A RED GIANT WITH A STRANGE STAR AS ITS CORE. PRINCIPAL SIMILARITIES TO AND DIFFERENCES FROM THORNE-ZYTKOW OBJECTS

A model red giant with a mass of 5 M a luminosity of 41,740 L^, and a radius of 960 R and with a strange quark star as its core is constructed, and it is compared with a Thome-Zytkow object having similar integrated parameters. The difference in internal structure is manifested right at the dense core: matter above the core is held off only by rays from the strange star, and convection is maintained down to the strange star. The lifetime of a red giant containing a strange star turns out lo be almost 500 times shorter than that of a Thorne-Zytkow object - on the order of 10^5 years.