Bibcode
Luridiana, V.
Bibliographical reference
Revista Mexicana de Astronomia y Astrofisica, 29, 153
Advertised on:
7
1994
Citations
1
Refereed citations
1
Description
The evolution of Population II Red Giants has been studied by adopting
Reimers' formalism for the efficiency of mass loss. Evolutionary
computations for models of 0.8M0, Y = 0.23 and Z = 0.0002 are presented
for a wide range of values of the parameter TI governing the mass loss
rate. We find that for values of TI greater than about 0.70 the decrease
in the envelope mass forces the star to leave the RGB before undergoing
the He flash. However the core evolution is not affected by the surface
conditions until long after the RG phase, and models with TI less than
0.80 eventually succeed in igniting the helium on the blue side of the
H-R diagram. The variation of sud a scenario with metallicity is also
discussed. Finally, we analyze the production and cooling of He white
dwarfs produced by the mass loss mechanism. Theoretical constraints
concerning the possible occurrence of He dwarfs are discussed, showing
that even a 10% of RG stragglers can give contribution to the white
dwarfs' cooling sequence observed in clusters.