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Age variation of helium abundance in He-rich stars.

Glagolevskij, Yu. V.

Investigations of the He abundance variation depending on the age of He-rich stars have been continued. A comparison of the Hipparcos satellite absolute magnitudes and lg g with data obtained previously from the β parameters of multicolour photometry has shown good agreement (Gomez et al., 1998). A critical revision of all previous data, using the…