16 Aurigae

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Template:Short description

16 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.552[2]
Characteristics
Spectral type K2.5 IIIb CN-0.5[3]
U−B Template:Engvar +1.26[4]
B−V Template:Engvar +1.276[2]
Astrometry
Radial velocity (Rv)−28.44[2] km/s
Proper motion (μ) RA: Template:Val[1] mas/yr
Dec.: Template:Val[1] mas/yr
Parallax (π)14.04±0.58 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.28[5]
Orbit[6][7]
Period (P)Template:Val
Semi-major axis (a)Template:Val
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Details
16 Aur A
Mass1.30[2] Template:Solar mass
RadiusTemplate:Val[8] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
Surface gravity (log g)1.87[9] cgs
TemperatureTemplate:Val[2] K
Metallicity [Fe/H]−0.40[9] dex
Rotational velocity (v sin i)0.0[10] km/s
Age5.07[2] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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16 Aurigae is a triple star[12] 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,[13] 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,[14] 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 Template:Convert 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 20 times the Sun's radius. The star is radiating 127[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 Template:Val.[12] It shows a common proper motion with the primary and thus is a likely third member of the system.[6]

References

Template:Reflist

External links

Template:Stars of Auriga

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named luck2015
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Keenan1989
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named EgUBV
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  6. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Griffin2008
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named ORB6
  8. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named van Belle
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Matrozis2013
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Massarotti2008
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named TYC2
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Lepine2005
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