On the physical nature of Delta Delphini stars

Details On the physical nature of Delta Delphini stars On the physical nature of Delta Delphini stars

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..259s&link_type=abstract

Astronomy and Astrophysics, vol. 101, no. 2, Aug. 1981, p. 259-264.

Astronomy and Astrophysics

Astrophysics

8

Diffusion, Stellar Envelopes, Stellar Models, Variable Stars, Abundance, Helium, Mixing Length Flow Theory, Radial Velocity, Stellar Temperature

Scientific paper

In the red side of the instability strip the existence of pulsators among Delta Del stars, showing abundance anomalies, appears in contradiction with the diffusion theory which predicts that helium is completely sorted down from the outer layers. In this paper it is proposed that the envelopes of Delta Del stars are not completely deprived from helium. A partial mixing would produce intermediate He content, allow for the high metals abundances and restore a normal abundance of calcium. Models computed with recent physical data show that for log T less than 3.9 variability is obtained for Y = 0.18. The proportion of known variables is consistent with the assumption that all Delta Del are variable and their mean rotational velocity is higher than for classical Am.

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