64 Arietis

64 Arietis is a possible binary star[2] system in the northern constellation of Aries. 64 Arietis is the Flamsteed designation. It is faintly visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of +5.67.[2] Based upon an annual parallax shift of 15.2 mas,[1] this star is approximately 214 light-years (66 parsecs) distant from the Sun. It is receding from the Earth with a heliocentric radial velocity of +8.5 km/s.[5]

64 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  03h 24m 18.47709s[1]
Declination +24° 43′ 26.7414″[1]
Apparent magnitude (V) +5.67[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K4 III[2]
B−V color index +1.190±0.015[4]
Astrometry
Radial velocity (Rv)+8.49±0.09[5] km/s
Proper motion (μ) RA: +13.781[1] mas/yr
Dec.: –49.347[1] mas/yr
Parallax (π)15.2059 ± 0.1237[1] mas
Distance214 ± 2 ly
(65.8 ± 0.5 pc)
Absolute magnitude (MV)1.48[4]
Details
Mass1.27[3] M☉
Radius11[5] R☉
Luminosity42[5] L☉
Surface gravity (log g)2.5[5] cgs
Temperature4,426[5] K
Metallicity [Fe/H]+0.11±0.04[4] dex
Rotational velocity (v sin i)1.4[5] km/s
Age5.2[3] Gyr
Other designations
64 Ari, BD+24°481, HD 21017, HIP 15861, HR 1022, SAO 75912[6]
Database references
SIMBADdata

The visible component is an aging giant star with a stellar classification of K4 III,[2] currently on the red giant branch.[3] It is around 5.2 billion years old with 1.27 times the mass of the Sun.[3] With the supply of hydrogen at its core exhausted, the star has expanded to 11 times the radius of the Sun and it shines with 42 times the Sun's luminosity.[5] This energy is being radiated from the outer envelope at an effective temperature of 4,426 K,[5] giving it the orange-hued glow of a K-type star.

References
  1. 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.
  2. 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.
  3. Hekker, S.; Meléndez, J. (2007), "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters", Astronomy and Astrophysics, 475 (3): 1003, arXiv:0709.1145, Bibcode:2007A&A...475.1003H, doi:10.1051/0004-6361:20078233.
  4. 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.
  5. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  6. "* 64 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
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