes, are considered. Equilibrium and nonequilibrium theories accounting for the abundance of interstellar hydrogen are compared, and support is found in the data for an account which balances hydrogen formation on interstellar grains with destruction through photodissociation. Overall averages for atomic and molecular hydrogen levels in the galactic plane are also calculated.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences

More Article Retrieval Options

HELP for Article Retrieval

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
arXiv e-prints