Omega1 Cygni

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
Distance| 1,260 ± 80 ly
(390 ± 20 pc)
Absolute magnitude (MV)| −2.65[8]
Details
Mass| 8.1±0.2[3] M☉
Radius| 4.55[9][lower-alpha 1] R☉
Luminosity| 1,549[9] L☉
Surface gravity (log g)| 2.312[10] cgs
Temperature| 16,982[9] K
Metallicity [Fe/H]| 0.0[8] dex
Rotational velocity (v sin i)| 145[11] km/s
Age| 33.2±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
SIMBAD| data

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.pngA 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=*+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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Constellation of Cygnus

* List of stars in Cygnus

Stars|

| Bayer|

* α (Deneb)
* β (Albireo)
* γ (Sadr)
* δ (Fawaris)
* ε (Aljanah)
* ζ
* η
* θ
* ι1
* ι2
* κ
* λ
* μ
* ν
* ξ
* π1 (Azelfafage)
* π2
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω1
* ω2
* P
* Q

|

Flamsteed|

* 2
* 4
* 8
* 9
* 14
* 15
* 16 (c)
* 17
* 20 (d)
* 22
* 23
* 26 (e)
* 27 (b1)
* 28 (b2)
* 29 (b3)
* 30
* 31
* 32
* 33
* 35
* 39
* 41
* 47
* 52
* 55
* 56
* 57
* 59 (f1)
* 61
* 63 (f2)
* 68 (A)
* 71 (g)
* 72
* 74
* 75

Variable|

* R
* T
* W
* RW
* SS
* TT
* BC
* BI
* CH
* KY
* V404
* V476
* V1057
* V1143
* V1191
* V1489
* V1500
* V1668
* V1974
* V2513

HR|

* 7633
* 7912
* 8193

HD|

* 185269
* 185435
* 187123
* 188753
* 191806

Gliese|

* 777
* 806
* 1245

Kepler|

* 5
* 6
* 11
* 15
* 16
* 17
* 18
* 22
* 23
* 27
* 28
* 29
* 31
* 32
* 33
* 34
* 35
* 36
* 39
* 40
* 41
* 42
* 43
* 44
* 45
* 47
* 51
* 56
* 61
* 66
* 67
* 68
* 69
* 70
* 78
* 80
* 84
* 86
* 89
* 107
* 182
* 186
* 223
* 371
* 419
* 432
* 451
* 452
* 1229
* 1520
* 1625

Other|

* AFGL 2591
* BD+40° 4210
* BD+43 3654
* Cygnus OB2 #8A
* Cygnus OB2 #12
* Cygnus X-1
* Cygnus X-3
* G 208-44
* G 208-45
* HAT-P-7
* HAT-P-11
* HAT-P-17
* KELT-9
* KIC 8462852
* KIC 9832227
* KIC 11026764
* KOI-74
* KOI-81
* KOI-256
* KPD 1930+2752
* MWC 349
* N6946-BH1
* NML Cygni
* PH1
* PSR J2032+4127
* W75N(B)-VLA2
* WISE J2000+3629
* WR 134
* WR 135
* WR 136
* WR 137
* WR 140
* WR 142
* WR 147
* WR 148

Former|

* 3

Star
clusters|

| Association|

* Cygnus OB2
* Cygnus OB7

|

Open|

* DR 6
* IC 5146
* Messier 29
* Messier 39
* NGC 6811
* NGC 6819
* NGC 6834
* NGC 6866
* NGC 6871
* NGC 6910

Molecular
clouds|

* Cygnus X (including DR 21)

Nebulae|

| Dark|

* Barnard 146
* Barnard 147
* IC 5146
* L1014

|

H II|

* NGC 6914
* North America Nebula
* Pelican Nebula
* Sadr Region
* Sh2-101
* Sh2-106

Planetary|

* Abell 78
* Egg Nebula
* IRAS 19475+3119
* Kronberger 61
* M1-92
* NGC 6826
* NGC 6881
* NGC 6884
* NGC 7008
* NGC 7026
* NGC 7027
* NGC 7048
* Soap Bubble Nebula

WR|

* Crescent Nebula

SNR|

* Cygnus Loop (including Veil Nebula)

Galaxies|

| NGC|

* 6801
* 6946
* 7013

|

Other|

* 3C 438
* Cygnus A

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