Astronomy:Upsilon Boötis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 49m 28.641s[1] |
| Declination | +15° 47′ 52.46″[1] |
| Apparent magnitude (V) | 4.023[2] |
| Characteristics | |
| Spectral type | K5.5 III[3] |
| U−B color index | +1.893[2] |
| B−V color index | +1.518[2] |
| Astrometry | |
| Radial velocity (Rv) | −5.94±0.26[4] km/s |
| Proper motion (μ) | RA: −93.269[1] mas/yr Dec.: +40.166[1] mas/yr |
| Parallax (π) | 13.4228 ± 0.1380[1] mas |
| Distance | 243 ± 2 ly (74.5 ± 0.8 pc) |
| Absolute bolometric magnitude (Mbol) | −1.44±0.14[5] |
| Details | |
| Mass | 1.11±0.33[6] M☉ |
| Radius | 40.72+0.77 −0.79[7] R☉ |
| Luminosity | 332±54[6] L☉ |
| Surface gravity (log g) | 1.5[4] cgs |
| Temperature | 3,920[6] K |
| Metallicity [Fe/H] | −0.23[4] dex |
| Rotational velocity (v sin i) | 5.1[4] km/s |
| Age | 10.08±1.41[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Boötis is a single,[9] orange-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from υ Boötis, and abbreviated Upsilon Boo or υ Boo. This is a fourth[2] magnitude star that is visible to the naked eye. Based upon an annual parallax shift of 12.38 mas as seen from the Earth,[1] it is located about 243 light-years (75 pc) distant. The star is moving closer to the Sun with a radial velocity of −6 km/s.[4]
This is an evolved K-type giant star with a stellar classification of K5.5 III.[3] Astroseismology was used to obtain a mass estimate of 1.11 times the mass of the Sun,[6] while interferometric measurements give a size of about 38[5] times the Sun's radius. It is radiating about 332[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,920 K.[6] The star is roughly 10[7] billion years old and is spinning with a projected rotational velocity of 5.1 km/s.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 2.2 2.3 Gutierrez-Moreno, Adelina et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17, Bibcode: 1966PDAUC...1....1G.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ 5.0 5.1 Piau, L. et al. (2010), "Surface convection and red giants radii measurements", Astronomy and Astrophysics 526: 12, doi:10.1051/0004-6361/201014442, A100, Bibcode: 2011A&A...526A.100P.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 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, doi:10.1086/528936, Bibcode: 2008ApJ...674L..53S.
- ↑ 7.0 7.1 7.2 Baines, Ellyn K. et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B.
- ↑ "ups Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Boo.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
External links
- Hoffleit (1991), "HR 5200", Bright Star Catalogue, http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205200, retrieved 2017-09-11.
- "ups Boo", Aladin previewer (Centre de Données astronomiques de Strasbourg), http://aladin.u-strasbg.fr/AladinPreview?-c=13+49+28.6411%2B15+47+52.458&ident=SV*+ZI++1027&submit=Aladin+previewer, retrieved 2017-09-11.
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