Mathematics – Logic
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..419a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, June 1984, p. 419-421. Research supported by the Co
Mathematics
Logic
Abundance, Interstellar Extinction, Interstellar Gas, Supernova Remnants, Astronomical Models, Calcium, Gas Temperature, Ionized Gases, Sodium, Time Dependence
Scientific paper
Results are presented for determinations of R (the ratio of neutral sodium to singly ionized calcium), which are based on a time-dependent model for absorbing clouds in the line of sight of various stars. Cosmic abundances of sodium and calcium are assumed; the time-dependent model used is based on a model of the interstellar medium described by Jura and Dalgarno (1972). The model can provide clouds of high velocity and high temperature for R less than 1 some 100,000 to 1,000,000 years after a supernova explosion and R greater than 1 as the temperature goes down with recombination of the gas. The observed values can be fitted with the time-dependent models. The time-dependent model must yet be tested with the ratio of singly ionized silicon to singly ionized calcium, for which good observations are available.
Aldrovandi M. V. S.
Brunetto S. Q.
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