Upsilon Aquilae, Latinized from υ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. With an apparent visual magnitude of 5.91[4] it is a faint star but visible to the naked eye from suburban skies. It has an annual parallax shift of 18.66 mas,[1] indicating a distance of around 175 light-years (54 parsecs). The star is drifting closer with a radial velocity of –30 km/s.[5]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 45m 39.94732s[1] |
| Declination | 07° 36′ 47.3626″[1] |
| Apparent magnitude (V) | 5.889[2] |
| Characteristics | |
| Spectral type | A3 IV[3] |
| U−B color index | 0.09[4] |
| B−V color index | 0.18[4] |
| Astrometry | |
| Radial velocity (Rv) | −29.9±2.0[5] km/s |
| Proper motion (μ) | RA: 53.492[1] mas/yr Dec.: 0.021[1] mas/yr |
| Parallax (π) | 18.6614 ± 0.0975 mas[1] |
| Distance | 174.8 ± 0.9 ly (53.6 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.24[6] |
| Details | |
| Mass | 1.81±0.02[7] M☉ |
| Luminosity | 10.5[6] L☉ |
| Surface gravity (log g) | 4.21[2] cgs |
| Temperature | 7,906[2] K |
| Metallicity [Fe/H] | –0.05[2] dex |
| Rotational velocity (v sin i) | 42[7] km/s |
| Age | 180[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Aquilae is a subgiant star with a stellar classification of A3 IV.[3] The outer atmosphere is radiating energy into space with 10.5[6] times the Sun's luminosity from its photosphere at an effective temperature of 7,906 K,[2] which gives it the white-hot glow of an A-type star. It is 180[8] million years old with 1.8 times the mass of the Sun and is spinning relatively quickly with a projected rotational velocity of 42 km/s.[7]
References
edit- ^ a b c d e f 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 e Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
- ^ 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 c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Washington, Carnegie Institution of Washington: 0, Bibcode:1953GCRV..C......0W.
- ^ a b c 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 c Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ 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.
- ^ "* ups Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-21.