
%0 Journal Article
%A Van Der Borght, R. 
%T Vibrational Stability of Pure Helium Stars Surrounded by Pure Hydrogen Envelopes
%J Australian Journal of Physics
%D 1969/08/01
%V 22
%N 4
%P 497-504
%K 
%R https://doi.org/10.1071/PH690497
%U https://www.publish.csiro.au/paper/PH690497 
%X This paper investigates the influence of a pure hydrogen envelope on the vibrational stability of pure helium stars and establishes the limiting mass 88 a function of the fractional mass of such an envelope. It is found that an envelope with a mass fraction of the order of 10-4 will make the star vibrationa.lly stable, even when the total mass of the star is well above the limiting mass for pure helium stars. 
