| 词条 | SN 1990U |
| 释义 |
| name = SN 1990U | image = | caption = | epoch = J2000.0 | type = SN Ic | SNRtype = | host = NGC 7479 | constellation = Pegasus | ra = {{RA|23|04|54.96}}[2] | dec = {{DEC|+12|18|20.1}}[2] | gal = 086.2501 -42.8526 | discovery = July 27, 1990 | iauc = | redshift = 0.00794[5] | mag_v = {{val|16|0.5}} | distance = 105,000,000 l.y. | notes = }}SN 1990U was a type Ic supernova event in the nucleus of the galaxy NGC 7479. It was discovered July 27, 1990 by the Berkeley Automated Supernova Search after reaching magnitude {{val|16|0.5}}. Initially this was classified as a Type Ib supernova, but the weakness of the neutral helium absorption lines led to a reclassification.[8] References1. ^1 {{citation | last1=Matheson | first1=Thomas | last2=Filippenko | first2=Alexei V. | last3=Li | first3=Weidong | last4=Leonard | first4=Douglas C. | last5=Shields | first5=Joseph C. | title=Optical Spectroscopy of Type IB/C Supernovae | journal=The Astronomical Journal | volume=121 | issue=3 | pages=1648–1675 | date=March 2001 | doi=10.1086/319390 | bibcode=2001AJ....121.1648M|arxiv = astro-ph/0101119 }} [1][2][3]2. ^1 2 {{citation | last=Tsvetkov | first=D. Yu. | last2=Pavlyuk | first2=N. N. | last3=Bartunov | first3=O. S. | last4=Pskovskii | first4=Yu. P. | title=Sternberg Astronomical Institute Supernova Catalogue | url=http://www.sai.msu.su/sn/sncat/ | publisher=Sternberg Astronomical Institute, Moscow University | accessdate=2015-08-26}} 3. ^1 {{citation | last1=Modjaz | first1=M. | last2=Kewley | first2=L. | last3=Bloom | first3=J. S. | last4=Filippenko | first4=A. V. | last5=Perley | first5=D. | last6=Silverman | first6=J. M. | title=Progenitor Diagnostics for Stripped Core-collapse Supernovae: Measured Metallicities at Explosion Sites | journal=The Astrophysical Journal Letters | volume=731 | issue=1 | id=L4 | pages=6 | date=April 2011 | doi=10.1088/2041-8205/731/1/L4 | bibcode=2011ApJ...731L...4M |arxiv = 1007.0661 }} }} External links
2 : Pegasus (constellation)|Supernovae |
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