33 Arietis

33 Arietis (abbreviated 33 Ari) is a binary star[2] in the northern constellation of Aries. 33 Arietis is the Flamsteed designation. The combined apparent magnitude of 5.33[2] is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 14.09 mas,[1] the distance to this system is approximately 231 light-years (71 parsecs).

33 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 40m 41.07563s[1]
Declination +27° 03′ 39.4040″[1]
Apparent magnitude (V) +5.33[2]
Characteristics
Spectral type A3 V[3]
U−B color index +0.13[4]
B−V color index +0.09[4]
Astrometry
Radial velocity (Rv)+21.0[5] km/s
Proper motion (μ) RA: +64.83[1] mas/yr
Dec.: -26.05[1] mas/yr
Parallax (π)14.09 ± 0.32[1] mas
Distance231 ± 5 ly
(71 ± 2 pc)
Details
Rotational velocity (v sin i)107[6] km/s
Other designations
BD+26° 443, HD 16628, HIP 12489, HR 782, SAO 75510.[7]
Database references
SIMBADdata

The primary component is an A-type main sequence star with a magnitude of 5.40 and a stellar classification of A3 V. It has a magnitude 8.40 companion at an angular separation of 28.6 arcseconds. An excess of infrared emission suggests the presence of circumstellar dust in this system. In the 24μm band, this debris disk has a mean temperature of 815 K, which puts it at a radius of 0.85 astronomical units (AU) from the primary star. Excess emission appears in the 70μm band, which has a temperature of 103 K and a radius out to 42 AU.[8]

References
  1. 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, S2CID 18759600.
  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, S2CID 14878976.
  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. Osawa, K.; Hata, S. (1960), "Three colour photometry of B8-A2 stars", Annals of the Tokyo Astronomical Observatory, 6: 148, Bibcode:1960AnTok...6..148O.
  5. Palmer, D. R.; et al. (1968), "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars", Royal Observatory Bulletin, 135: 385, Bibcode:1968RGOB..135..385P.
  6. Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  7. "33 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-15.
  8. Trilling, D. E.; et al. (April 2007), "Debris disks in main-sequence binary systems", The Astrophysical Journal, 658 (2): 1264–1288, arXiv:astro-ph/0612029, Bibcode:2007ApJ...658.1289T, doi:10.1086/511668, S2CID 14867168.
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