View source for Astronomy:Theta1 Orionis C

{{Short description|Multiple star in the constellation Orion}}
{{DISPLAYTITLE:Theta<sup>1</sup> Orionis C}}
{{Starbox begin
| name=Theta<sup>1</sup> Orionis C}}
{{Starbox image |
  image=[[Image:TrapeziumStars.jpg|280px]] |
  caption=Theta<sup>1</sup> Orionis C and companions in the Trapezium cluster
}}
{{Starbox observe
| epoch=J2000
| ra={{RA|05|35|16.46375}}<ref name=hipparcos>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}</ref>
| dec={{DEC|&minus;05|23|22.8486}}<ref name=hipparcos/>
| appmag_v=5.13<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|pages=0|last1=Ducati|first1=J. R.|year=2002}}</ref>
| constell=[[Astronomy:Orion (constellation)|Orion]] }}
{{Starbox character
| class={{nowrap|θ<sup>1</sup> Orionis C1: O6Vp<ref>{{Cite web|url=https://www.sciencesource.com/archive/Trapezium-C1-main-sequence-star--animation-SS273386.html|title = Science Source Stock Video - Trapezium C1 main sequence star, animation}}</ref>}}<br/>
θ<sup>1</sup> Orionis C2: B0V<ref name=balega2014>{{cite journal|last1=Balega|first1=Yu. Yu.|last2=Chentsov|first2=E. L.|last3=Leushin|first3=V. V.|last4=Rzaev|first4=A. Kh.|last5=Weigelt|first5=G.|title=Young massive binary θ 1 OriC: Radial velocities of components|journal=Astrophysical Bulletin|volume=69|issue=1|year=2014|pages=46–57|issn=1990-3413|doi=10.1134/S1990341314010052|bibcode=2014AstBu..69...46B|s2cid=120838635}}</ref>
| b-v=+0.02<ref name=ducati/>
| u-b=&minus;0.95<ref name=ducati/>
| variable=suspected<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=02025|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009|display-authors=0}}</ref>
}}
{{Starbox astrometry
| radial_v=+23.6 ± 2.0<ref name="OlivaresSánchez2013">{{cite journal|last1=Olivares|first1=J.|last2=Sánchez|first2=L. J.|last3=Ruelas-Mayorga|first3=A.|last4=Allen|first4=C.|last5=Costero|first5=R.|last6=Poveda|first6=A.|title=Kinematics of the Orion Trapezium Based on Diffracto-Astrometry and Historical Data|journal=The Astronomical Journal|volume=146|issue=5|year=2013|pages=106|issn=0004-6256|doi=10.1088/0004-6256/146/5/106|bibcode=2013AJ....146..106O|arxiv = 1310.0769 |s2cid=119110490}}</ref>
| prop_mo_ra=&minus;4.13<ref name=hipparcos/>
| prop_mo_dec=6.82<ref name=hipparcos/>
| parallax=2.11
| p_error=0.41
| parallax_footnote=<ref name=hipparcos/>
| dist_pc=410 ± 20<ref name=kraus2009/>
| absmag_v=&minus;4.9<ref name="Simón-DíazHerrero2006">{{cite journal|last1=Simón-Díaz|first1=S.|last2=Herrero|first2=A.|last3=Esteban|first3=C.|last4=Najarro|first4=F.|title=Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula|journal=Astronomy and Astrophysics|volume=448|issue=1|year=2006|pages=351–366|issn=0004-6361|doi=10.1051/0004-6361:20053066|bibcode=2006A&A...448..351S|arxiv=astro-ph/0510288|s2cid=16445304}}</ref>
}}
{{Starbox detail
| component1=C1
| mass=33 ± 5<ref name=balega2014/>
| radius=10.6 ± 1.5<ref name="Simón-DíazHerrero2006"/>
| luminosity=204,000<ref name="Simón-DíazHerrero2006"/>
| temperature=39,000 ± 1,000<ref name="Simón-DíazHerrero2006"/>
| metal=
| gravity=4.1<ref name="Simón-DíazHerrero2006"/>
| rotational_velocity=24 ± 3<ref name="Simón-DíazHerrero2006"/>
| age_myr=2.5 ± 0.5<ref name="Simón-DíazHerrero2006"/>
| component2=C2
| mass2=11 ± 5<ref name=balega2014/>
}}
{{Starbox orbit
| reference=<ref name=kraus2009>{{cite journal|last1=Kraus|first1=S.|last2=Weigelt|first2=G.|last3=Balega|first3=Y. Y.|last4=Docobo|first4=J. A.|last5=Hofmann|first5=K.-H.|last6=Preibisch|first6=T.|last7=Schertl|first7=D.|last8=Tamazian|first8=V. S.|last9=Driebe|first9=T.|last10=Ohnaka|first10=K.|last11=Petrov|first11=R.|last12=Schöller|first12=M.|last13=Smith|first13=M.|title=Tracing the young massive high-eccentricity binary system θ1Orionis C through periastron passage|journal=Astronomy and Astrophysics|volume=497|issue=1|year=2009|pages=195–207|issn=0004-6361|doi=10.1051/0004-6361/200810368|bibcode=2009A&A...497..195K|arxiv = 0902.0365 |s2cid=14555075}}</ref>
| primary=C1
| name=C2
| period=11.05 ± 0.03
| period_unitless=
| axis=40.00 ± 3.00
| axis_unitless=
| eccentricity=0.534 ± 0.050
| inclination=100.7 ± 1.0
| node=25.3 ± 1.5
| periastron=
| periarg=290.9 ± 2.5
| periarg_primary=
| k1=
| k2=
}}
{{Starbox catalog
| names=[[Astronomy:Flamsteed designation|41]] Ori C, HR&nbsp;1895, HD&nbsp;37022, [[Astronomy:Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;132314, HIP&nbsp;26221, BD–05°&nbsp;1315C
}}
{{Starbox reference |
  Simbad=HD+37022
}}
{{Starbox end}}
[[File:GRAVITY discovers new double star in Orion Trapezium Cluster.jpg|thumb|left|θ<sup>1</sup> Orionis C is seen as a double star (right inset) with VLTI near-infrared interferometry]]
'''Theta<sup>1</sup> Orionis C''' (θ<sup>1</sup> Orionis C) is a member of the Trapezium [[Astronomy:Open cluster|open cluster]] that lies within the Orion Nebula. The star ''C'' is the most massive of the four bright stars at the heart of the cluster. It is an [[Astronomy:O-type main-sequence star|O class blue main sequence star]] with a B-type [[Astronomy:Main sequence|main sequence]] companion.  Its high luminosity and large distance (about 1,500 [[Light year|light year]]s) give it an apparent visible magnitude of 5.1.

