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HD 219843


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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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Osservazione e dati astrometrici

Costellazione:Andromeda
Ascensione retta:23h18m42.26s
Declinazione:+36°05'24.8"
Magnitudine apparente:7.375
Distanza:137.174 parsec
Moto proprio RA:57.9
Moto proprio Dec:13.6
B-T magnitude:7.729
V-T magnitude:7.405

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 219843
TYCHO-2 2000TYC 2764-478-1
USNO-A2.0USNO-A2 1200-19816076
HIPHIP 115093

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