Psi7 Aurigae

Psi7 Aurigae, Latinized from ψ7 Aurigae, is a star in the northern constellation of Auriga. It is a dim, naked eye star with an apparent visual magnitude of 5.02. Based upon Gaia Data Release 2 parallax values, it is approximately 330 light-years (100 parsecs) from Earth.

For other star systems with this Bayer designation, see Psi Aurigae.
Psi7 Aurigae
Location of ψ7 Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  06h 50m 45.94330s[1]
Declination +41° 46′ 52.4267″[1]
Apparent magnitude (V) 5.02[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.35[2]
B−V color index +1.27[2]
R−I color index 0.46
Astrometry
Radial velocity (Rv)+59.53 ± 0.25[4] km/s
Proper motion (μ) RA: –25.660[5] mas/yr
Dec.: –138.163[5] mas/yr
Parallax (π)9.8872 ± 0.1499[5] mas
Distance330 ± 5 ly
(101 ± 2 pc)
Absolute magnitude (MV)−0.33[6]
Details
Radius24[7] R☉
Luminosity217[6] L☉
Surface gravity (log g)2.35[8] cgs
Temperature4,300[8] K
Metallicity [Fe/H]0.00[8] dex
Rotational velocity (v sin i)10[9] km/s
Other designations
ψ7 Aur, 58 Aurigae, BD+41 1536, FK5 2527, HD 49520, HIP 32844, HR 2516, SAO 41380.[10]
Database references
SIMBADdata
ψ7 Aurigae in optical light

ψ7 Aurigae is a giant star with a stellar classification of K3 III.[3] The measured angular diameter of this star, after correction for limb darkening, is 1.96 ± 0.04 mas.[11] At its estimated distance,[1] this yields a physical size of about 24 times the radius of the Sun.[7] The outer envelope has an effective temperature of 4,300,[8] giving it an orange colour and a classification as a K-type star.[12] Although cooler than the sun, its larger size means that it is more luminous, emitting in total 217 times as much electromagnetic radiation.

References
  1. 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. Note: see VizieR catalogue I/311.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J
  3. Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
  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.
  5. Brown, 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 at VizieR.
  6. 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.
  7. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  8. McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
  9. Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
  10. "* 58 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-24.
  11. Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  12. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16.
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