View source for Astronomy:SMC 018136

{{Short description|Star in the Small Magellanic Cloud in the constellation Tucana}}
{{Starbox begin
 | name = SMC 018136
}}
{{Starbox image
 | image =[[File:Small Magellanic Cloud (Digitized Sky Survey 2).jpg|280px]]
 | caption = SMC 018136 is visible in the full-size image
}}
{{Starbox observe
 | epoch = [[Astronomy:J2000|J2000]]
 | constell = [[Astronomy:Tucana|Tucana]]
 | ra =  {{Deg2HMS|012.733728|sup=no}}<ref name=2mass/>
 | dec = {{Deg2DMS|-72.251686|sup=no}}<ref name=2mass/>
 | appmag_v = 11.61<ref name=tycho2/>
}}
{{Starbox character
 | class    = K4.5 Ia-Ib,<ref name=davies2018>{{cite journal |arxiv=1804.06417 |doi=10.1093/mnras/sty1302 |title=The luminosities of cool supergiants in the Magellanic Clouds, and the Humphreys–Davidson limit revisited |year=2018 |last1=Davies |first1=Ben |last2=Crowther |first2=Paul A. |last3=Beasor |first3=Emma R. |s2cid=59459492 |journal=Monthly Notices of the Royal Astronomical Society |volume=478 |issue=3 |pages=3138–3148 |bibcode=2018MNRAS.478.3138D }}</ref> M0Ia<ref name=humphreys/>
 | appmag_1_passband = K
 | appmag_1 = {{val|7.849|0.020}}<ref name=2mass/>
}}
{{Starbox astrometry
 | radial_v = 185.7<ref name=rv/>
 | dist_ly = 
 | dist_pc = 
}}
{{Starbox detail
 | mass =
 | radius = 945<ref name=m31m33></ref>
 | luminosity = 186,000<ref name=m31m33></ref>
 | temperature = 3,900<ref name=m31m33></ref>
 | gravity = −0.4<ref name=dicenzo2019>{{cite journal |bibcode=2019AJ....157..167D |title=Atomic Absorption Line Diagnostics for the Physical Properties of Red Supergiants |last1=Dicenzo |first1=Brooke |last2=Levesque |first2=Emily M. |journal=The Astronomical Journal |year=2019 |volume=157 |issue=4 |page=167 |doi=10.3847/1538-3881/ab01cb |arxiv=1902.01862 |s2cid=119076156 |doi-access=free }}</ref>
}}
{{Starbox catalog
 | names = [[Astronomy:Tycho-2 Catalogue|TYC]] 9138-1852-1, [[Astronomy:2MASS|2MASS]]&nbsp;J00505609-7215060, GSC&nbsp;09138-01852
}}
{{Starbox reference
 | Simbad = SkKM+63
}}
{{Starbox end}}
'''SMC 018136''', also known as '''PMMR 37''', is a [[Astronomy:Red supergiant star|red supergiant star]] located in the [[Astronomy:Small Magellanic Cloud|Small Magellanic Cloud]]. It is [[Astronomy:List of largest stars|one of the largest stars]] and one of the [[Astronomy:List of most luminous stars|most luminous]] SMC cool supergiants so far discovered, with a radius of 945 times that of the sun and a bolometric luminosity almost 200,000 times more than Sun. If it were in the place of the [[Astronomy:Sun|Sun]], its [[Astronomy:Photosphere|photosphere]] would at least engulf the orbit of [[Astronomy:Mars|Mars]].<ref name="m31m33">{{Cite journal |last1=Massey |first1=Philip |last2=Neugent |first2=Kathryn F. |last3=Ekström |first3=Sylvia |last4=Georgy |first4=Cyril |last5=Meynet |first5=Georges |date=2023-01-01 |title=The Time-averaged Mass-loss Rates of Red Supergiants as Revealed by Their Luminosity Functions in M31 and M33 |journal=The Astrophysical Journal |volume=942 |issue=2 |pages=69 |doi=10.3847/1538-4357/aca665 |arxiv=2211.14147 |bibcode=2023ApJ...942...69M |issn=0004-637X|doi-access=free }}</ref>

SMC 018136 has a spectral type M0 Ia<ref name=humphreys/> and an effective temperature 3,900 [[Kelvin|K]],<ref name="m31m33" /> although more recent papers suggest it has a slightly earlier spectral type of K4.5 Ia-Ib.<ref name=davies2018/>

== See also==
*[[Astronomy:List of largest stars|List of largest stars]]
*[[Astronomy:HV 11423|HV 11423]]
*[[Astronomy:VY Canis Majoris|VY Canis Majoris]]

== References ==
{{reflist|refs=

<ref name=humphreys>{{cite journal|bibcode=1979ApJ...231..384H|title=M supergiants and the low metal abundances in the Small Magellanic Cloud|journal=Astrophysical Journal|volume=231|pages=384|last1=Humphreys|first1=R. M.|year=1979|doi=10.1086/157201}}</ref>

<ref name=tycho2>{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|last1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|year=2000}}</ref>

<ref name=2mass>{{cite web|title=2MASS|url=http://vizier.u-strasbg.fr/viz-bin/VizieR-S?2MASS%20J00505609-7215060|website=VizieR|publisher=Centre de Données astronomiques de Strasbourg|access-date=27 March 2017}}</ref>

<ref name=rv>{{cite journal|bibcode=2015A&A...578A...3G|title=A new survey of cool supergiants in the Magellanic Clouds|journal=Astronomy & Astrophysics|volume=578|pages=A3|last1=González-Fernández|first1=Carlos|last2=Dorda|first2=Ricardo|last3=Negueruela|first3=Ignacio|last4=Marco|first4=Amparo|year=2015|doi=10.1051/0004-6361/201425362|arxiv = 1504.00003 |s2cid=55959019}}</ref>

}}

{{Stars of Tucana}}

{{DEFAULTSORT:SMC 018136}}
[[Category:Stars in the Small Magellanic Cloud]]
[[Category:Tucana (constellation)]]
[[Category:M-type supergiants]]
[[Category:K-type supergiants]]
[[Category:2MASS objects|J00505609-7215060]]
[[Category:Extragalactic stars]]



{{Sourceattribution|SMC 018136}}