A model for nitrogen isotopic variations in the lunar regolith - Possible solar system contributions from a nearby planetary nebula
Abstract
To account for the observed secular increase of the N-15/N-14 ratio in lunar samples, a model is developed which envisions an encounter between a planetary nebula and the solar system during the first few hundred million years of its history. The principal effects of the encounter for the sun's outer convective zone, and hence solar wind, due to accretion of planetary nebula material with its distinct nucleosynthetic history are delineated. Associated material contributions to planets and meteorite parent bodies are considered and contraints relevant to this possibility are discussed.
- Publication:
-
The Ancient Sun: Fossil Record in the Earth, Moon and Meteorites
- Pub Date:
- 1980
- Bibcode:
- 1980asfr.symp..491R
- Keywords:
-
- Lunar Soil;
- Nitrogen Isotopes;
- Planetary Nebulae;
- Regolith;
- Stellar Evolution;
- Astronomical Models;
- Cosmic Dust;
- Nitrogen 15;
- Nuclear Fusion;
- Solar System;
- Lunar and Planetary Exploration