Triple star system in the constellation Auriga
16 Aurigae is a triple star [ 12] 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,[ 13] Capella toward Beta Tauri . It also lies in the midst of the Melotte 31 cluster, but is merely a line-of-sight interloper.[ 6] proper motion , advancing across the celestial sphere at the rate of 0.166 arc seconds per annum,[ 14] radial velocity of −28 km/s.[ 2]
The primary component is a single-lined spectroscopic binary with an orbital period of 1.19 years and an eccentricity of 0.1189.[ 6] K-type giant star with a stellar classification of K2.5 IIIb CN-0.5 ;[ 3] lines of CN in the spectrum .[ 6] [ 2] [ 2] 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[ 8] luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,264 K.[ 2]
A third component is an magnitude 10.6 star at an angular separation of ″ [ 12] common proper motion with the primary and thus is a likely third member of the system.[ 6]
References
^ a b c d e 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 . ^ a b c d e f g h i j Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal . 150 (3): 88. arXiv :1507.01466 Bibcode :2015AJ....150...88L . doi :10.1088/0004-6256/150/3/88 . S2CID 118505114 . ^ a b Keenan, P.; McNeil, R. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series . 71 : 245– 266. Bibcode :1989ApJS...71..245K . doi :10.1086/191373 . ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data . Bibcode :1986EgUBV........0M . ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . S2CID 119257644 . ^ a b c d e Griffin, R. F. (2008). "Spectroscopic binary orbits from photoelectric radial velocities - Paper 198: 48 Piscium, 16 Aurigae, 5 Herculis, and Beta Scuti". The Observatory . 128 : 21– 56. Bibcode :2008Obs...128...21G . ^ Hartkopf, W. I.; et al. (June 30, 2006). "Sixth Catalog of Orbits of Visual Binary Stars" . United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-06-02 . ^ a b c 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" . The Astrophysical Journal . 922 (2): 163. arXiv :2107.09205 Bibcode :2021ApJ...922..163V . doi :10.3847/1538-4357/ac1687 ISSN 0004-637X . ^ a b Matrozis, E.; et al. (November 2013). "Galactic chemical evolution of sulphur. Sulphur abundances from the [S i] λ1082 nm line in giants". Astronomy & Astrophysics . 559 : 13. arXiv :1309.0114 Bibcode :2013A&A...559A.115M . doi :10.1051/0004-6361/201322317 . S2CID 118421435 . A115. ^ Massarotti, Alessandro; et al. (2008). "The 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 ^ "16 Aur" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-05-21 .^ a b 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 . ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27 – L30 . Bibcode :2000A&A...355L..27H . ^ 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. arXiv :astro-ph/0412070 Bibcode :2005AJ....129.1483L . doi :10.1086/427854 . S2CID 2603568 .
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