Further spectroscopic observations of SN 1987a

Anupama, G. C. ; Prabhu, T. P. ; Ghosh, K. K. ; Ashoka, B. N. ; Giridhar, S. ; Kameswara Rao, N. (1988) Further spectroscopic observations of SN 1987a Vistas in Astronomy, 31 . pp. 261-265. ISSN 0083-6656

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0083-6656(88)90208-5


Spectroscopic observations of SN 1987a obtained during 1987 August 30 – September 8 from Vainu Bappu Observatory, Kavalur, are presented; the spectrum is compared and contrasted with the spectra recorded at earlier epochs. The lines of Fe II are weakening, whereas the forbidden lines are strengthening. The presence of [Ca II] and the emergence of [0 I] suggests that the electron density in the envelope was about 109/cm3 at the end of May, and reduced to a value below 108/cm3 by the end of August.

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