Omega1 Aquarii, Latinized from ω1 Aquarii, is the Bayer designation for a binary star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 4.96,[2] this star is faintly visible to the naked eye from the suburbs. The distance to this star can be estimated from the parallax as approximately 138 light-years (42 parsecs).[1]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 39m 47.06545s[1] |
| Declination | –14° 13′ 19.7374″[1] |
| Apparent magnitude (V) | 4.96[2] |
| Characteristics | |
| Spectral type | A7 IV[3] |
| B−V color index | +0.25[2] |
| Astrometry | |
| Radial velocity (Rv) | –2[4] km/s |
| Proper motion (μ) | RA: +54.147[1] mas/yr Dec.: −50.151[1] mas/yr |
| Parallax (π) | 23.5523 ± 0.4848 mas[1] |
| Distance | 138 ± 3 ly (42.5 ± 0.9 pc) |
| Absolute magnitude (MV) | +1.78[5] |
| Details | |
| ω1 Aqr | |
| Mass | 1.88±0.04[6] 1.72[7] M☉ |
| Radius | 2.44+0.11 −0.25[1] R☉ |
| Luminosity | 14.8±0.3[1] L☉ |
| Temperature | 7,249+399 −150 K |
| Rotational velocity (v sin i) | 105[8] km/s |
| Age | 790 Myr[9] 600[10] Myr |
| ω1 Aqr B | |
| Mass | 0.85[7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of this star is A7 IV,[3] matching a subgiant star. It is spinning rapidly with a projected rotational velocity of 105 km/s.[8] The star is about 600[10] million years old and is radiating 15[1] times the Sun's luminosity. It has 1.9[6] times the mass of the Sun and 2.4[1] times the Sun's radius. Previously thought to be a single star,[9] in 2022 it was discovered to have a smaller companion, making it a binary star. The secondary star has a projected separation of about 1 astronomical unit away from the primary star.[7]
References
edit- ^ a b c d e f g h i j 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 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- ^ 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.
- ^ a b 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 c Waisberg, Idel; Klein, Ygal; Katz, Boaz (2023). "Binarity and beyond in a stars – I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia–Hipparcos accelerations". Monthly Notices of the Royal Astronomical Society. 521 (4): 5232–5254. arXiv:2206.05251. Bibcode:2023MNRAS.521.5232W. doi:10.1093/mnras/stad872.
- ^ a b Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ a b De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
- ^ a b Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135, S2CID 118539505.
- ^ "* ome01 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24.