Evolution of the optical spectrum of SN 1987a in the large magellanic cloud

Ashoka, B. N. ; Anupama, G. C. ; Prabhu, T. P. ; Giridhar, S. ; Ghosh, K. K. ; Jain, S. K. ; Pati, A. K. ; Rao, N. Kameswara (1987) Evolution of the optical spectrum of SN 1987a in the large magellanic cloud Journal of Astrophysics and Astronomy, 8 (2). pp. 195-209. ISSN 0250-6335

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Official URL: http://www-old.ias.ac.in/jarch/jaa/8/195-209.pdf

Related URL: http://dx.doi.org/10.1007/BF02714317


The evolution of the spectrum of SN1987a is traced from 1987 February 26 to March 31. Based on the low-resolution spectroscopic data we identify the lines of H, He I, Na I, Fe II, Sc II, Ca II which are known to be present in Type II Supernovae, and also present evidence for the existence of lines of Mg I, CaI, O I, and N I. We discuss the evolution of the Hα profile, and draw attention to its complex structure around March 30. Close to the rest wavelength of Ha a double-peaked structure appeared in the profile with a peak-to-peak separation of ~ 1400 km s−1, suggestive of an expanding shell or disc of gas. Using the available broadband photometric information, we also trace the evolution of the photosphere of SN1987a assuming that it radiates like a supergiant.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Supernovae; Supernovae; SN1987a
ID Code:100768
Deposited On:10 Dec 2016 12:36
Last Modified:10 Dec 2016 12:37

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