9 Aurigae

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Template:Short description

9 Aurigae
Template:Location mark
Location of 9 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.93 - 5.03[2]
Characteristics
Spectral type F2V[3]
U−B Template:Engvar -0.03[4]
B−V Template:Engvar +0.34[4]
Variable type γ Dor[5]
Astrometry
A
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: −28.557[6] mas/yr
Dec.: −171.822[6] mas/yr
Parallax (π)37.0551±0.1371 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
B
Proper motion (μ) RA: −54.582[7] mas/yr
Dec.: −156.009[7] mas/yr
Parallax (π)37.0796±0.0631 mas[7]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
C
Radial velocity (Rv)Template:Val[7] km/s
Proper motion (μ) RA: −32.386[8] mas/yr
Dec.: −173.026[8] mas/yr
Parallax (π)37.2115±0.0184 mas[8]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[9]
Period (P)Template:Val
Eccentricity (e)0.37
Semi-amplitude (K1)
(primary)		5.8 km/s
Details
A
Mass1.97[10] Template:Solar mass
Radius1.56[5] Template:Solar radius
Luminosity6.042[11] Template:Solar luminosity
Surface gravity (log g)4.07[5] cgs
Temperature7,023[5] K
Metallicity [Fe/H]Template:Val[5] dex
Rotational velocity (v sin i)21.0[5] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
B
Mass0.49[10] Template:Solar mass
Temperature4,947[12] K
C
Mass0.751[13] Template:Solar mass
Radius0.756[13] Template:Solar radius
Luminosity0.162[14] Template:Solar luminosity
Temperature4,633[14] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD9 Aur A
9 Aur B
9 Aur C

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9 Aurigae (9 Aur) is a star system in the constellation Auriga. It has an apparent magnitude of about 5, making it visible to the naked eye in many suburban skies.[15] Parallax estimates made by the Hipparcos spacecraft put it at about 86 light-years (26 parsecs) from the Solar System,[1] although individual Gaia Data Release 3 parallaxes place all three components at 88 light years.

File:9AurLightCurve.png
A visual band light curve for 9 Aurigae, adapted from Krisciunas et al. (1993)[16]

Kevin Krisciunas and Edward Francis Guinan discovered that the star is a variable star in 1990.[17] It is a well-studied Gamma Doradus variable,[5] and was one of the first stars to be so-classified.[18] This star type varies in luminosity due to non-radial pulsations.[18] Its apparent magnitude varies from 4.93 to 5.03 over a period of 1.25804 days.[2] For that reason it was given the variable star designation V398 Aurigae in 1995.[19][2]

9 Aurigae is a multiple star system. The naked-eye component A is a single-lined spectroscopic binary. Only the signature of an F-type main sequence star can be seen in the spectrum, but the periodic doppler shift of the absorption lines demonstrates that there is a hidden companion in a 391.7-day orbit. The gravitational interaction of the two bodies produces variations in their respective motions, which is what creates the doppler shift.[9]

Four other companions to 9 Aurigae are listed in multiple star catalogs.[20][21] The closest companion is a 12th-magnitude red dwarf Template:Val away.[5] Template:Val away is component C, a 9th-magnitude star with a spectral class of K5Ve,[22] which may also be a spectroscopic binary.[10] Further-separated still is a 14th-magnitude star, component D, proposed to be a more distant red giant,[23] although Gaia astrometry places it at a similar distance and with a similar proper motion.[24] The most widely-separated companion is component E, a distant unrelated star.[23][25]

References

Template:Reflist

Template:Stars of Auriga

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  6. ↑ a b c d Template:Cite Gaia DR3
  7. ↑ a b c d Template:Cite Gaia DR3
  8. ↑ a b c Template:Cite Gaia DR3
  9. ↑ a b Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "citation/CS1".
  11. ↑ Template:Cite DR2
  12. ↑ Template:Cite Gaia DR2
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ a b Template:Cite Gaia DR2
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Krisciunas2
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Krisciunas1990
  18. ↑ a b Script error: No such module "Citation/CS1".
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kazarovets1995
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "Citation/CS1".
  22. ↑ Script error: No such module "Citation/CS1".
  23. ↑ a b Script error: No such module "Citation/CS1".
  24. ↑ Template:Cite Gaia DR3
  25. ↑ Template:Cite DR2
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