... sdB stars . sdO stars . PG1159 stars, [WC] stars and DO white dwarfs.. ... B stars are about 0.5 solar masses, and are thought to be almost pure helium stars ... core. sdOB stars are related to sdB stars, possibly being the sdB stars which have ...
... star, but the star certainly loses mass between leaving the main sequence and ... is not space here to look at what happens to stars with companions, binary stars ... stars are responsible for cataclysmic variables or dwarf novae, which contain a ...
... Stars about ten solar masses probably behave like our five solar mass star until ... outer layers of the star are still rushing away from a tiny star in the centre ...
... Next: UNSOLVED PROBLEMS Up: OTHER HYDROGEN-DEFICIENT STARS Previous: Carbon stars . ... century, three stars have been observed as being both hot subdwarfs and RCB stars at ...
... W OLF- R AYET STARS are young (Population I) hydrogen-deficient stars, as are binary ... As well as RCB stars with F- and G-type spectra, several other stars show RCB type ...
... Borealis stars (RCB) stars are one of the longest known classes of variable star ... stars are unusually poor in hydrogen, and rich in carbon and nitrogen, which implies ... Hydrogen-deficient carbon stars . Extreme helium stars and hot RCB stars . ...
... Stars Up: C.S. Jeffery, Research Astronomer Previous: Subluminous B Stars ... Our research on extreme helium stars and other post-AGB stars is directed towards ... a cool star, rich in metal lines will be replaced by that of a hot star, dominated ...
... Our research on extreme helium stars and other post-AGB stars is directed towards ... connections between cool RCoronae Borealis stars and the hotter extreme helium stars ...
... to see inside a star, and it is impossible to create a real star in the laboratory ... star, its temperature, pressure, and so on, all the way from the surface of the star ...