... Conditions are like those inside a white dwarf. ... It is not well understood what changes are caused inside the star, but the star certainly loses mass between leaving the main sequence and becoming a helium-burning horizontal branch star. When core helium burning ends, the low mass star rejoins the asymptotic giant branch, where the hydrogen and helium burning shells interact, causing a series of thermal pulses. ... Stars less than one third of a solar mass will not ignite helium at all. ...

... Simple use of pointers . ... Allocation of arrays using pointers . ... REAL, TARGET :: B(10,10) REAL, POINTER :: A(:,:) A => B The matrix B has been specified completely, i.e. with the dimensions given explicitly. ... You have to be careful when you use pointers. ... REAL, TARGET :: MATRIX(100,100) REAL, POINTER :: WINDOW(:,:) INTEGER :: N1, N2, M1, M2 WINDOW => MATRIX(N1:M1, N2:M2) If you later wish to change a dimension of the partial matrix WINDOW you only need to make a new pointer association. ...