View source for Astronomy:HD 268835

{{Short description|Star in the constellation Mensa}}
{{Starbox begin
| name=HD 268835}}
{{Starbox observe
| epoch=J2000
| ra={{RA|04|56|47.0791}}
| dec={{DEC|-69|50|24.792}}
| appmag_v=10.6<ref name="stahl">{{cite journal
 | last1       = Stahl | first1 = O.
 | last2      = Wolf | first2 = B. 
 | last3      = Zickgraf | first3 = F.-J.
 | last4      = Leitherer | first4 = C.
 | last5      = Bastian | first5 = U.
 | last6      = de Groot | first6 = M. J. H.
 | date       = April 1983
 | title      = R 66(Aeq) - an LMC B supergiant with a massive cool and dusty wind
 | journal    = Astronomy and Astrophysics
 | volume     = 120
 | issue      = 2
 | pages      = 287–296
 | bibcode    = 1983A&A...120..287S
 }}</ref>
| constell=[[Astronomy:Mensa (constellation)|Mensa]] }}
{{Starbox character
| class=B8Iae<ref name="kastner">{{Cite journal | last1 = Kastner | first1 = J. H. | last2 = Thorndike | first2 = S. L. | last3 = Romanczyk | first3 = P. A. | last4 = Buchanan | first4 = C. L. | last5 = Hrivnak | first5 = B. J. | last6 = Sahai | first6 = R. | last7 = Egan | first7 = M. | year = 2008 | title = The Large Magellanic Cloud's Top 250: Classification of the Most Luminous Compact 8 μm Sources in the Large Magellanic Cloud| journal = The Astronomical Journal | volume = 136 | issue = 3 | pages = 1221–1241 | arxiv = astro-ph/0703584| bibcode = 2008AJ....136.1221K| doi = 10.1088/0004-6256/136/3/1221 | s2cid = 117820349 }}</ref>
| b-v=0.14<ref name="stahl"/>
| u-b=-0.66<ref name="stahl"/>
| variable=LBV?<ref name="stahl"/>}}
{{Starbox astrometry
| radial_v=278
| prop_mo_ra=1.63 
| prop_mo_dec=-2.38 
| parallax=
| p_error=
| dist_kly=157
| dist_kpc=48
| absmag_v=-8.5<ref name="stahl"/> }}
{{Starbox detail
| mass=<30<ref name="kastneretal"/>
| radius=131<ref name="kastneretal"/>
| luminosity=320,000<ref name="kastneretal">{{Cite journal | last1 = Kastner | first1 = J. H. | last2 = Buchanan | first2 = C. L. | last3 = Sargent | first3 = B. | last4 = Forrest | first4 = W. J. | title = SpitzerSpectroscopy of Dusty Disks around B[e] Hypergiants in the Large Magellanic Cloud | doi = 10.1086/500804 | journal = The Astrophysical Journal | volume = 638 | issue = 1 | pages = L29–L32 | year = 2006 |bibcode = 2006ApJ...638L..29K | doi-access = free }}</ref>
| temperature=12,000<ref name="kastneretal"/>
| metal=
| rotation=
| age= }}
{{Starbox catalog
| names=HD 268835, HIP 22989, [[Astronomy:Durchmusterung|CD]]-70°273
}}
{{Starbox reference
| Simbad=HD+268835
}}
{{Starbox end}}

'''HD 268835''' (or '''R66''') (30 SM) is one of two stars that were identified by NASA's [[Astronomy:Spitzer Space Telescope|Spitzer Space Telescope]] in the Milky Way's nearest neighbor galaxy, the [[Astronomy:Large Magellanic Cloud|Large Magellanic Cloud]] (the other being R 126 or [[Astronomy:HD 37974|HD 37974]]), as being circled by monstrous dust disks that are theorised to be the origin of planets.

==Significance==
Both HD 268835 and HD 37974 are classified as [[Astronomy:Hypergiant|hypergiant]]s, very large and very bright. The dust cloud around them surprised [[Astronomy:Astronomer|astronomer]]s because stars as big as these were thought to be inhospitable to planet formation as they have very strong winds making it difficult/impossible for the dust clouds to "condense" into [[Astronomy:Planet|planet]]s.
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Astronomers estimate that the stars' disks are also bloated, spreading all the way out to an orbit about 60 times more distant than Pluto's around the Sun. The disks are probably loaded with about ten times as much mass as is contained in the Kuiper Belt. Kastner and his colleagues say these dusty structures might represent the first or last steps of the planet-forming process. If the latter, then the disks can be thought of as enlarged versions of our Kuiper Belt.
-->
''"We do not know if planets like those in our solar system are able to form in the highly energetic, dynamic environment of these massive stars, but if they could, their existence would be a short and exciting one"'' said Charles Beichman, an astronomer at NASA's [[Organization:Jet Propulsion Laboratory|Jet Propulsion Laboratory]] and the [[Organization:California Institute of Technology|California Institute of Technology]], both in Pasadena, California.<ref>[http://www.nasa.gov/vision/universe/starsgalaxies/spitzer-20060208.html NASA's Spitzer Uncovers Hints of Mega Solar Systems], Nasa.gov, accessed 11 Feb 2006</ref>

[[File:Solar System and Star R66.jpg|thumb|none|Artist's impression depicting HD 268835's dust disk compared to the [[Astronomy:Solar System|Solar System]]]]
[[Image:R 66 and R 126 graph.png|thumb|none|Graph data of the stars]]

==References==
{{reflist}}
* {{cite simbad|title=HD 268835}}

{{Stars of Mensa}}

[[Category:Stars in the Large Magellanic Cloud]]
[[Category:Mensa (constellation)]]
[[Category:Luminous blue variables]]
[[Category:B-type hypergiants]]
[[Category:Henry Draper Catalogue objects|268835]]
[[Category:Hipparcos objects|022989]]
[[Category:Durchmusterung objects|CD-70 00273]]
[[Category:B(e) stars]]

ko:R 66과 R 126
it:R 66 e R 126

{{Sourceattribution|HD 268835}}