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The domain of γ Doradus variables in the Hertzsprung-Russell diagram
70 new γ Doradus candidates were identified from Hipparcosphotometry, which represents more than a doubling of the presently knownnumber. Selecting the objects with good evidence for multiperiodicity,it is found that these stars, together with bona fide members of theclass, occupy a well-defined region in a colour-magnitude diagram. Thisdomain corresponds to a range of 7200-7700K on the zero-age mainsequence (ZAMS) and 6900-7500K one magnitude above it, which partlyoverlaps with the instability strip of δ Scuti stars. For thefirst time, γ Doradus stars can be discussed as a group. They canbe found over a significant fraction of the main sequence lifetimes forobjects in the relevant temperature range. An upper limit on the surfacemetallicity of γ Doradus stars is apparent, which may guide thesearch for their pulsation driving mechanism. The importance of possibleobjects exhibiting both γ Doradus and δ Scuti-typepulsations is discussed.
| Mesures d'étoiles doubles effectuées au télescope de 80 cm. de l' Observatoire de Marseille
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| Takýmyýldýz: | Zincirli Prenses |
| Sað Açýklýk: | 23h18m42.26s |
| Yükselim: | +36°05'24.8" |
| Görünürdeki Parlaklýk: | 7.375 |
| Uzaklýk: | 137.174 parsek |
| özdevim Sað Açýklýk: | 57.9 |
| özdevim Yükselim: | 13.6 |
| B-T magnitude: | 7.729 |
| V-T magnitude: | 7.405 |
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