Astronomy:Upsilon Aquilae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 19h 45m 39.947s[2] |
| Declination | +07° 36′ 47.37″[2] |
| Apparent magnitude (V) | +5.889[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | A3 IV[5] |
| U−B color index | +0.09[6] |
| B−V color index | +0.18[6] |
| Astrometry | |
| Radial velocity (Rv) | −29.9±2.0[7] km/s |
| Proper motion (μ) | RA: +53.593[2] mas/yr Dec.: −0.223[2] mas/yr |
| Parallax (π) | 18.884 ± 0.0408[2] mas |
| Distance | 172.7 ± 0.4 ly (53.0 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.24[1] |
| Details | |
| Mass | 1.68[8] M☉ |
| Luminosity | 10.5[1] L☉ |
| Surface gravity (log g) | 4.21[3] cgs |
| Temperature | 7,906[3] K |
| Metallicity [Fe/H] | −0.05[3] dex |
| Rotational velocity (v sin i) | 22.5[8] km/s |
| Age | 361±308[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from υ Aquilae, and abbreviated Upsilon Aql or υ Aql. With an apparent visual magnitude of +5.91[6] it is a faint star but, according to the Bortle Dark-Sky Scale, it is visible to the naked eye from suburban skies. It has an annual parallax shift of 18.9 mas,[10] indicating a distance of 173 light-years (53 parsecs). The star is drifting closer with a radial velocity of −30 km/s.[7]
This is a subgiant star with a stellar classification of A3 IV.[5] The outer atmosphere is radiating energy into space with 10.5[1] times the Sun's luminosity from its photosphere at an effective temperature of 7,906 K,[3] which gives it the white-hot glow of an A-type star. It is 361 million years old with 1.68 times the mass of the Sun and has a relatively high rate of spin with a projected rotational velocity of 22.5 km/s. An infrared excess has been reported, although no circumstellar disk has been resolved.[8]
References
- ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S.
- ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
- ↑ 5.0 5.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 6.0 6.1 6.2 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.
- ↑ 7.0 7.1 Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities", Washington (Carnegie Institution of Washington): 0, Bibcode: 1953GCRV..C......0W.
- ↑ 8.0 8.1 8.2 8.3 Grandjean, A. et al. (June 2021), "A SOPHIE RV search for giant planets around young nearby stars (YNS). A combination with the HARPS YNS survey", Astronomy & Astrophysics 650: id. A39, doi:10.1051/0004-6361/202039672, Bibcode: 2021A&A...650A..39G.
- ↑ "* ups Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+ups+Aql.
- ↑ 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.
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