Iota Arietis
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 Location of ι Arietis (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 57m 21.05476s[1] |
| Declination | +17° 49′ 03.1202″[1] |
| Apparent magnitude (V) | 5.117[2] |
| Characteristics | |
| Spectral type | K1 Vp[3] |
| U−B color index | +0.700[2] |
| B−V color index | +0.921[2] |
| Astrometry | |
| Radial velocity (Rv) | –4.9[4] km/s |
| Proper motion (μ) | RA: +34.76[1] mas/yr Dec.: –22.95[1] mas/yr |
| Parallax (π) | 6.27 ± 0.33[1] mas |
| Distance | 520 ± 30 ly (159 ± 8 pc) |
| Absolute magnitude (MV) | –0.4[5] |
| Details | |
| Surface gravity (log g) | 2.42[5] cgs |
| Temperature | 4,235[5] K |
| Metallicity [Fe/H] | –0.37[5] dex |
| Other designations | |
Iota Arietis (ι Ari, ι Arietis) is the Bayer designation for a binary star system in the northern constellation of Aries. It has an apparent visual magnitude of 5.117;[2] bright enough to be dimly seen with the naked eye. Parallax measurements made during the Hipparcos mission yield an estimated distance of 520 light-years (160 parsecs) from Earth.[1]
This is a spectroscopic binary system with an orbital period of 1,568 days (4.3 years) and an eccentricity of 0.36. The primary is a K-type main sequence star with a stellar classification of K1 Vp. (The 'p' indicates some type of peculiarity with the spectrum.) The companion is a suspected white dwarf.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ↑ 2.0 2.1 2.2 2.3 Jennens, 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: 667–679, Bibcode:1975MNRAS.172..667J.
- ↑ 3.0 3.1 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:[http://adsabs.harvard.edu/abs/1953QB901.W495..... 1953QB901.W495.....].
- ↑ 5.0 5.1 5.2 5.3 Helfer, H. L.; Wallerstein, George (August 1968), "Abundances in K-Giant Stars. II. a Survey of Field Stars", Astrophysical Journal Supplement 16: 1, Bibcode:1968ApJS...16....1H, doi:10.1086/190169.
- ↑ "iot Ari -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-04.
External links
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