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Far-infrared spectrophotometry of SN 1987A - Days 265 and 267The paper presents 16-66-micron spectra of SN 1987A taken on days 266 and 268 after core collapse. The spectrum consists of a nearly flat continuum, strong emission lines of hydrogen, and fine-structure lines of Fe II, Fe III, Co II, S I, and possibly Fe I, Ni II, and S III. From the relative strength of three lines which arise from transitions within the ground and excited states of Fe II, the temperature and a lower limit on the density of the line-emitting region are derived. From the line strengths, the abundances of Fe and S I, the end products of explosive nucleosynthesis in the supernova are estimated. An upper limit is also set to the amount of Co II remaining in the mantle. The low measured mass of Fe suggests that the ejecta are clumpy. The flat continuum is most likely free-free emission from the expanding supernova ejecta. About 35 percent of this emission arises from the ionized metals in the mantle; the rest arises from ionized hydrogen. At the time of these observations, there is no evidence for any emission from dust that may have formed in the supernova ejecta or from preexisting dust in the surrounding medium.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Moseley, S. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dwek, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Silverberg, R. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Glaccum, W. (Applied Research Corp. Landover, MD, United States)
Graham, J. R. (California Institute of Technology Pasadena, United States)
Loewenstein, R. F. (Yerkes Observatory Williams Bay, WI, United States)
Date Acquired
August 14, 2013
Publication Date
December 15, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 347
ISSN: 0004-637X
Subject Category
Distribution Limits