40 Arietis

40 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 48m 32.08886s[1]
Declination +18° 17′ 01.6489″[1]
Apparent magnitude (V) 5.82[2]
Characteristics
Spectral type K1 III[3]
U−B color index 1.13
B−V color index +1.20[2]
R−I color index 0.44
Astrometry
Radial velocity (Rv)+47.1[4] km/s
Proper motion (μ) RA: +42.00[1] mas/yr
Dec.: -32.35[1] mas/yr
Parallax (π)7.06 ± 0.47[1] mas
Distance460 ± 30 ly
(142 ± 9 pc)
Other designations
BD+17 442, HD 17459, HIP 13108, HR 828, SAO 93118.[5]

40 Arietis (abbreviated 40 Ari) is a binary star[3] system in the northern constellation of Aries. 40 Arietis is the Flamsteed designation. Their combined apparent magnitude is 5.82,[2] putting the system near the limit of naked eye visibility. Based upon an annual parallax shift of just 7.06 mas,[1] it is 460 light-years (140 parsecs) away from the Sun, give or take a 30 light-year margin of error. At that distance, its brightness is diminished by 0.21 in magnitude from extinction caused by interstellar gas and dust.[6]

This is a spectroscopic binary with an angular separation of 0.2 arcseconds between the two components.[3] Their merged spectrum matches that of an evolved giant star with a stellar classification of K1 III.[3]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
  3. 1 2 3 4 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  5. ↑ "sig Ari -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-18.
  6. ↑ 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/0409579Freely accessible, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.

External links

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