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Phi Aurigae

From Wikipedia, the free encyclopedia
Star in the constellation Auriga
φ Aurigae
Location of φ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationAuriga
Right ascension05h 27m 38.88417s[1]
Declination+34° 28′ 33.1639″[1]
Apparent magnitude (V)5.089[2]
Characteristics
Spectral typeK3 IIIp[3]
U−Bcolor index+1.649[2]
B−Vcolor index+1.411[2]
R−Icolor index0.47
Astrometry
Radial velocity (Rv)+30.78[4] km/s
Proper motion (μ)RA: –1.324[1]mas/yr
Dec.: –38.746[1]mas/yr
Parallax (π)6.7629±0.1659 mas[1]
Distance480 ± 10 ly
(148 ± 4 pc)
Absolute magnitude (MV)−0.62[5]
Details
Radius33.97±1.05[6] R
Luminosity307±15[6] L
Surface gravity (log g)1.75[3] cgs
Temperature4,222[6] K
Metallicity [Fe/H]–0.03[3] dex
Rotational velocity (v sin i)1.6[7] km/s
Other designations
φ Aur,24 Aurigae,BD+34 1048,HD 35620,HIP 25541,HR 1805,SAO 58051.[8]
Database references
SIMBADdata
φ Aurigae in optical light

Phi Aurigae,Latinized from φ Aurigae, is agiant star in the northernconstellation ofAuriga. It is faintly visible to the naked eye with anapparent visual magnitude of 5.089.[2] It lies10 from another faint naked-eye starHD 35520, between the threeopen clustersM36 andM38, andNGC 1893.

The distance to this star, as determined fromparallax measurements, is approximately 480light-years (150parsecs) with a 10 light-yearmargin of error.[9] This is anevolved giant star with astellar classification of K3 IIIp[3] and an estimated radius equal to 34 times the radius of the Sun. Theouter envelope has aneffective temperature of 4,222 K,[6] giving it the cool orange-hued glow of aK-type star.

References

[edit]
  1. ^abcdeBrown, A. G. A.; et al. (Gaia collaboration) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties".Astronomy & Astrophysics.616. A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source atVizieR.
  2. ^abcdJennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.",Monthly Notices of the Royal Astronomical Society,172 (3):667–679,Bibcode:1975MNRAS.172..667J,doi:10.1093/mnras/172.3.667.
  3. ^abcdCenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters",Monthly Notices of the Royal Astronomical Society,374 (2):664–690,arXiv:astro-ph/0611618,Bibcode:2007MNRAS.374..664C,doi:10.1111/j.1365-2966.2006.11196.x,S2CID 119428437.
  4. ^Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters",Astronomy and Astrophysics,430 (1):165–186,arXiv:astro-ph/0409579,Bibcode:2005A&A...430..165F,doi:10.1051/0004-6361:20041272,S2CID 17804304.
  5. ^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,S2CID 119257644.
  6. ^abcdvan 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.Phi Aurigae's database entry atVizieR.
  7. ^De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars",Astronomy and Astrophysics,363:239–243,arXiv:astro-ph/0010273,Bibcode:2000A&A...363..239D.
  8. ^"* phi Aur".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2012-08-23.
  9. ^van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474 (2):653–664,arXiv:0708.1752v1,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID 18759600.Note: see VizieR catalogueI/311.

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