编辑“︁SN 1993J”︁（章节）

==前身星==
科学家已经从SN 1993J爆发前的照片中识别出SN 1993J的前身星<ref name='aldering94'>{{cite journal | title = SN 1993J: The optical properties of its progenitor | journal = Astronomical Journal | year = 1994 | first = G. | last = Aldering | coauthors = R. Humphreys, M. Richmond | volume = 107 | pages = 662| doi = 10.1086/116886 | bibcode = 1994AJ....107..662A}}</ref>。它的前身星是一颗[[超巨星|K型超巨星]]，但却发出过量的紫外光，这可能是它附近的炽热恒星，或拥有一颗炽热的伴星而造成的。虽然SN 1993J位于M81中年轻的大质量恒星聚集的区域<ref name='vandyk2002'>{{cite journal | title = The Progenitor of Supernova 1993J Revisited | journal = PASP | year = 2002 | first = S.D. | last = Van Dyk | coauthors = P.M Garnavich, A.V. Filippenko, P.A. Hoflich, R.P. Kirshner, R.L. Kurucz, P. Challis | volume = 114 | issue = 802 | pages = 1322| doi = 10.1086/344382 | bibcode = 2002PASP..114.1322V|arxiv = astro-ph/0208382 }}</ref>，但天文学家团队借助[[哈勃太空望远镜]]上的先进巡天相机（ACS）以及[[夏威夷]][[毛纳基山]]的[[凯克望远镜]]，找到了一颗B型超巨星，它恰好位于长期推测的前身星的伴星应该在的位置上<ref name='maund04'>{{cite journal | doi = 10.1038/nature02161 | title = The massive binary companion star to the progenitor of supernova 1993J | url = https://archive.org/details/sim_nature-uk_2004-01-08_427_6970/page/128 | journal = Nature | year = 2004 | first = J. | last = Maund | pmid = 14712269 | coauthors = S.J. Smartt, R.P. Kudritzki, P. Podsiadlowski, G.F. Gilmore | volume = 427 | issue = 6970 | pages = 129–31| id = | bibcode = 2004Natur.427..129M|arxiv = astro-ph/0401090 }}</ref>。这次观测还为超新星爆发相关的天体物理学研究提供了详细的观测资料。现在已经可以确定，在SN 1993J爆发前的最后250年间，大约10个太阳质量的气体从SN 1993J的前身星迅速转移到了伴星<ref name=spacetelescope/>。