Shaula (Lambda Scorpii)
Shaula is a subgiant B star with a temperature around 25,000 K and a total luminosity that is about 35,000 that of the Sun. It is, however, a close double made of roughly similar hot stars with an orbital period of 5.9 days. There may also be a third, more distant companion, possibly a white dwarf given that Shaula is an unusually strong source of low-energy X-rays.
Shaula has either stopped hydrogen fusion in its core or is close to doing so. With a mass of around 11 solar masses, it may eventually explode or more likely turn into a heavy white dwarf, possibly one with a neon-oxygen core. Like Mirzam, it is a Beta Cephei star, fluctuating by less than a tenth of a magnitude with two simultaneous periods of 0.21 and 0.11 days.
Related entry brightest stars
Related category NOTABLE STARS
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact