Astronomy:Omega1 Cygni
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Short description: B-type subgiant star in the constellation Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 30m 03.54116s[2] |
| Declination | +48° 57′ 05.6446″[2] |
| Apparent magnitude (V) | +4.93 - 4.96[3] |
| Characteristics | |
| Spectral type | B2.5 IV[4] |
| U−B color index | −0.68[5] |
| B−V color index | −0.09[5] |
| Variable type | β Cep[6] (λ Eri[3]) |
| Astrometry | |
| Radial velocity (Rv) | −21.9±2.0[7] km/s |
| Proper motion (μ) | RA: +10.883[8] mas/yr Dec.: +7.057[8] mas/yr |
| Parallax (π) | 2.5878 ± 0.1637[8] mas |
| Distance | 1,260 ± 80 ly (390 ± 20 pc) |
| Absolute magnitude (MV) | −2.65[9] |
| Details | |
| Mass | 8.1±0.2[4] M☉ |
| Radius | 13.825[10] R☉ |
| Luminosity | 1,549[11] L☉ |
| Surface gravity (log g) | 2.312[10] cgs |
| Temperature | 16,982[11] K |
| Metallicity [Fe/H] | 0.0[9] dex |
| Rotational velocity (v sin i) | 145[12] km/s |
| Age | 33.2±4.5[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omega1 Cygni, Latinized from ω1 Cygni, is the Bayer designation for a solitary[14] star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 4.94.[5] Based upon an annual parallax shift of 2.59 mas,[8] 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.[7]
This is a somewhat evolved B-type subgiant star with a stellar classification of B2.5 IV.[4] 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.[6] Its brightness varies irregularly by 0.034 magnitude every 1.137 days.[15]
See also
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 V2014 Cygni, https://www.aavso.org/vsx/index.php?view=detail.top&oid=12934, retrieved 2020-09-02
- ↑ 4.0 4.1 4.2 4.3 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.
- ↑ 5.0 5.1 5.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 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.
- ↑ 8.0 8.1 8.2 8.3 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.
- ↑ 9.0 9.1 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.
- ↑ 10.0 10.1 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.
- ↑ 11.0 11.1 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.
- ↑ 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.
- ↑ "* 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.
- ↑ 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.
- ↑ 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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