Next: MASSES Up: EXTREME HELIUM STARS: PULSATION Previous: STELLAR PROPERTIES . ... Following main-sequence evolution, a red giant star in a close binary system may expand to fill its Roche lobe. ... Although Iben & Tutukov (1984) used this model to account for the EHes, the latter are not binaries (Jeffery et al. ... Final helium-shell flash in a post-AGB star. ... Accretion from the disk onto the surviving WD creates a star with a degenerate CO core and a helium envelope. ... Other models. ...

... Bo Einarsson, born 1939, has more than 30 years of experience as a Fortran programmer and as a teacher in Fortran. He has been a principal scientific officer and director of research at the Swedish National Defence Research Institute in Tumba and Ume . ... He joined Link ping University as director of the university computing center and is now an associate professor in the mathematics department with teaching in Numerical Methods and Fortran Programming . ... University of Link ping . ...