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- W2088722570 abstract "view Abstract Citations (125) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Early Spectral Phase of Type Ib Supernovae: Evidence for Helium Harkness, R. P. ; Wheeler, J. C. ; Margon, B. ; Downes, R. A. ; Kirshner, R. P. ; Uomoto, A. ; Barker, E. S. ; Cochran, A. L. ; Dinerstein, H. L. ; Garnett, D. R. ; Levreault, R. M. Abstract A near-infrared spectrum and several optical spectra of SN 1983N obtained over a period from 10 days before maximum light to about a week after maximum and of SN 1984L from about maximum light to about 60 days later are presented. On the basis of these spectra it is argued that the first definite identification of helium in supernova ejecta near maximum light has been made. The emergence of oxygen emission lines which presage the dramatic transition to the supernebular phase is identified. Supernova atmosphere models which are consistent with the observations are presented, and it is argued that a strong departure of helium level populations from LTE is necessary. The current status of SNe Ib, the arguments that they result from core collapse in moderately massive stars, and some of the immediate work necessary to further clarify the nature of these events are summarized. Publication: The Astrophysical Journal Pub Date: June 1987 DOI: 10.1086/165283 Bibcode: 1987ApJ...317..355H Keywords: Abundance; Helium; Infrared Spectra; Iron; Supernovae; White Dwarf Stars; Emission Spectra; Kinetic Energy; Light Curve; Stellar Composition; Stellar Mass; Astrophysics; STARS: ABUNDANCES; STARS: SUPERNOVAE full text sources ADS | data products SIMBAD (2) NED (2)" @default.
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- W2088722570 date "1987-06-01" @default.
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- W2088722570 title "The early spectral phase of type Ib supernovae - Evidence for helium" @default.
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