Roter Riese (Typ M) - Mira, Gacrux, Ras Algethi, Mirach, Tejat Prior, Menkar, Tejat Posterior (English, German, Paperback)

Aus Wikipedia. Nicht dargestellt. Auszug: Mu Geminorum (? Gem / ? Geminorum) is a star in the constellation Gemini, approximately 230 light years away from Earth. It has the traditional names Tejat Posterior, which means back foot, and Tejat, because it is the foot of Castor, one of the Gemini twins. The names Calx (Latin, meaning heel) and Pish Pai (from the Persian P?shp?y,, meaning foreleg) have also been applied to this star. The names Mu Geminorum is an irregular variable of type LB. Its brightness varies between magnitude +2.75 and +3.02 over a 72 day period, with a 2,000 day period of long term variation. It is a red giant of the spectral class M3, with a surface temperature of 3,650 kelvins, meaning it is brighter, yet cooler than our Sun. ...http: //booksllc.net/?l=de