Upsilon Coronae Borealis
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Star in the constellation Corona Borealis
Not to be confused with U Coronae Borealis.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 16h 16m 44.78710s[1] |
| Declination | +29° 09′ 00.9382″[1] |
| Apparent magnitude (V) | 5.78[2] |
| Characteristics | |
| Spectral type | A3V[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.07[2] |
| Astrometry | |
| Radial velocity (Rv) | 0.8±1.0[4] km/s |
| Proper motion (μ) | RA: +23.672[1] mas/yr Dec.: −16.546[1] mas/yr |
| Parallax (π) | 5.2987±0.0347 mas [1] |
| Distance | 616 ± 4 ly (189 ± 1 pc) |
| Absolute magnitude (MV) | −0.72[5] |
| Details | |
| Mass | 3.06±0.19[6] M☉ |
| Radius | 5.6[7] R☉ |
| Luminosity | 151[8] L☉ |
| Surface gravity (log g) | 3.8[9] cgs |
| Temperature | 8,098[8] K |
| Metallicity [Fe/H] | −0.65[9] dex |
| Rotational velocity (v sin i) | 112[3] km/s |
| Age | 407[10] Myr |
| Other designations | |
| υ CrB , 18 Coronae Borealis , NSV 7596, BD+29°2803, FK5 3287, HD 146738, HIP 79757, HR 6074, SAO 84281, WDS J16167+2909[11] | |
| Database references | |
| SIMBAD | data |
Upsilon Coronae Borealis, Latinized from υ Coronae Borealis, is a solitary[12] star in the northern constellation of Corona Borealis. It is a white-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.78.[2] The distance to this object is approximately 616 light-years (189 parsecs) based on parallax.
This is an A-type main-sequence star with a stellar classification of A3V;[3] a star that is currently fusing its core hydrogen. However, Palmer et al. (1968) had it classed as type A2IV,[13] and thus it may be near or past its main sequence lifetime.[6] It is a suspected variable star of unknown type that has been measured ranging in brightness from magnitude 5.78 down to 5.88.[14]
Upsilon Coronae Borealis has three times the mass of the Sun and about six times the Sun's radius. It is spinning with a projected rotational velocity of 112 km/s. The star is radiating 151 times the luminosity of the Sun from its photosphere at an effective temperature of 8,098 K. At an age of 407 million years, it is thought to be right at the end of its main sequence life.[6]
References
[edit ]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940 . S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d 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 c 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.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048 , Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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 and Astrophysics, 537: A120, arXiv:1201.2052 , Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023), "Variability Catalog of Stars Observed during the TESS Prime Mission", The Astrophysical Journal Supplement Series, 268 (1): 4, arXiv:2208.11721 , Bibcode:2023ApJS..268....4F, doi:10.3847/1538-4365/acdee5 .
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037 , Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x , S2CID 118665352.
- ^ a b Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024), "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost", Astronomy and Astrophysics, 691: A98, arXiv:2407.06963 , Bibcode:2024A&A...691A..98K, doi:10.1051/0004-6361/202451427.
- ^ Gontcharov, G. A. (2012), "Dependence of kinematics on the age of stars in the solar neighborhood", Astronomy Letters, 38 (12): 771, arXiv:1606.08814 , Bibcode:2012AstL...38..771G, doi:10.1134/S1063773712120031.
- ^ "ups CrB", SIMBAD , Centre de données astronomiques de Strasbourg , retrieved 2017年04月25日.
- ^ 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.
- ^ Palmer, D. R.; et al. (1968), "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars", Royal Observatory Bulletin, 135: 385, Bibcode:1968RGOB..135..385P.
- ^ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.