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Date and Time of the Query: 2019-06-26 T15:20:03 PDT
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For refcode 1997ApJ...481L..89F:
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1997ApJ...481L..89F Evidence for a High-Velocity Carbon-rich Layer in the Type Ia SN 1990N ADAM FISHER, DAVID BRANCH, PETER NUGENT, AND E. BARON Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 Received 1996 November 25; accepted 1997 March 7 ABSTRACT We use a parameterized spectrum-synthesis code to make a direct analysis of a high quality spectrum of the Type Ia SN 1990N that was obtained by Leibundgut et al. 14 days before the time of optical maximum. We suggest that the absorption feature observed near 6040 A, which has been attributed to blueshifted {lambda}6355 of Si II, actually was produced by blueshifted {lambda}6580 of C II, in a high-velocity (v > 26, 000 km s^-1^) carbon-rich region. Implications for SN Ia explosion models are briefly discussed. Subject headings: line: formation-line: identification-line: profiles- supernovae: individual (SN 1990N)
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