Charge transfer in helium-rich supernova plasma

Details Charge transfer in helium-rich supernova plasma Charge transfer in helium-rich supernova plasma

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..267s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 267-274

Astronomy and Astrophysics

Astrophysics

12

Abundance, Charge Transfer, Helium, Helium Plasma, Metallicity, Plasma Conductivity, Supernovae, Approximation, Astronomical Models, Light Emission, Line Spectra

Scientific paper

Charge transfer rate coefficients are estimated using Landau-Zener and modified Demkov approximations. The coefficients, augmented by those available from the literature, are used in statistical equilibrium equations describing the state of helium-rich supernova plasma. Such a plasma may describe both Type Ib and Type Ic supernova ejecta. The hypothesis that extensive mixing of metals with helium in Type Ic supernovae may provide a catalyst for rapid charge transfer that weakens the helium line emission by altering the excitation balance is tested. It is shown that charge transfer as a mechanism for suppressing helium line emission is ineffective unless the metal abundance is comparable to or larger than the helium abundance. This result supports an earlier conclusion that Type Ic supernovae must be helium poor relative to Type Ib events.

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