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Biography
ForStarbox begin| name=Bellatrix (? Orionis)Starbox image| image = | caption=Location of ? Orionis (circled) Starbox observe| epoch = J2000 | constell = Orion (constellation)|Orion | pronounce = IPA-en|'b?l?tr?ks|| ra = RA|05|25|07.86325 | dec = DEC|+06|20|58.9318 | appmag_v = 1.64 Starbox character| class = B2& nbsp;III | b-v = –0.21 | u-b = –0.86 | variable = EruptiveCitation needed|date=December 2011Starbox astrometry| radial_v = +18.2 | prop_mo_ra = –8.11 | prop_mo_dec = –12.88 | parallax = 12.92 | p_error = 0.52 | parallax_footnote = | absmag_v = Starbox detail| age_myr = 20+-|2|4 | metal_fe = –0.25 | mass = 8.4+-|0.3|0.1 | radius = 6 | rotational_velocity = nowrap|46 ± 8 | luminosity = ~6,400 | gravity = 3.60 | temperature = 22,000 Starbox catalog| names=Bellatrix, ? Orionis, Amazon Star, warrioress, 24 Ori, Al Najid, Harvard Revised catalogue|HR 1790, Bonner Durchmusterung|BD +06°919, Henry Draper catalogue|HD 35468, Smithsonian Astrophysical Observatory Star Catalog|SAO 112740, FK5 201, Hipparcos catalogue|HIP 25336. Starbox end Bellatrix , also known by its Bayer designation Gamma Orionis (? Ori, ? Orionis), is the third brightest star in the constellation Orion (constellation)|Orion . A second-magnitude star, it is list of brightest stars|the twenty-seventh brightest star in the night sky. The name Bellatrix is Latin for female warrior . In the Alfonsine tables , it was also called the Amazons|Amazon Star , a loose translation of the Arabic name Al Najid , the Conqueror. It forms the left shoulder of Orion the Hunter. Bellatrix is one of the four navigational stars in Orion that are used for celestial navigation . The Chinese language|Chinese name for the star is ??? (" The Fifth of the Three Stars ").
This is a massive star with about 8.4 times the solar mass|Sun's mass . It has an estimated age of approximately 20 million years; long enough for a star of this mass to consume the hydrogen at its core and begin to evolve away from the main sequence into a giant star . The effective temperature of the outer envelope of this star is 22,000& nbsp;K, which is considerably hotter than the 5,778& nbsp;K on the Sun. This high temperature gives this star the blue-white hue that occurs with B-type star s. The measured angular diameter of this star, after correction for limb darkening , is nowrap|0.72 ± 0.04 milliarcsecond|mas . At an estimated distance of Convert|250|ly|pc|abbr=off|lk=on, this yields a physical size of about six times the Solar radius|radius of the Sun .
Since 1963, Gamma Orionis was included with a set of bright stars that astronomers employ as a luminosity standard. These are used for comparison with other stars to check for variability, and so by definition, the apparent magnitude of Gamma Orionis was set to 1.64. However, when an all-sky Photometry (astronomy)|photometry survey was carried out in 1988, this star was itself found to be variable. It ranges in apparent magnitude from 1.59 to 1.64.
Bellatrix was once thought to belong to the Orion OB1 Association of stars that share a common motion through space, along with the "Orion's Belt" stars Zeta Orionis|? Ori (Alnitak), Epsilon Orionis|e Ori (Alnilam), and Delta Orionis|d Ori (Mintaka). However, this is no longer believed to be the case, asGamma Orionis is now known to be much closer than the rest of the group. It is not known to have a stellar companion. A 2011 search for nearby companions failed to conclusively find any objects that share a proper motion with Bellatrix. Three nearby candidates were all found to be background stars.
References
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