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7/18/2019 Wolf Rayet Stars
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Wolf-Rayet Stars
• Evolved, massive eruptive variable stars that lose mass
rapidly (usually 10−5 solar masses a year) by means of a
strong stellar wind with speeds up to 2000 m!s
• E"tremely hot (surfa#e temperatures range from $0,000-
200,000 %) and highly luminous, with spe#tros#opi# output
mostly in ultraviolet and soft &-ray range
• 'irst dis#overed by harles Wolf and eorges Rayet in
*+ at .aris /bservatory
• ormal stage in evolution of very massive stars, with
strong, broad emission lines of helium 1 nitrogen or helium
1 #arbon 1 o"ygen
• ery rare, about 300 #atalogued in 4ily Way
2$35
WR *26