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Record Details

Record 90 of 16914
Spectral line profiles of nickel and argon in supernova 1987A - Expansion velocity and electron scattering effects
External Online Source: doi:10.1086/185388
Author and Affiliation:
Witteborn, F. C.(NASA Ames Research Center, Moffett Field, CA, United States)
Bregman, J. D.(NASA Ames Research Center, Moffett Field, CA, United States)
Wooden, D. H.(NASA Ames Research Center, Moffett Field, CA, United States)
Pinto, P. A.(NASA Ames Research Center, Moffett Field, CA, United States)
Rank, D. M.(Lick Observatory, Santa Cruz, CA, United States)
et al.
Abstract: Spectra of SN 1987A showing the Ni II 6.634-micron and Ar II 6.983-micron fine-structure lines were obtained from the Kuiper Airborne Observatory in April 1988. The signal-to-noise ratio of 100 near the peaks and resolving power of 200 are sufficient to show the average velocity of expansion from the core of about 1400 km/s and to indicate the range of velocities. An asymmetry in the profiles of both lines and a redshift of the line centroids of about 440 km/s above the 280-km/s recessional velocity of the LMC can be explained in terms of scattering of the photons by electrons in the expanding hydrogen envelope of the supernova. A mass of 0.0030 solar masses of Ni II can be deduced from the line strength of the Ni II line and a mass of 0.0009 solar masses of Ar II from the Ar II line strength.
Publication Date: Mar 01, 1989
Document ID:
19890039676
(Acquired Nov 28, 1995)
Accession Number: 89A27047
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 338; L9-L12
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Lick Observatory; Santa Cruz, CA, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ARGON; ELECTRON SCATTERING; LINE SHAPE; NICKEL; STELLAR SPECTRA; SUPERNOVA 1987A; PARTICLE MOTION; STELLAR MODELS; VELOCITY MEASUREMENT
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 1, 1989, p. L9-L12.
Availability Source: Other Sources
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