Galactic evolution

Details Galactic evolution Galactic evolution

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979newsc..82..902p&link_type=abstract

New Scientist, vol. 82, June 14, 1979, p. 902-904.

Astronomy and Astrophysics

Astrophysics

Astronomical Spectroscopy, Astrophysics, Galactic Evolution, Galactic Structure, Abundance, Hydrogen Clouds, Nuclear Fusion, Spiral Galaxies, Stellar Spectra

Scientific paper

A review of the galactic evolution theories is presented. Major results of studies analyzing stellar emission and absorption spectra and of surveys of element abundance distributions are summarized. It is shown that these results are consistent with two hypotheses, one suggesting that the relative birthrates of supernovae and nitrogen-making stars is constant in any one galaxy but varies systematically from one galaxy to the other, the other suggesting that the birthrates of these objects is aged-dependent; the bulk of star formation in nitrogen-deficient systems such as the Magellanic Clouds may be relatively recent, whereas it may have occurred long before in the Galaxy.

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