Abstract： We study the circumstellar interaction around SN 1993J by its intermediate-band light curves obtained by the 60/90 cm Schmidt telescope at Xinglong station. The optical emission showed a slow decay of 0.05±0.02 mag/100 d in the period from 1995 to 2003, invoking a main energy contribution from SN-circumstellar interaction at late times. The relatively flat power law SN density model fits better with the observations. In particular, the line ratio of [O III]λλ4959, 5007 and Na I D relative to Hα are well reproduced by the model. Moreover, the Hα light curve displayed obvious bump structures at some epochs, which is probably attributed to the density fluctuations in the ambient material that surrounds the reverse shockwave.
WANG Xiao-Feng;ZHANG Tian-Meng;ZHOU Xu;LI Zong-Wei. Optical Evidence for Circumstellar Interaction Around SN 1993J[J]. 中国物理快报, 2004, 21(7): 1398-1401.
WANG Xiao-Feng, ZHANG Tian-Meng, ZHOU Xu, LI Zong-Wei. Optical Evidence for Circumstellar Interaction Around SN 1993J. Chin. Phys. Lett., 2004, 21(7): 1398-1401.
2004, Vol. 21 
