Location of υ Boötis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13 49 28.64078 |
| Declination | +15° 47′ 52.4603″ |
| Apparent magnitude (V) | 4.023 |
| Characteristics | |
| Spectral type | K5.5 III |
| U−B color index | +1.893 |
| B−V color index | +1.518 |
| Astrometry | |
| Radial velocity (Rv) | −5.94±0.26 km/s |
| Proper motion (μ) | RA: −94.22±0.19 mas/yr Dec.: +41.07±0.14 mas/yr |
| Parallax (π) | 12.38 ± 0.23 mas |
| Distance | 263 ± 5 ly (81 ± 2 pc) |
| Absolute bolometric magnitude (Mbol) | −1.44±0.14 |
| Details | |
| Mass | 1.11±0.33 M☉ |
| Radius | 40.72+0.77 −0.79 R☉ |
| Luminosity | 332±54 L☉ |
| Surface gravity (log g) | 1.5 cgs |
| Temperature | 3,920 K |
| Metallicity | −0.23 dex |
| Rotational velocity (v sin i) | 5.1 km/s |
| Age | 10.08±1.41 Gyr |
| Other designations | |
| υ Boo, 5 Boötis, BD+16° 2564, HD 120477, HIP 67459, HR 5200, SAO 100725 | |
| Database references | |
| SIMBAD | data |
Upsilon Boötis (υ Boötis) is a single, orange-hued star in the northern constellation of Boötes. It is a fourth magnitude star that is visible to the naked eye. Based upon an annual parallax shift of 12.38 mas as seen from the Earth, it is located about 263 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −6 km/s.
This is an evolved K-type giant star with a stellar classification of K5.5 III. Astroseismology was used to obtain a mass estimate of 1.11 times the mass of the Sun, while interferometric measurements give a size of about 38 times the Sun's radius. It is radiating about 332 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,920 K.
References
- ^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ 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.
- ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
- ^ Piau, L.; et al. (2010), "Surface convection and red giants radii measurements", Astronomy and Astrophysics, 526: 12, arXiv:1010.3649, Bibcode:2011A&A...526A.100P, doi:10.1051/0004-6361/201014442, S2CID 118533297, A100.
- ^ Stello, D.; et al. (2008), "Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses", The Astrophysical Journal Letters, 674 (1): L53 – L56, arXiv:0801.2155, Bibcode:2008ApJ...674L..53S, doi:10.1086/528936, S2CID 15094067.
- ^ Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
- "ups Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
- 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.
External links
- Hoffleit; et al. (1991), "HR 5200", Bright Star Catalogue (5th Revised ed.), retrieved 2017-09-11.
- "ups Boo", Aladin previewer, Centre de Données astronomiques de Strasbourg, retrieved 2017-09-11.
