Star in the constellation Aries
Omicron Arietis , Latinised from ο Arietis, is the Bayer designation for a single, blue-white-hued star in the northern constellation of Aries . It has an apparent visual magnitude of +5.78, which means it is dimly visible to the naked eye. Based upon an annual parallax shift of 5.49 mas as seen from Earth, it is located roughly 590 light-years from the Sun . At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.22 due to interstellar dust .
This is a B-type main-sequence star with a stellar classification of B9 Vn. The 'n' suffix indicates that it has nebulous absorption lines in its spectrum , which are caused by the Doppler effect and rapid rotation. Indeed, it has a projected rotational velocity of 225 km/s. The star has an estimated 3.45 times the mass of the Sun and about 3.1 times the Sun's radius . It is radiating energy from its photosphere at 248 times the Sun's luminosity with an effective temperature of 10,715 K .
References
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^ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics , 537 : A120, arXiv :1201.2052 , Bibcode :2012A&A...537A.120Z , doi :10.1051/0004-6361/201117691 , S2CID 55586789 .
^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (2) (Third ed.): 5211–524, arXiv :astro-ph/0012289 , Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 .
^ Royer, F.; et al. (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 .
^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters , 38 (11): 694–706, arXiv :1606.09028 , Bibcode :2012AstL...38..694G , doi :10.1134/S1063773712110035 , S2CID 119108982 .
"omi Ari" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-09-28.
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