Constraints on the sites of nitrogen nucleosynthesis from (N-15)H3-observations

Details Constraints on the sites of nitrogen nucleosynthesis from (N-15)H3-observations Constraints on the sites of nitrogen nucleosynthesis from (N-15)H3-observations

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..241g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 241-250.

Astronomy and Astrophysics

Astrophysics

37

Ammonia, Galactic Evolution, Interstellar Matter, Molecular Clouds, Nitrogen, Nuclear Fusion, Abundance, Chemical Evolution, Line Spectra, Orion Nebula

Scientific paper

Results on the interstellar (N-14)/(N-15) isotope ratio in molecular clouds in DR21(OH), S140, and W3(OH) and in the galactic center are presented, based upon observations of the NH3(J = K = 1.2) inversion lines. Since the time the solar system was formed 4.5 Gyrs ago, the local interstellar matter has been moderately enriched only: (N-14)/(N-15) equals about 400. In the center of the Galaxy, the isotope ratio is enhanced by a factor of 4 over the solar system value (270). Chemical fractionation, nonthermalization of the transitions, and population of higher levels in NH3 do not affect these results, except for W3(OH). The CNO abundance data are analyzed in terms of a galactic-evolution model, and it is concluded that N-15 is probably synthesized in massive progenitors (m greater than or equal to 5 solar mass) during primary processing, ruling out normal novae as cooking sites. For the other nuclei, a reasonably consistent picture of chemical evolution is obtained, if recent yields for low and intermediate mass stars, which take into account deep mixing and partly primary envelope processing during the late giant phase are used.

Affiliated with

Also associated with

No associations

Rating

Constraints on the sites of nitrogen nucleosynthesis from (N-15)H3-observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Constraints on the sites of nitrogen nucleosynthesis from (N-15)H3-observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on the sites of nitrogen nucleosynthesis from (N-15)H3-observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1288344