Astronomy:69 Orionis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 06h 12m 03.27955s[1] |
| Declination | 16° 07′ 49.4614″[1] |
| Apparent magnitude (V) | 4.92[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B5Vn[3] |
| U−B color index | −0.59[2] |
| B−V color index | −0.12[2] |
| Astrometry | |
| Radial velocity (Rv) | +22.00[4] km/s |
| Proper motion (μ) | RA: +5.49[1] mas/yr Dec.: −16.80[1] mas/yr |
| Parallax (π) | 6.17 ± 0.25[1] mas |
| Distance | 530 ± 20 ly (162 ± 7 pc) |
| Absolute magnitude (MV) | −1.09[5] |
| Details[6] | |
| Mass | 6.4±0.2 M☉ |
| Radius | 3.4[7] R☉ |
| Luminosity | 1,442+248 −212 L☉ |
| Surface gravity (log g) | 4.05±0.17 cgs |
| Temperature | 17,090 K |
| Metallicity [Fe/H] | +0.01[8] dex |
| Rotational velocity (v sin i) | 285±23 km/s |
| Age | 10–40[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
69 Orionis is a single[11] star in the equatorial constellation of Orion, positioned a couple of degrees to the north of Xi Orionis. It has the Bayer designation f1 Orionis; 69 Orionis is the Flamsteed designation. The star is visible to the naked eye as faint, blue-white hued point of light with an apparent visual magnitude of 4.92.[2] It is located approximately 530 light-years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[4] In 2015, H. Bouy and J. Alves suggested that it is a member of the newly discovered Taurion OB association.[9]
This object is a B-type main-sequence star with a stellar classification of B5Vn,[3] where the 'n' suffix indicates "nebulous" (broad) lines due to rapid rotation. It has a projected rotational velocity of 285 km/s, compared to a critical velocity of 476±37 km/s; the polar axis is inclined by 64°±16°.[6] This is a known Be star[12] that began behaving as a normal star in November, 1982.[13] It has 6.4 times the mass of the Sun and is radiating around 1,442 times the Sun's luminosity from its photosphere at an effective temperature of 17,090 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (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 2.3 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. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 Lesh, Janet Rountree (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". Astrophysical Journal Supplement 17: 371. doi:10.1086/190179. Bibcode: 1968ApJS...17..371L.
- ↑ 4.0 4.1 Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications 30: 57. Bibcode: 1967IAUS...30...57E.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 6.0 6.1 6.2 Zorec, J. et al. (2016). "Critical study of the distribution of rotational velocities of Be stars". Astronomy & Astrophysics 595: A132. doi:10.1051/0004-6361/201628760. Bibcode: 2016A&A...595A.132Z.
- ↑ Pasinetti Fracassini, L. E. et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics 367 (2): 521–524. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. Vizier catalog entry
- ↑ 9.0 9.1 Bouy, H.; Alves, J. (December 2015). "Cosmography of OB stars in the solar neighbourhood". Astronomy & Astrophysics 584: 13. doi:10.1051/0004-6361/201527058. A26. Bibcode: 2015A&A...584A..26B.
- ↑ "69 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=69+Ori.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Bossi, M. et al. (November 1981). "Spectroscopic and photometric observations of the Be star 69 Orionis". Astronomy and Astrophysics Supplement Series 46: 173–177. Bibcode: 1981A&AS...46..173B.
- ↑ Goraya, P. S.; Tur, N. S. (February 1996). "Spectrophotometric Study of Four Bright Be Stars". Astrophysics and Space Science 236 (2): 175–183. doi:10.1007/BF00645142. Bibcode: 1996Ap&SS.236..175G.
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