16 Aurigae

Triple star system in the constellation Auriga Auriga constellation map.svg center 280 right Red circle.svg 10 16 Aurigae 602 630 Location of 16 Aurigae (circled in red) J2000 Auriga 05 18 10.576 +33 22 17.77 4.552 red giant branch K2.5 IIIb CN-0.5 +1.276 +1.26 −28.44 +28.505 0.713 −158.421 0.504 9.5090 0.5651 0.28 434.16 0.03 days 7.24 1.59 mas 0.1189 0.0026 52.93 9.46 56.20 11.65 70.1 1.2 2448348.1172 17.1872 JD commas 16 Aur A 1.30 19.86 0.89 127 11 4264 58 commas −0.40 1.87 0.0 5.07 16 Aur 57853 3872 34334 24727 70153 +33°1000 1726 1909 J05182+3322 16+Aur 16 Aurigae is a triple star system located 340 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.547, and is located about 2/3 of the way from Capella toward Beta Tauri. It also lies in the midst of the Melotte 31 cluster, but is merely a line-of-sight interloper. The system has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.166 arc seconds per annum, and is moving closer to the Earth with a heliocentric radial velocity of −28 km/s. The primary component is a single-lined spectroscopic binary with an orbital period of 434.16 days years 2 off out and an eccentricity of 0.1189. The visible member is an aging K-type giant star with a stellar classification of K2.5 IIIb CN-0.5; sometimes just given as K3 III. The notation of the former class indicates weak lines of CN in the spectrum. This star is an estimated five billion years old with 1.30 times the mass of the Sun. As a consequence of exhausting the hydrogen at its core, it has expanded to 20 times the Sun's radius. The star is radiating 127 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,264 K. A third component is a magnitude 10.6 star at an angular separation of 4.2 arcsecond. It shows a common proper motion with the primary and thus is a likely third member of the system. References 181124307088367232 16 Aur 2019-05-21 24727 The Tycho-2 catalogue of the 2.5 million brightest stars Høg, E. etal Astronomy and Astrophysics 355 L27–L30 2000 2000A&A...355L..27H 4.8 / 10.6 Spectroscopic binary orbits from photoelectric radial velocities - Paper 198: 48 Piscium, 16 Aurigae, 5 Herculis, and Beta Scuti Griffin R. F. The Observatory 128 21–56 2008 2008Obs...128...21G van Belle Gerard T. von Braun Kaspar Ciardi David R. Pilyavsky Genady Buckingham Ryan S. Boden Andrew F. Clark Catherine A. Hartman Zachary van Belle Gerald Bucknew William Cole Gary 2021-12-01 Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color 2021ApJ...922..163V The Astrophysical Journal 922 2 163 10.3847/1538-4357/ac1687 free 2107.09205 0004-637X Mermilliod J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished) Catalogue of Eggen's UBV Data 1986 1986EgUBV........0M 1 Hartkopf W. I. Mason B. D. Worley C. E. Sixth Catalog of Orbits of Visual Binary Stars United States Naval Observatory June 30, 2006 http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 2017-06-02 2017-08-01 https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 dead Massarotti Alessandro Latham David W. Stefanik Robert P. Fogel Jeffrey The Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity 1 The Astronomical Journal 135 1 209–231 2008 2008AJ....135..209M 10.1088/0004-6256/135/1/209 free P. Keenan R. McNeil The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 71 245–266 October 1989 1989ApJS...71..245K 10.1086/191373 Galactic chemical evolution of sulphur. Sulphur abundances from the [S i] λ1082 nm line in giants 1 Matrozis E. Ryde N. Dupree A. K. Astronomy & Astrophysics 559 A115 13 November 2013 10.1051/0004-6361/201322317 free 2013A&A...559A.115M 1309.0114 118421435 Abundances in the Local Region. I. G and K Giants The Astronomical Journal Luck R. Earle 150 3 88 2015 2015AJ....150...88L 10.1088/0004-6256/150/3/88 1507.01466 118505114 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 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 External links HR 1726 CCDM J05182+3322 Image 16 Aurigae Category:K-type giants Category:Spectroscopic binaries Category:Triple star systems Category:Auriga BD+33 1000 Aurigae, 16 034334 024727 1726