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Beta Tauri
Beta Tauri (β Tau, β Tauri) is the second brightest star in the constellation Taurus, with an apparent magnitude of 1.68.〔 Ptolemy considered Beta Tauri to be shared by Auriga, and Bayer assigned it a designation in both constellations: Beta Tauri (β Tau) and Gamma Aurigae (γ Aur). When the modern constellation boundaries were fixed in 1930, the latter designation dropped from use.〔(Bayer’s Uranometria and Bayer letters )〕 The star has the traditional name Elnath—a reference to "the butting" of the bull's horns.
== Properties ==
Elnath's absolute magnitude is -1.34, similar to another Taurean star, Maia in the Pleiadian star cluster. Like Maia, Elnath is a B class giant with a luminosity 700 times solar.〔 However being approximately 130 light years distant compared to Maia's estimated 360 light years, Elnath ranks as the second brightest star in the constellation.
Uniquely positioned along the plane of our Milky Way Galaxy a few degrees west of the galactic anticenter, Elnath heralds a rich collection of nebulae and star clusters. Relative to our Sun, β Tauri is notable for a high abundance of manganese, but little calcium and magnesium.〔〔 This star has begun to evolve away from the main sequence.
This star can be occulted by the moon. Such occultations occur when the moon's ascending node is near the vernal equinox, as was the case in 2007. Most occultations are visible only in parts of the Southern Hemisphere, because the star lies at the northern edge of the lunar occultation zone. Rarely, it may be occulted as far north as southern California.〔(Abrams Planetarium - Skywatcher's Diary )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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