15 Boötis

Binary star in the northern constellation of Boötes J2000 Boötes 14 14 50.85024 +10 06 02.1964 5.45 (5.51 + 8.53) red clump K1 III 1.007 0.003 +16.80 0.40 −20.83 −164.41 12.31 0.59 0.75 1.48 0.42 10 61.08 4845 92 commas −0.26 2.55 0.11 0.0 2.0 0.8 0.6 15 Boo +10°2654 3131 124679 69612 5330 100934 19226 14148+1006 J14148+1006 15+Boo 15 Boötis is a binary star system in the northern constellation of Boötes, located approximately 260 light years away from the Sun. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45. The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum. It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s. The magnitude 5.51 primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III. It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two billion years old with 1.5 times the mass of the Sun and has expanded to 10 times the Sun's radius. The star is radiating 61 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K. Its companion, component B, is a magnitude +8.53 star was located at an angular separation of 0.80 arcsecond 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. References 15 Boo May 7, 2019 . Validation of the new Hipparcos reduction van Leeuwen F. Astronomy and Astrophysics 474 2 653–664 2007 0708.1752 2007A&A...474..653V 10.1051/0004-6361:20078357 18759600 XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters . 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 September 2008 10.1111/j.1365-2966.2008.13596.x free . 2008MNRAS.389..869E 0806.2878 14878976 Harlan E. A. Taylor D. C. MK classification for F- and G-type stars. II Astronomical Journal . 75 2 165–166 March 1970 1970AJ.....75..165H 10.1086/110956 free 1 Feuillet Diane K. Bovy Jo Holtzman Jon Girardi Léo MacDonald Nick Majewski Steven R. Nidever David L. Determining Ages of APOGEE Giants with Known Distances The Astrophysical Journal . 817 1 40 2016 2016ApJ...817...40F 1511.04088 10.3847/0004-637x/817/1/40 118675933 free Massarotti Alessandro Latham David W. Stefanik Robert P. Fogel Jeffrey Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity 1 The Astronomical Journal 135 1 209–231 January 2008 10.1088/0004-6256/135/1/209 2008AJ....135..209M 121883397 free Lépine Sébastien Shara Michael M. A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog) The Astronomical Journal 129 3 1483–1522 March 2005 10.1086/427854 2005AJ....129.1483L astro-ph/0412070 2603568 . Alves David R. K-Band Calibration of the Red Clump Luminosity The Astrophysical Journal 539 2 732–741 August 2000 10.1086/309278 2000ApJ...539..732A astro-ph/0003329 16673121 . . 1 Mason B. D. Wycoff G. L. Hartkopf W. I. Douglass G. G. Worley C. E. The Washington Visual Double Star Catalog The Astronomical Journal 2014 122 6 3466 2001AJ....122.3466M http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds 2015-07-22 10.1086/323920 free Category:Horizontal-branch stars Category:Binary stars Category:Boötes Category:Durchmusterung objects Bootis, 15 124679 069612 5330 Category:K1III stars