11 Arietis

Star in the Aries constellation J2000 02 06 49.23558 +25 42 16.3939 6.01 Aries B9 IV-Vn −0.04 −0.26 −9 +19.46 −14.31 3.72 0.38 2.8 249 BD+25°349, HD 12885, HIP 9859, HR 615, SAO 75149. 11+Ari 11 Arietis (abbreviated 11 Ari) is a star in the northern constellation of Aries. 11 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.01, which makes it a challenging target to view with the naked eye in suitably dark skies. Based upon an annual parallax shift of 3.72 mas, the distance to this star is approximately 880 ly pc off on. 11 Arietis has a stellar classification of B9 IV-Vn, which may indicate that it is beginning to evolve away from the main sequence into a subgiant as the supply of hydrogen at its core becomes exhausted. At present, it has an estimated radius of 2.8 times that of the Sun, but this will increase as it continues to evolve into a giant star. 11 Arietis is spinning rapidly with a projected rotational velocity of 249 km/s. This motion, combined with the Doppler effect, is causing the absorption lines in the spectrum to spread out and become 'nebulous', as indicated by the 'n' suffix in the classification. References F. van Leeuwen November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 2007A&A...474..653V 10.1051/0004-6361:20078357 0708.1752 18759600 . Cowley A. Spectral classification of the bright B8 stars Astronomical Journal 77 750–755 10.1086/111348 1972AJ.....77..750C . November 1972 Wilson Ralph Elmer 1953 General Catalogue of Stellar Radial Velocities Carnegie Institute Washington D.C. Publication Carnegie Institution of Washington Washington 1953GCRV..C......0W . Royer F. Zorec J. Gómez A. E. Rotational velocities of A-type stars. III. Velocity distributions Astronomy and Astrophysics 463 2 671–682 10.1051/0004-6361:20065224 2007A&A...463..671R astro-ph/0610785 . February 2007 18475298 Crawford D. L. U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars Astrophysical Journal 137 530 10.1086/147526 1963ApJ...137..530C . February 1963 free 1 Pasinetti Fracassini L. E. Pastori L. Covino S. Pozzi A. Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics Astronomy and Astrophysics 367 521–524 10.1051/0004-6361:20000451 2001A&A...367..521P astro-ph/0012289 . February 2001 2 425754 1 Høg E. Fabricius C. Makarov V. V. Urban S. Corbin T. Wycoff G. Bastian U. Schwekendiek P. Wicenec A. The Tycho-2 catalogue of the 2.5 million brightest stars Astronomy and Astrophysics 355 L27–L30 March 2000 2000A&A...355L..27H . 10.1888/0333750888/2862 11 Ari 2012-07-18 External links HR 615 CCDM J02068+2542 Image 11 Arietis Category:B-type main-sequence stars 012885 Arietis, 11 009859 Category:Aries (constellation) 0615 Category:Durchmusterung objects