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"Stellar magnetism"

International Conference Proceedings,

1992 ,

36-50 .

ON DEPENDENCE OF CHEMICAL ELEMENTS ABUNDANCE IN THE ATMOSPHERES OF HE-RICH STAR S UPON AGE

Yu. V.GLAGOLEVSKIJ ,

G. P TOPILSKAJA , T.A.KARTASHOV A

Specia l Astrophysica l Observator y o f Russia n AS , Nizhni j Arkhy z 357147 , Russi a

ABSTRACT.

The

dependence

of

the

helium

abundance

upon

age

has

been

investigated for He-r type stars.

It was shown that

the helium abundance in to normal one, then was

the beginning of life on the Main sequence was close helium was gradually accumulated were on on the the surface. of

Maximal the Main

abundance sequence elements,

reached when He-r Analogous

star

top part for

band. but

dependences

were

investigated

other

chemical

due to small amount of observational results they are not confident.