16 Aurigae

{{short description|Triple star system in the constellation Auriga}}

{{Starbox observe

| epoch = J2000

| constell = Auriga

| ra = {{RA|05|18|10.570}}

| dec = {{DEC|+33|22|17.81}}

| appmag_v = 4.552

}}

{{Starbox character

| class = {{nowrap|K2.5 IIIb CN-0.5}}

| b-v = +1.276

| u-b = +1.26

| variable =

}}

{{Starbox astrometry

| radial_v = −28.44

| prop_mo_ra = {{Val|+31.63|0.53}}

| prop_mo_dec = {{Val|−160.73|0.25}}

| parallax = 14.04

| p_error = 0.58

| parallax_footnote =

| absmag_v = 0.28

}}

{{Starbox orbit

| reference =

| period_unitless = {{Val|434.16|0.03|u=days}}

| axis_unitless = {{Val|7.24|1.59|ul=mas}}

| eccentricity = {{Val|0.1189|0.0026}}

| inclination = {{Val|52.93|9.46}}

| node = {{Val|56.20|11.65}}

| periarg = {{Val|70.1|1.2}}

| periastron = {{Val|2448348.1172|17.1872|ul=JD|fmt=commas}}

}}

{{Starbox detail

| source =

| component1 = 16 Aur A

| mass = 1.30

| radius = {{val|19.86|0.89}}

| luminosity = {{val|127|11}}

| temperature = {{Val|4264|58|fmt=commas}}

| metal_fe = −0.40

| gravity = 1.87

| rotational_velocity = 0.0

| age_gyr = 5.07

}}

{{Starbox catalog

| names = {{odlist | F=16 Aur | SAO=57853 | ADS=3872 | HD=34334 | HIP=24727 | PPM=70153 | BD=+33°1000 | HR=1726 | NSV=1909 | WDS=J05182+3322 }}

}}

{{Starbox reference

| Simbad = 16+Aur

}}

16 Aurigae is a triple star 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, 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 {{Convert|434.16|days|years|2|abbr=off|disp=out}} and an eccentricity of 0.1189. The visible member is an aging K-type giant star with a stellar classification of {{nowrap|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 an magnitude 10.6 star at an angular separation of {{Val|4.2|ul=arcsecond}}. It shows a common proper motion with the primary and thus is a likely third member of the system.

References

{{Reflist|refs=

{{cite journal

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{cite journal

| title=The Tycho-2 catalogue of the 2.5 million brightest stars

| author1=Høg, E. | display-authors=etal

| journal=Astronomy and Astrophysics

| volume=355 | pages=L27–L30 | date=2000

| bibcode=2000A&A...355L..27H }}
4.8 / 10.6

{{cite journal

| title=Spectroscopic binary orbits from photoelectric radial velocities - Paper 198: 48 Piscium, 16 Aurigae, 5 Herculis, and Beta Scuti

| last1=Griffin | first1=R. F.

| journal=The Observatory

| volume=128 | pages=21–56 | year=2008

| bibcode=2008Obs...128...21G }}

{{Cite journal |last1=van Belle |first1=Gerard T. |last2=von Braun |first2=Kaspar |last3=Ciardi |first3=David R. |last4=Pilyavsky |first4=Genady |last5=Buckingham |first5=Ryan S. |last6=Boden |first6=Andrew F. |last7=Clark |first7=Catherine A. |last8=Hartman |first8=Zachary |last9=van Belle |first9=Gerald |last10=Bucknew |first10=William |last11=Cole |first11=Gary |date=2021-12-01 |title=Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color |bibcode=2021ApJ...922..163V |journal=The Astrophysical Journal |volume=922 |issue=2 |pages=163 |doi=10.3847/1538-4357/ac1687 |doi-access=free |arxiv=2107.09205 |issn=0004-637X}}

{{cite journal

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen |first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | year=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}

{{cite journal

| last1=Mermilliod | first1=J.-C.

| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)

| journal=Catalogue of Eggen's UBV Data

| date=1986 | bibcode=1986EgUBV........0M }}

{{cite web | display-authors=1 | last1=Hartkopf | first1=W. I. | last2=Mason | first2=B. D. | last3=Worley | first3=C. E. | title=Sixth Catalog of Orbits of Visual Binary Stars | publisher=United States Naval Observatory | date=June 30, 2006 | url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 | accessdate=2017-06-02 | archive-date=2017-08-01 | archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 | url-status=dead }}

{{cite journal

| last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W.

| last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey

| title=The Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity

| display-authors=1 | journal=The Astronomical Journal

| volume=135 | issue=1 | pages=209–231 | year=2008

| bibcode = 2008AJ....135..209M

| doi=10.1088/0004-6256/135/1/209 | doi-access=free }}

{{cite journal

| first1=P. | last1=Keenan | first2=R. | last2=McNeil

| title=The Perkins catalog of revised MK types for the cooler stars

| journal=Astrophysical Journal Supplement Series

| volume=71 | pages=245–266 | date=October 1989

| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}

{{cite journal

| title=Galactic chemical evolution of sulphur. Sulphur abundances from the [S i] λ1082 nm line in giants

| display-authors=1 | last1=Matrozis | first1=E.

| last2=Ryde | first2=N. | last3=Dupree | first3=A. K.

| journal=Astronomy & Astrophysics

| volume=559 | id=A115 | pages=13 | date=November 2013

| doi=10.1051/0004-6361/201322317

| bibcode=2013A&A...559A.115M | arxiv=1309.0114 | s2cid=118421435 }}

{{cite journal

| title=Abundances in the Local Region. I. G and K Giants

| journal=The Astronomical Journal

| last1=Luck | first1=R. Earle

| volume=150 | issue=3 | pages=88 | year=2015

| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88

| arxiv=1507.01466 | s2cid=118505114

}}

{{cite journal

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.

| title=A catalogue of multiplicity among bright stellar systems

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869–879 | date=September 2008

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E

|arxiv = 0806.2878 | s2cid=14878976 }}

{{cite journal

| last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M.

| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)

| journal=The Astronomical Journal

| volume=129 | issue=3 | pages=1483–1522 | date=March 2005

| doi=10.1086/427854 | bibcode=2005AJ....129.1483L

| arxiv=astro-ph/0412070 | s2cid=2603568 }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%201726 HR 1726]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J05182%2b3322AB CCDM J05182+3322]
[http://aladin.u-strasbg.fr/AladinPreview?-c=05+18+10.5690%2B33+22+17.806&ident=NSV++1909&submit=Aladin+previewer Image 16 Aurigae]

Category:K-type giants

Category:Spectroscopic binaries

Category:Triple star systems

Category:Auriga

Category:Durchmusterung objects