The evolution of the C, N, and O isotope ratios from an improved comparison of the interstellar medium with the Sun

Details The evolution of the C, N, and O isotope ratios from an improved comparison of the interstellar medium with the Sun The evolution of the C, N, and O isotope ratios from an improved comparison of the interstellar medium with the Sun

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..139w&link_type=abstract

Astronomy and Astrophysics 326, 139-142

Astronomy and Astrophysics

Astrophysics

27

Scientific paper

We present an improved comparison of the C, N, and O isotope ratios between the Sun and the interstellar medium, in which the birth-place of the Sun is taken into account. Such a comparison gives empirical information about the time evolution of the isotope ratios in the interstellar medium over the last 4.5x10^9^ years. Wielen et al. (1996A&A...314..438W) have found that the Sun was born at a galactocentric distance R_i,&sun;_ which is 1.9kpc (+/-0.9kpc) smaller than the present galactocentric distance R_0_ of the Sun. Therefore, we use the values of the present-day isotope ratios of the interstellar medium at this galactocentric distance R_i,&sun;_, instead of the conventional approach using local values at R_0_ for the comparison with the solar system. For three isotope ratios, the improved comparison produces results which are in better agreement with theoretical predictions than the results of a conventional comparison. The most important improvement is found for ^16^O/^18^O: This isotope ratio is found to decrease with time if the birth-place of the Sun is taken into account. The better agreement of the evolution in time of isotope ratios derived from our improved comparison with the theoretical expectations provides supporting evidence that the birth-place of the Sun is closer to the galactic center than R_0_, as found by Wielen et al.

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