IQ Aurigae

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IQ Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 19m 00.02928s[1]
Declination +33° 44′ 54.2159″[1]
Apparent magnitude (V) 5.35[2]
Spectral type A0pSi[3]
U−B color index −0.62[2]
B−V color index −0.19[2]
Variable type α² CVn
Radial velocity (Rv)+28.6[4] km/s
Proper motion (μ) RA: +14.17[1] mas/yr
Dec.: -29.75[1] mas/yr
Parallax (π)7.89 ± 0.37[1] mas
Distance410 ± 20 ly
(127 ± 6 pc)
Absolute magnitude (MV)–0.42[5]
Mass3.95 ± 0.21[5] M
Radius2.6 ± 0.4[5] R
Luminosity263[5] L
Surface gravity (log g)4.34 ± 0.12[5] cgs
Temperature14,454[5] K
Metallicity [Fe/H]1.70[6] dex
Rotation2.4660 days[5]
Rotational velocity (v sin i)49[7] km/s
Other designations
BD+33° 1008, HD 34452, HIP 24799, HR 1732, SAO 57884.
Database references

IQ Aurigae is a variable star in the northern constellation of Auriga. The spectrum displays the characteristics of a peculiar star; in this instance a strong line of singly ionized silicon. For this reason it is known as a silicon star, it may also be helium deficient as the lines of helium are weaker than expected.[6]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357Vizier catalog entry
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
  3. ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  4. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. ^ a b c d e f g North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N
  6. ^ a b Tomley, L. J.; Wallerstein, G.; Wolff, S. C. (December 1970), "A spectroscopic analysis of the silicon star HD 34452.", Astronomy and Astrophysics, 9: 380–391, Bibcode:1970A&A.....9..380T
  7. ^ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943

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