Astronomy:16 Aurigae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 18m 10.570s[1] |
| Declination | +33° 22′ 17.81″[1] |
| Apparent magnitude (V) | 4.552[2] |
| Characteristics | |
| Spectral type | K2.5 IIIb CN-0.5[3] |
| U−B color index | +1.26[4] |
| B−V color index | +1.276[2] |
| Astrometry | |
| Radial velocity (Rv) | −28.44[2] km/s |
| Proper motion (μ) | RA: +31.63±0.53[1] mas/yr Dec.: −160.73±0.25[1] mas/yr |
| Parallax (π) | 14.04 ± 0.58[1] mas |
| Distance | 232 ± 10 ly (71 ± 3 pc) |
| Absolute magnitude (MV) | 0.28[5] |
| Orbit[6][7] | |
| Period (P) | 434.16±0.03 d |
| Semi-major axis (a) | 7.24±1.59 mas |
| Eccentricity (e) | 0.1189±0.0026 |
| Inclination (i) | 52.93±9.46° |
| Longitude of the node (Ω) | 56.20±11.65° |
| Periastron epoch (T) | 2,448,348.1172±17.1872 JD |
| Argument of periastron (ω) (secondary) | 70.1±1.2° |
| Details | |
| 16 Aur A | |
| Mass | 1.30[2] M☉ |
| Radius | 18.8[8] R☉ |
| Luminosity | 112[8] L☉ |
| Surface gravity (log g) | 1.87[9] cgs |
| Temperature | 4,264±58[2] K |
| Metallicity [Fe/H] | −0.40[9] dex |
| Rotational velocity (v sin i) | 0.0[8] km/s |
| Age | 5.07[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
16 Aurigae is a triple star[11] system located 232 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,[12] 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.[6] The system has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.166 arc seconds per annum,[13] and is moving closer to the Earth with a heliocentric 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] The visible member is an aging K-type giant star with a stellar classification of K2.5 IIIb CN-0.5;[3] sometimes just given as K3 III. The notation of the former class indicates weak lines of CN in the spectrum.[6] This star is an estimated five[2] billion years old with 1.30[2] times the mass of the Sun. As a consequence of exhausting the hydrogen at its core, it has expanded to 18.8[8] times the Sun's radius. The star is radiating 112[8] times the 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 4.2″.[11] It shows a common proper motion with the primary and thus is a likely third member of the system.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 2.5 2.6 2.7 2.8 2.9 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L.
- ↑ 3.0 3.1 Keenan, P.; McNeil, R. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245–266. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 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. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 6.4 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.; Mason, B. D.; Worley, C. E. (June 30, 2006). "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6. Retrieved 2017-06-02.
- ↑ 8.0 8.1 8.2 8.3 8.4 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. doi:10.1088/0004-6256/135/1/209. Bibcode: 2008AJ....135..209M.
- ↑ 9.0 9.1 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. doi:10.1051/0004-6361/201322317. A115. Bibcode: 2013A&A...559A.115M.
- ↑ "16 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=16+Aur.
- ↑ 11.0 11.1 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.
- ↑ Høg, E. (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. doi:10.1086/427854. Bibcode: 2005AJ....129.1483L.
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