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 (125) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· Also-Read Articles (Reads History)
· Translate This Page
The isotopic abundances of interstellar oxygen
Penzias, A. A.
AA(Bell Telephone Laboratories, Inc., Holmdel, NJ)
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 518-523. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Abundance, Interstellar Matter, Molecular Clouds, Nuclear Fusion, Oxygen Isotopes, Carbon Monoxide, Galactic Nuclei, Line Spectra, Spectrum Analysis, Stellar Mass Ejection
Bibliographic Code:


The uniformity of the relative abundance of O-17 and O-18 in the Galaxy's giant molecular clouds, where it varies by less than about 5% between the galactic center and sources as much as 12 kPc away, is thought to reflect the similarity in the galactic processes which introduce the two isotopes into the interstellar medium. The processes are (1) novae explosions, in the case of O-17 and (2) mass loss from low-to-intermediate mass stars, in the case of O-18. Of the two known small-scale deviations from the general uniformity, the O-18/O-17 ratio in the IRC+10216 evolving star envelope, which is found to be an order of magnitude below the galactic value, is nevertheless consistent with present understanding of nucleosynthesis, while the 40% O-18/O-17 enhancement in the solar system remains an enigma.

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