16 Aurigae Triple star system in the constellation Auriga
16 Aurigae
Location of 16 Aurigae (circled in red)
Observation dataEpoch J2000 Equinox J2000
Constellation Auriga [ 1]
Right ascension 05h 18m 10.576s [ 2]
Declination +33° 22′ 17.77″ [ 2]
Apparent magnitude (V)4.552[ 3]
Characteristics
Evolutionary stage red giant branch [ 2]
Spectral type K2.5 IIIb CN-0.5 [ 4]
U−B color index
+1.26[ 5]
B−V color index
+1.276[ 3]
Astrometry Radial velocity (Rv )−28.44[ 3] km/s Proper motion (μ) RA: ± 0.713[ 2] mas /yr Dec.: ± 0.504[ 2] mas /yr Parallax (π)9.5090± 0.5651 mas [ 2] Distance 340 ± 20 ly pc ) Absolute magnitude (MV )0.28[ 1] Orbit [ 6] [ 7] Period (P)± 0.03 dSemi-major axis (a)± 1.59 mas Eccentricity (e)± 0.0026Inclination (i)± 9.46° Longitude of the node (Ω)± 11.65° Periastron epoch (T)± 17.1872 JD Argument of periastron (ω)± 1.2° Details 16 Aur A Mass 1.30[ 3] M ☉ Radius ± 0.89[ 8] R ☉ Luminosity ± 11[ 8] L ☉ Surface gravity (log g )1.87[ 9] cgs Temperature ± 58[ 3] K Metallicity [Fe/H] −0.40[ 9] dex Rotational velocity (v sin i )0.0[ 10] km/s Age 5.07[ 3] Gyr Other designations 16 Aur , NSV 1909BD +33°1000HD 34334HIP 24727HR 1726SAO 57853PPM 70153ADS 3872WDS J05182+3322[ 11] Database references SIMBAD data
16 Aurigae is a triple star [ 12] light years away from the Sun in the northern constellation of Auriga .[ 2] 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.[ 3]
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 ;[ 4] III. The notation of the former class indicates weak lines of CN in the spectrum .[ 6] [ 3] [ 3] 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.[ 3]
A third component is a 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
1 2 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 . XHIP record for this object at VizieR .1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A& A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .1 2 3 4 5 6 7 8 9 10 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 . 1 2 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 . 1 2 3 4 5 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 . 1 2 3 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 . 1 2 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 .1 2 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 .
