SIMBAD references

1999MNRAS.309L..19H - Mon. Not. R. Astron. Soc., 309, L19-L23 (1999/October-3)

The domain of gamma Doradus variables in the Hertzsprung-Russell diagram.


Abstract (from CDS):

70 new γ Doradus candidates were identified from Hipparcos photometry, which represents more than a doubling of the presently known number. Selecting the objects with good evidence for multiperiodicity, it is found that these stars, together with bona fide members of the class, occupy a well-defined region in a colour-magnitude diagram. This domain corresponds to a range of 7200-7700K on the zero-age main sequence (ZAMS) and 6900-7500K one magnitude above it, which partly overlaps with the instability strip of δ Scuti stars.

For the first time, γ Doradus stars can be discussed as a group. They can be found over a significant fraction of the main sequence lifetimes for objects in the relevant temperature range. An upper limit on the surface metallicity of γ Doradus stars is apparent, which may guide the search for their pulsation driving mechanism. The importance of possible objects exhibiting both γ Doradus and δ Scuti-type pulsations is discussed.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): Hertzsprung-Russell (HR) diagram - stars: oscillations - δ Scuti - stars: variables: other

Simbad objects: 82

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