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] |
| Characteristics | |
| Spectral type | A0pSi[3] |
| U−B color index | −0.62[2] |
| B−V color index | −0.19[2] |
| Variable type | α² CVn |
| Astrometry | |
| 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 |
| Distance | 410 ± 20 ly (127 ± 6 pc) |
| Absolute magnitude (MV) | –0.42[5] |
| Details | |
| Mass | 3.95 ± 0.21[5] M☉ |
| Radius | 2.6 ± 0.4[5] R☉ |
| Luminosity | 263[5] L☉ |
| Surface gravity (log g) | 4.34 ± 0.12[5] cgs |
| Temperature | 14,454[5] K |
| Metallicity [Fe/H] | 1.70[6] dex |
| Rotation | 2.4660 days[5] |
| Rotational velocity (v sin i) | 49[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
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]
References
- 1 2 3 4 5 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
- 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
- ↑ 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
- ↑ 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. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 3 4 5 6 7 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
- 1 2 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
- ↑ 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
External links
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
This article is issued from Wikipedia - version of the Thursday, April 21, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.