Supernovae - Still a challenge

Details Supernovae - Still a challenge Supernovae - Still a challenge

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983s%26t....66..485r&link_type=abstract

Sky and Telescope (ISSN 0037-6604), vol. 66, Dec. 1983, p. 485-490.

Astronomy and Astrophysics

Astrophysics

Astrophysics, Stellar Evolution, Supernovae, Binary Stars, Light Curve, Spiral Galaxies, Stellar Models, White Dwarf Stars

Scientific paper

Historical data on supernovae (SN) occurrences are surveyed, together with present models for the physical processes occurring during the events. Type I SN feature low intensity hydrogen lines, while the hydrogen lines are prominant in Type II phenomena. Only Type I events seem to occur in elliptical galaxies, implying that the Type I events involve relatively old, low-mass objects. Both types occur in spatial galaxies, although the Type II objects are usually located in gas-rich stellar nurseries of the spiral arms, suggesting the Type II SN progenitor stars are only a few million years old. The light curves of Type I SN maintain a peak brightness significantly longer than do Type II SN, whose brightness declines irregularly. The incineration of a white dwarf that could account for observations of nickel abundances in a Type I burst, which may be confined to binary systems, is outlined. Processes that occur in a core bounce in a Type II SN, when a massive star collapses and gravitational energy abruptly changes into expansive energy, are discussed.

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