Astronomy:Omega1 Cygni

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Short description: B-type subgiant star in the constellation Cygnus


For other stars with this Bayer designation, see ω Cygni.
Omega1 Cygni
Location of ω1 Cygni (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  20h 30m 03.54116s[1]
Declination +48° 57′ 05.6446″[1]
Apparent magnitude (V) +4.93 - 4.96[2]
Characteristics
Spectral type B2.5 IV[3]
U−B color index −0.68[4]
B−V color index −0.09[4]
Variable type β Cep[5] (λ Eri[2])
Astrometry
Radial velocity (Rv)−21.9±2.0[6] km/s
Proper motion (μ) RA: +10.883[7] mas/yr
Dec.: +7.057[7] mas/yr
Parallax (π)2.5878 ± 0.1637[7] mas
Distance1,260 ± 80 ly
(390 ± 20 pc)
Absolute magnitude (MV)−2.65[8]
Details
Mass8.1±0.2[3] M☉
Radius4.55[9][lower-alpha 1] R☉
Luminosity1,549[9] L☉
Surface gravity (log g)2.312[10] cgs
Temperature16,982[9] K
Metallicity [Fe/H]0.0[8] dex
Rotational velocity (v sin i)145[11] 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[12]
Database references
SIMBADdata

Omega1 Cygni, Latinized from ω1 Cygni, is the Bayer designation for a solitary[13] star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 4.94.[4] Based upon an annual parallax shift of 2.59 mas,[7] it is estimated to lie roughly 1,260 light years from the Sun. Relative to its neighbors, this star has a peculiar velocity of 25.7±2.2 km/s.[6]

File:V2014CygLightCurve.png
A light curve for V2014 Cygni, plotted from TESS data[14]

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.[5] Its brightness varies irregularly by 0.034 magnitude every 1.137 days.[15]

Notes

  1. ↑ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:(5,77216,982)4⋅1.549=4.55 R⊙.

References

  1. ↑ 1.0 1.1 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. ↑ 2.0 2.1 V2014 Cygni, https://www.aavso.org/vsx/index.php?view=detail.top&oid=12934, retrieved 2020-09-02 
  3. ↑ 3.0 3.1 3.2 3.3 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 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T. 
  4. ↑ 4.0 4.1 4.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M. 
  5. ↑ 5.0 5.1 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, doi:10.1051/0004-6361:20054730, Bibcode: 2006A&A...452..945T. 
  6. ↑ 6.0 6.1 Bobylev, V. V.; Bajkova, A. T. (August 2013), "Galactic kinematics from a sample of young massive stars", Astronomy Letters 39 (8): 532–549, doi:10.1134/S106377371308001X, Bibcode: 2013AstL...39..532B. 
  7. ↑ 7.0 7.1 7.2 7.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 9.2 Simón-Díaz, S.; Godart, M.; Castro, N.; Herrero, A.; Aerts, C.; Puls, J.; Telting, J.; Grassitelli, L. (2017), "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars", Astronomy and Astrophysics 597: A22, doi:10.1051/0004-6361/201628541, Bibcode: 2017A&A...597A..22S. 
  10. ↑ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017), "Fundamental parameters and infrared excesses of Tycho–Gaia stars", Monthly Notices of the Royal Astronomical Society 471 (1): 770–791, doi:10.1093/mnras/stx1433, Bibcode: 2017MNRAS.471..770M. 
  11. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A. 
  12. ↑ "* ome01 Cyg -- Pulsating variable Star". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+ome01+Cyg+--+Pulsating+variable+Star. 
  13. ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  14. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  15. ↑ Lefèvre, L. et al. (2009), "A systematic study of variability among OB-stars based on HIPPARCOS photometry", Astronomy and Astrophysics 507 (2): 1141, doi:10.1051/0004-6361/200912304, Bibcode: 2009A&A...507.1141L. 



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