Phi1 Orionis

For other stars with this Bayer designation, see Phi Orionis.
φ1 Orionis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Orion
Right ascension 05h 34m 49.23804s[1]
Declination +09° 29′ 22.4878″[1]
Apparent magnitude (V) 4.42[2]
Characteristics
Spectral type B0 III[3]
U−B color index −0.97[2]
B−V color index −0.15[2]
Astrometry
Radial velocity (Rv)+33.2[4] km/s
Proper motion (μ) RA: +0.27[1] mas/yr
Dec.: −2.26[1] mas/yr
Parallax (π)3.00 ± 0.25[1] mas
Distance1,090 ± 90 ly
(330 ± 30 pc)
Absolute magnitude (MV)−3.53±0.30
Orbit[5]
Period (P)3,068.03 d
Eccentricity (e)0.22
Periastron epoch (T)2418051.8 JD
Argument of periastron (ω)
(secondary)		105°
Semi-amplitude (K1)
(primary)		13.3 km/s
Details[6]
Mass15.5±1.1 M☉
Radius6.3±1.0 R☉
Luminosity28,840 L☉
Surface gravity (log g)4.05±0.10 cgs
Temperature30,000±300 K
Rotational velocity (v sin i)20[7] km/s
Age7.2±0.8[8] Myr
Other designations
φ1 Ori, 37 Orionis, BD+09° 877, FK5 208, HD 36822, HIP 26176, HR 1876, SAO 112914.[9]

Phi1 Orionis, is a binary star system in the constellation Orion, positioned less than a degree to the south of Meissa.[10] It is visible to the naked eye with an apparent visual magnitude of 4.42.[2] The distance to this system, based upon an annual parallax shift of 3.0 mas,[1] is around 1,090 light years.

This is a single-lined[6] spectroscopic binary star system with an orbital period of 3,068 days and an eccentricity of 0.22.[5] It is a member of the young Lambda Orionis cluster[11] and is roughly 7 million years old.[8] The primary component is a B-type giant star with a stellar classification of B0 III.[3] It has over 15 times the mass of the Sun and around 6.3 times the Sun's radius.[6] Nothing is known about the secondary companion. It does not contribute a significant amount of light to the combined spectrum.[6]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Murdin, P.; Penston, M. V. (December 1977), "The Lambda Orionis association", Monthly Notices of the Royal Astronomical Society, 181: 657−665, Bibcode:1977MNRAS.181..657M, doi:10.1093/mnras/181.4.657.
  3. 1 2 Levato, H. (January 1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics Supplement Series, 19: 91–99, Bibcode:1975A&AS...19...91L.
  4. ↑ Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  5. 1 2 Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727, arXiv:astro-ph/0406573Freely accessible, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
  6. 1 2 3 4 Nieva, María-Fernanda; Przybilla, Norbert (2014), "Fundamental properties of nearby single early B-type stars", Astronomy & Astrophysics, 566: A7, arXiv:1412.1418Freely accessible, Bibcode:2014A&A...566A...7N, doi:10.1051/0004-6361/201423373.
  7. ↑ Simón-Díaz, S.; Herrero, A. (2014), "The IACOB project. I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening", Astronomy & Astrophysics, 562: A135, arXiv:1311.3360Freely accessible, Bibcode:2014A&A...562A.135S, doi:10.1051/0004-6361/201322758.
  8. 1 2 Tetzlaff, N.; et al. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410: 190, arXiv:1007.4883Freely accessible, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  9. ↑ "phi01 Ori -- Spectroscopic binary", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-11-29.
  10. ↑ O'Meara, Stephen James (2007), Deep-Sky Companions: Hidden Treasures, Cambridge University Press, p. 146, ISBN 113946373X.
  11. ↑ Hernández, Jesús; Calvet, Nuria; Hartmann, L.; Muzerolle, J.; Gutermuth, R.; Stauffer, J. (December 2009), "Spitzer Observations of the λ Orionis Cluster. I. The Frequency of Young Debris Disks at 5 Myr", The Astrophysical Journal, 707 (1): 705−715, arXiv:0910.3884Freely accessible, Bibcode:2009ApJ...707..705H, doi:10.1088/0004-637X/707/1/705.
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