Theta<sup>1</sup> Orionis consists of multiple components, primarily the four stars of the Trapezium cluster, all within one arc-minute of each other.  [[Astronomy:Theta2 Orionis|Theta<sup>2</sup> Orionis]] is a more distant grouping of three main stars plus several fainter companions, 1-2 arc-minutes from Theta<sup>1</sup>.

Theta<sup>1</sup> C is itself a binary of two massive stars, C1 and C2, plus a very close fainter companion apparently escaping the system.<ref name="VitrichenkoLehmann2010">{{cite journal|last1=Vitrichenko|first1=E. A.|last2=Lehmann|first2=H.|last3=Klochkova|first3=V.|last4=Bychkova|first4=L.|last5=Bychkov|first5=V.|title=Detection of a star escaping from the Orion Trapezium|journal=Astrophysics|volume=53|issue=2|year=2010|pages=306–308|issn=0571-7256|doi=10.1007/s10511-010-9120-2|bibcode=2010Ap.....53..306V|s2cid=123527966}}</ref>

Theta<sup>1</sup> Orionis C1 is responsible for generating most of the [[Physics:Ultraviolet|ultraviolet]] light that is slowly [[Physics:Ionization|ionizing]] (and perhaps [[Astronomy:Photoevaporation|photoevaporating]]) the Orion Nebula. This UV light is also the primary cause of the glow that illuminates the Orion Nebula. The star emits a powerful [[Astronomy:Stellar wind|stellar wind]] that is a hundred thousand times stronger than the [[Astronomy:Sun|Sun]]'s, and the outpouring gas moves at 1,000&nbsp;km/s.

==References==
{{Reflist}}

{{Stars of Orion}}

[[Category:Bayer objects|Orionis, Theta1, C]]
[[Category:Flamsteed objects|Orionis, 41, C]]
[[Category:Binary stars]]
[[Category:O-type main-sequence stars]]
[[Category:Orion (constellation)]]
[[Category:B-type main-sequence stars]]
[[Category:Henry Draper Catalogue objects|037022]]
[[Category:Bright Star Catalogue objects|1895]]
[[Category:Durchmusterung objects]]
[[Category:Hipparcos objects|026221]]

{{Sourceattribution|Theta1 Orionis C}}