Upsilon Boötis
Location of υ Boötis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Boötes
Right ascension 13h 49m 28.64078s[1]
Declination +15° 47′ 52.4603″[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: −94.22±0.19[1] mas/yr
Dec.: +41.07±0.14[1] mas/yr
Parallax (π)12.38 ± 0.23 mas[1]
Distance263 ± 5 ly
(81 ± 2 pc)
Absolute bolometric
magnitude (Mbol)		−1.44±0.14[5]
Details
Mass1.11±0.33[6] M☉
Radius38.44±2.37[5] R☉
Luminosity332±54[6] L☉
Surface gravity (log g)1.5[4] cgs
Temperature3,920[6] K
Metallicity [Fe/H]−0.23[4] dex
Rotational velocity (v sin i)5.1[4] km/s
Other designations
υ Boo, 5 Boötis, BD+16° 2564, HD 120477, HIP 67459, HR 5200, SAO 100725[7]
Database references
SIMBADdata

Upsilon Boötis (υ Boötis) is a single,[8] orange-hued star in the northern constellation of Boötes. It 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 263 light years from the Sun. 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]

References

  1. 1 2 3 4 5 6 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.
  2. 1 2 3 4 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. 1 2 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.
  4. 1 2 3 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, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. 1 2 3 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.
  6. 1 2 3 4 5 6 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.
  7. ↑ "ups Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
  8. ↑ 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.
  • 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.
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