11 Orionis is a solitary[10] Ap star in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye with an apparent visual magnitude of 4.65,[7] and it is located approximately 365 light years away from the Sun based on parallax.[1] The star is moving further from the Sun with a heliocentric radial velocity of +16.8 km/s.[6]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 04m 34.14916s[1] |
| Declination | +15° 24′ 14.7771″[1] |
| Apparent magnitude (V) | [2] 4.65 |
| Characteristics | |
| Spectral type | B9 IV[3] or A1 Vp SiCr[4] |
| U−B color index | −0.10[5] |
| B−V color index | −0.06[5] |
| Variable type | α² CVn[2] |
| Astrometry | |
| Radial velocity (Rv) | +16.80[6] km/s |
| Proper motion (μ) | RA: +17.80[1] mas/yr Dec.: −31.15[1] mas/yr |
| Parallax (π) | 8.93 ± 0.24 mas[1] |
| Distance | 365 ± 10 ly (112 ± 3 pc) |
| Absolute magnitude (MV) | −0.59[7] |
| Details | |
| Mass | 2.7[8] M☉ |
| Radius | 4.3[8] R☉ |
| Luminosity | 220[7] L☉ |
| Surface gravity (log g) | 3.6[8] cgs |
| Temperature | 9,520[3] K |
| Rotational velocity (v sin i) | 63.3±3.6[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is a chemically peculiar star, known as an Ap star, with enhanced silicon and chromium lines in its spectrum.[12] It is an α² CVn variable, ranging from 4.65 to 4.69 magnitude with a period of 4.64 days.[2] The magnetic field measured from metal lines has a strength of +160±390 G.[13]
References
edit- ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c Samus, N. N.; Durlevich, O. V.; 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. Bibcode:2009yCat....102025S.
- ^ a b Zorec, J.; Cidale, L.; Arias, M. L.; Frémat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff". Astronomy and Astrophysics. 501 (1): 297–320. arXiv:0903.5134. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147. S2CID 14969137.
- ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- ^ a b Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
- ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. ISBN 9780598216885. LCCN 54001336.
- ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
- ^ a b c d Moiseeva, A. V.; et al. (January 2019). "Fundamental Parameters of CP Stars Observed at the 6-m Telescope. I. Observations in 2009–2011". Astrophysical Bulletin. 74 (1): 62–65. Bibcode:2019AstBu..74...62M. doi:10.1134/S1990341319010061.
- ^ "11 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 September 2012.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- ^ Stigler, Ch.; Maitzen, H. M.; Paunzen, E.; Netopil, M. (2014). "Spectrophotometric analysis of the 5200 Å region for peculiar and normal stars". Astronomy & Astrophysics. 562: A65. arXiv:1402.1021. Bibcode:2014A&A...562A..65S. doi:10.1051/0004-6361/201322300. S2CID 55166743.
- ^ Romanyuk, I. I.; et al. (July 2016). "Results of magnetic field measurements of CP-stars performed with the 6-m telescope. III. Observations in 2009". Astrophysical Bulletin. 71 (3): 302–313. Bibcode:2016AstBu..71..302R. doi:10.1134/S1990341316030056. S2CID 125202761.