Omega1 Cygni

For other star systems with this Bayer designation, see ω Cygni.
Omega1 Cygni
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 20h 30m 03.54116s[1]
Declination +48° 57′ 05.6446″[1]
Apparent magnitude (V) +4.94[2]
Characteristics
Spectral type B2.5 IV[3]
U−B color index −0.68[2]
B−V color index −0.09[2]
Variable type β Cep[4]
Astrometry
Radial velocity (Rv)−21.9±2.0[5] km/s
Proper motion (μ) RA: +10.63[1] mas/yr
Dec.: +7.22[1] mas/yr
Parallax (π)3.59 ± 0.18[1] mas
Distance910 ± 50 ly
(280 ± 10 pc)
Absolute magnitude (MV)−2.28[6]
Details
Mass8.1±0.2[3] M☉
Luminosity972[7] L☉
Luminosity (bolometric)5,924[8] L☉
Temperature19,525[8] K
Rotational velocity (v sin i)145[9] km/s
Age33.2±4.5[3] Myr
Other designations
ω1 Cyg, 45 Cygni, BD+48° 3142, FK5 3641, HD 195556, HIP 101138, HR 7844, SAO 49712, V2014 Cygni.[10]
Database references
SIMBADdata

Omega1 Cygni, Latinized from ω1 Cygni, is the Bayer designation for a solitary[11] star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 4.94.[2] Based upon an annual parallax shift of 3.59 mas,[1] it is estimated to lie roughly 950 light years from the Sun. Relative to its neighbors, this star has a peculiar velocity of 25.7±2.2 km/s.[5]

This is a somewhat evolved B-type subgiant star with a stellar classification of B2.5 IV.[3] Telting and colleagues report it as a Beta Cephei variable with a high degree of confidence as they found regular pulsations in its spectrum in a high-resolution spectroscopy study published in 2006.[4] Its brightness varies irregularly by 0.034 magnitude every 1.137 days.[12]

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:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. 1 2 3 4 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:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  4. 1 2 Telting, J. H.; et al. (June 2006), "A high-resolution spectroscopy survey of β Cephei pulsations in bright stars", Astronomy and Astrophysics, 452 (3): 945–953, Bibcode:2006A&A...452..945T, doi:10.1051/0004-6361:20054730.
  5. 1 2 Bobylev, V. V.; Bajkova, A. T. (August 2013), "Galactic kinematics from a sample of young massive stars", Astronomy Letters, 39 (8): 532–549, arXiv:1307.1677, Bibcode:2013AstL...39..532B, doi:10.1134/S106377371308001X.
  6. ↑ 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.
  7. ↑ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. 1 2 Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  9. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  10. ↑ "* ome01 Cyg -- Pulsating variable Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-22.
  11. ↑ 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.
  12. ↑ Lefèvre, L.; et al. (2009), "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Astronomy and Astrophysics, 507 (2): 1141, Bibcode:2009A&A...507.1141L, doi:10.1051/0004-6361/200912304.
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