Astronomy:Theta1 Orionis C
 Theta1 Orionis C and companions in the Trapezium cluster | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 35m 16.46375s[1] |
| Declination | −05° 23′ 22.8486″[1] |
| Apparent magnitude (V) | 5.13[2] |
| Characteristics | |
| Spectral type | θ1 Orionis C1: O6Vp[3] θ1 Orionis C2: B0V[4] |
| U−B color index | −0.95[2] |
| B−V color index | +0.02[2] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | +23.6 ± 2.0[6] km/s |
| Proper motion (μ) | RA: −4.13[1] mas/yr Dec.: 6.82[1] mas/yr |
| Parallax (π) | 2.11 ± 0.41[1] mas |
| Distance | 410 ± 20[7] pc |
| Absolute magnitude (MV) | −4.9[8] |
| Details | |
| C1 | |
| Mass | 33 ± 5[4] M☉ |
| Radius | 10.6 ± 1.5[8] R☉ |
| Luminosity | 204,000[8] L☉ |
| Surface gravity (log g) | 4.1[8] cgs |
| Temperature | 39,000 ± 1,000[8] K |
| Rotational velocity (v sin i) | 24 ± 3[8] km/s |
| Age | 2.5 ± 0.5[8] Myr |
| C2 | |
| Mass | 11 ± 5[4] M☉ |
| Orbit[7] | |
| Primary | C1 |
| Companion | C2 |
| Period (P) | 11.05 ± 0.03 yr |
| Semi-major axis (a) | 40.00 ± 3.00″ |
| Eccentricity (e) | 0.534 ± 0.050 |
| Inclination (i) | 100.7 ± 1.0° |
| Longitude of the node (Ω) | 25.3 ± 1.5° |
| Argument of periastron (ω) (secondary) | 290.9 ± 2.5° |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta1 Orionis C (θ1 Orionis C) is a member of the Trapezium 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 O class blue main sequence star with a B-type main sequence companion. Its high luminosity and large distance (about 1,500 light years) give it an apparent visible magnitude of 5.1.
Theta1 Orionis consists of multiple components, primarily the four stars of the Trapezium cluster, all within one arc-minute of each other. Theta2 Orionis is a more distant grouping of three main stars plus several fainter companions, 1-2 arc-minutes from Theta1.
Theta1 C is itself a binary of two massive stars, C1 and C2, plus a very close fainter companion apparently escaping the system.[9]
Theta1 Orionis C1 is responsible for generating most of the ultraviolet light that is slowly ionizing (and perhaps 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 stellar wind that is a hundred thousand times stronger than the Sun's, and the outpouring gas moves at 1,000 km/s.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode: 2002yCat.2237....0D.
- ↑ "Science Source Stock Video - Trapezium C1 main sequence star, animation". https://www.sciencesource.com/archive/Trapezium-C1-main-sequence-star--animation-SS273386.html.
- ↑ 4.0 4.1 4.2 Balega, Yu. Yu.; Chentsov, E. L.; Leushin, V. V.; Rzaev, A. Kh.; Weigelt, G. (2014). "Young massive binary θ 1 OriC: Radial velocities of components". Astrophysical Bulletin 69 (1): 46–57. doi:10.1134/S1990341314010052. ISSN 1990-3413. Bibcode: 2014AstBu..69...46B.
- ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1: 02025. Bibcode: 2009yCat....102025S.
- ↑ Olivares, J.; Sánchez, L. J.; Ruelas-Mayorga, A.; Allen, C.; Costero, R.; Poveda, A. (2013). "Kinematics of the Orion Trapezium Based on Diffracto-Astrometry and Historical Data". The Astronomical Journal 146 (5): 106. doi:10.1088/0004-6256/146/5/106. ISSN 0004-6256. Bibcode: 2013AJ....146..106O.
- ↑ 7.0 7.1 Kraus, S.; Weigelt, G.; Balega, Y. Y.; Docobo, J. A.; Hofmann, K.-H.; Preibisch, T.; Schertl, D.; Tamazian, V. S. et al. (2009). "Tracing the young massive high-eccentricity binary system θ1Orionis C through periastron passage". Astronomy and Astrophysics 497 (1): 195–207. doi:10.1051/0004-6361/200810368. ISSN 0004-6361. Bibcode: 2009A&A...497..195K.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 Simón-Díaz, S.; Herrero, A.; Esteban, C.; Najarro, F. (2006). "Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula". Astronomy and Astrophysics 448 (1): 351–366. doi:10.1051/0004-6361:20053066. ISSN 0004-6361. Bibcode: 2006A&A...448..351S.
- ↑ Vitrichenko, E. A.; Lehmann, H.; Klochkova, V.; Bychkova, L.; Bychkov, V. (2010). "Detection of a star escaping from the Orion Trapezium". Astrophysics 53 (2): 306–308. doi:10.1007/s10511-010-9120-2. ISSN 0571-7256. Bibcode: 2010Ap.....53..306V.
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