Other
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..888h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 888-901.
Other
18
Abundance, Carbon, Chemical Evolution, Interstellar Chemistry, Milky Way Galaxy, Early Stars, Interstellar Extinction, Photographic Plates, Signal To Noise Ratios, Spectral Line Width, Stellar Spectra
Scientific paper
High SNR observations of interstellar CH+ have been performed of the reddened, early-type stars HD 24432m, HD 183143, and HD 157038 in an effort to probe the existence of a C-12/C-13 abundance gradient in the Galaxy. The isotope ratios appear to be a true reflection of the isotope ratios in the gas. The measurement results are in good agreement with the local ISM value of 43 + or - 4. Thus, the ISM appears hommogeneous within 1.7 kpc of the sun. The interstellar material in the observed region of the Galaxy has suffered a significant amount of chemical evolution in the past 4.5 billion years. This finding is in disagreement with most of the results derived from radio observations of other molecular species.
Hawkins Isabel
Meyer David M.
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