69 Orionis

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 article is about f1 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  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
Distance530 ± 20 ly
(162 ± 7 pc)
Absolute magnitude (MV)–1.09[5]
Details[6]
Mass6.4±0.2 M☉
Radius3.4[7] R☉
Luminosity1,442+248
−212 L☉
Surface gravity (log g)4.05±0.17 cgs
Temperature17,090 K
Metallicity [Fe/H]+0.01[8] dex
Rotational velocity (v sin i)285±23 km/s
Age10–40[9] Myr
Other designations
f1 Ori, 69 Ori, BD+16°1035, GC 7891, HD 42545, HIP 29434, HR 2198, SAO 95365[10]
Database references
SIMBADdata

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 1442 times the Sun's luminosity from its photosphere at an effective temperature of 17,090 K.[6]

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.
  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. 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.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics (Third ed.). 367 (2): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  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. 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.
  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.
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