Omega1 Aquilae, which is Latinized from ω1 Aquilae, is the Bayer designation for a single[8] star in the equatorial constellation of Aquila. With an apparent visual magnitude of 5.2[2] it is a faint, yellow-white hued star that can be seen with the naked eye in dark skies. From the annual parallax shift of 8.53 mas,[1] the distance to this star can be estimated as 382 light-years (117 parsecs), give or take a 6 light year margin of error. It is drifting closer to the Sun with a radial velocity of −14 km/s.[5]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 17m 48.99957s[1] |
| Declination | 11° 35′ 43.5234″[1] |
| Apparent magnitude (V) | 5.284[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | F0 IV[4] |
| U−B color index | 0.204[2] |
| B−V color index | 0.238[2] |
| Astrometry | |
| Radial velocity (Rv) | −14.3[5] km/s |
| Proper motion (μ) | RA: 0.706[1] mas/yr Dec.: 13.947[1] mas/yr |
| Parallax (π) | 8.5341 ± 0.1401 mas[1] |
| Distance | 382 ± 6 ly (117 ± 2 pc) |
| Absolute magnitude (MV) | −0.24[6] |
| Details | |
| Mass | 2.85±0.06[3] M☉ |
| Radius | 5.08 0.34 −0.25[1] R☉ |
| Luminosity | 84.7±1.6[1] L☉ |
| Temperature | 7,766 206 −245[1] K |
| Rotational velocity (v sin i) | 89[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of this star fits a stellar classification of F0 IV.[4] Typically, a luminosity class of IV means that the star is in the subgiant stage. It is rotating rapidly with a projected rotational velocity of 115 km/s. This is causing an equatorial bulge that is 5% larger than the polar radius.[9] The star has 2.85[3] times the mass of the Sun and five[1] times the Sun's radius. It is radiating 85 times the luminosity of the Sun from its photosphere at an effective temperature of 7,766 K.[1]
References
edit- ^ a b c d e f g h i j k Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, Bibcode:1966PDAUC...1....1G.
- ^ a b c d Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
- ^ 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, S2CID 119257644.
- ^ "ome01 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-28.
- ^ 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, S2CID 14878976.
- ^ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.