View source for RCW 34

{{Short description|Nebula in the constellation Vela}}
{{Infobox nebula
|name =
|image = The star forming cloud RCW 34.jpg
|caption = RCW 34 (Gum 19) nebula in the constellation of Vela
|credit =
|type = emission
|epoch = [[J2000]]
|ra = {{RA|08|56|28.1}}<ref name=SIMBAD>{{cite simbad|title=RCW 34|access-date=2020-06-13}}</ref>
|dec = {{DEC|-43|05|58}}<ref name=SIMBAD/>
|dist_ly = {{nowrap|8200 ± 700}}
|dist_pc = {{nowrap|2500 ± 200}}<ref name=Bik>{{cite journal|doi=10.1088/0004-637X/713/2/883|title=Sequential Star Formation in RCW 34: A Spectroscopic Census of the Stellar Content of High-Mass Star-Forming Regions|year=2010|last1=Bik|first1=A.|last2=Puga|first2=E.|last3=Waters|first3=L.B.F.M.|last4=Horrobin|first4=M.|last5=Henning|first5=Th.|last6=Vasyunina|first6=T.|last7=Beuther|first7=H.|last8=Linz|first8=H.|last9=Kaper|first9=L.|last10=Van Den Ancker|first10=M.|last11=Lenorzer|first11=A.|last12=Churchwell|first12=E.|last13=Kurtz|first13=S.|last14=Kouwenhoven|first14=M. B. N.|last15=Stolte|first15=A.|last16=De Koter|first16=A.|last17=Thi|first17=W. F.|last18=Comerón|first18=F.|last19=Waelkens|first19=Ch.|s2cid=12429068|journal=The Astrophysical Journal|volume=713|issue=2|pages=883–899|arxiv=1002.2571|bibcode=2010ApJ...713..883B}}</ref>
|appmag_v = 11.21<ref name=SIMBAD/>
|appdia =
|size_v =
|constellation = [[Vela (constellation)]]
|radius_ly =
|radius_pc =
|dimensions =
|absmag_v =
|notes =
|names = Gum 19, IRAS 08546-4254, VdBH 25<ref name=SIMBAD/>
}}
[[File:Around the star-formation region Gum 19 (RCW 34).jpg|right|thumb|Around the star-formation region RCW 43 (Gum 19)|241x241px]]
'''RCW 34''' ('''Gum 19''') - [[H II region]] and the [[emission nebula]] located in the [[Vela (constellation)|constellation Vela]]. It is located approximately 22,000 [[light-year|light years]] from [[Earth]]. Named after  Australian astronomer [[Colin Stanley Gum]].<ref>{{Cite web|url=https://apod.nasa.gov/apod/ap060519.html|title=APOD: 2006 May 19 - The Gum Nebula|website=apod.nasa.gov|access-date=2018-11-17}}</ref>
The nebula RCW 34 is relatively dark. However, when observed using [[infrared]] wavelengths, two different areas are visible - one half of the nebula is bright, and the other is dark. The bright side is the hydrogen illuminated by a nearby [[blue supergiant star]], and dark is the place where new stars surround the central star on the other side.
The source of energy that stimulates the nebula RCW 34 to shine is a huge, extremely hot star [[V391 Velorum]] with a surface temperature of up to 30,000&nbsp;°C. Because it is a [[variable star]], it evokes violent phenomena, including discards of matter shells, affecting the composition and light emission of the RCW 34 nebula. Stars of the type V391 Velorum do not burn long enough to explode as [[supernova]]e. It can be expected that the explosion of the central star will completely change the RCW 34 nebula.
== References ==
<references />
{{Gum catalogue}}
{{RCW}}{{Vela (constellation)}}
{{DEFAULTSORT:RCW 34}}
[[Category:Vela (constellation)]]
[[Category:Emission nebulae]]
[[Category:H II regions]]