casca.cacasca.ca/wp-content/uploads/2014/09/CAS85_1994_Dec.pdf · helium, persists at low effective...
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casca.cacasca.ca/wp-content/uploads/2014/09/CAS85_1994_Dec.pdf · helium, persists at low effective temperatures. In particular, no white dwarf star with a helium-to-hydrogen ratio