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69 Orionis

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Star in the constellation Orion This article is about f Orionis. For other stars with this Bayer designation, see f Orionis.
69 Orionis
Location of 69 Orionis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 06 12 03.27955
Declination 16° 07′ 49.4614″
Apparent magnitude (V) 4.92
Characteristics
Evolutionary stage main sequence
Spectral type B5Vn
U−B color index −0.59
B−V color index −0.12
Astrometry
Radial velocity (Rv)+22.00 km/s
Proper motion (μ) RA: +5.49 mas/yr
Dec.: −16.80 mas/yr
Parallax (π)6.17 ± 0.25 mas
Distance530 ± 20 ly
(162 ± 7 pc)
Absolute magnitude (MV)−1.09
Details
Mass6.4±0.2 M☉
Radius3.4 R☉
Luminosity1,442+248
−212 L☉
Surface gravity (log g)4.05±0.17 cgs
Temperature17,090 K
Metallicity +0.01 dex
Rotational velocity (v sin i)285±23 km/s
Age10–40 Myr
Other designations
f Ori, 69 Ori, BD+16°1035, GC 7891, HD 42545, HIP 29434, HR 2198, SAO 95365
Database references
SIMBADdata

69 Orionis is a single star in the equatorial constellation of Orion, positioned a couple of degrees to the north of Xi Orionis. It has the Bayer designation f 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. It is located approximately 530 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s. In 2015, H. Bouy and J. Alves suggested that it is a member of the newly discovered Taurion OB association.

This object is a B-type main-sequence star with a stellar classification of B5Vn, 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°. This is a known Be star that began behaving as a normal star in November, 1982. 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.

References

  1. ^ 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.
  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. Bibcode:2002yCat.2237....0D.
  3. ^ Lesh, Janet Rountree (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". Astrophysical Journal Supplement. 17: 371. Bibcode:1968ApJS...17..371L. doi:10.1086/190179.
  4. ^ 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.
  5. 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
  6. ^ Zorec, J.; et al. (2016). "Critical study of the distribution of rotational velocities of Be stars". Astronomy & Astrophysics. 595: A132. Bibcode:2016A&A...595A.132Z. doi:10.1051/0004-6361/201628760. hdl:11336/37946.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics. 367 (2) (Third ed.): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  8. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778. Vizier catalog entry
  9. ^ Bouy, H.; Alves, J. (December 2015). "Cosmography of OB stars in the solar neighbourhood". Astronomy & Astrophysics. 584: 13. Bibcode:2015A&A...584A..26B. doi:10.1051/0004-6361/201527058. A26.
  10. "69 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-06.
  11. 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  12. 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.
  13. Goraya, P. S.; Tur, N. S. (February 1996). "Spectrophotometric Study of Four Bright Be Stars". Astrophysics and Space Science. 236 (2): 175–183. Bibcode:1996Ap&SS.236..175G. doi:10.1007/BF00645142. S2CID 123576634.
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