Astronomy:15 Boötis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 14m 50.85024s[1] |
| Declination | +10° 06′ 02.1964″[1] |
| Apparent magnitude (V) | 5.45 (5.51 + 8.53)[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| B−V color index | 1.007±0.003[4] |
| Astrometry | |
| Radial velocity (Rv) | +16.80±0.40[4] km/s |
| Proper motion (μ) | RA: −20.83[1] mas/yr Dec.: −164.41[1] mas/yr |
| Parallax (π) | 12.31 ± 0.59[1] mas |
| Distance | 260 ± 10 ly (81 ± 4 pc) |
| Absolute magnitude (MV) | 0.75[4] |
| Details | |
| Mass | 1.48±0.42[5] M☉ |
| Radius | 10[6] R☉ |
| Luminosity | 61.08[4] L☉ |
| Surface gravity (log g) | 2.55±0.11[5] cgs |
| Temperature | 4,845±92[5] K |
| Metallicity [Fe/H] | −0.26[7] dex |
| Rotational velocity (v sin i) | 0.0[6] km/s |
| Age | 2.0+0.8 −0.6[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Boötis is a binary star[2] system in the northern constellation of Boötes,[8] located approximately 260 light years away from the Sun.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45.[2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum.[9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s.[4]
The magnitude 5.51[2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III.[3] It is a red clump giant,[7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two[5] billion years old with 1.5[5] times the mass of the Sun and has expanded to 10[6] times the Sun's radius. The star is radiating 61[4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K.[5]
Its companion, component B, is a magnitude +8.53 star[2] was located at an angular separation of 0.80″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal 75 (2): 165–166, doi:10.1086/110956, Bibcode: 1970AJ.....75..165H.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Feuillet, Diane K. et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal 817 (1): 40, doi:10.3847/0004-637x/817/1/40, Bibcode: 2016ApJ...817...40F.
- ↑ 6.0 6.1 6.2 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
- ↑ 7.0 7.1 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A.
- ↑ 8.0 8.1 "15 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=15+Boo.
- ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483–1522, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M, http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds, retrieved 2015-07-22.
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