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25. Commission de Photométrie Stellaire

Extract

The following summarizes the activities of various members of the Commission in matters pertaining to stellar photometry during the interval 1932-35:

La partie photométrique des trois derniers volumes du Catalogue Astrographique (zone de Catane entre +46° et +55°) est soigneusement dressée sur le système de Miss Leavitt (Harv. Annals, 81). L’erreur moyenne des grandeurs, d’après la réduction de 100 plaques (zones +51° à + 54°, entre 6h et I2h), n’est que de ± om.o8. Nos réductions photométriques ont été effectuées par la formule

D = a-bg+cg2-dg3,

D dénote le diamètre de l’image photographique et G=8m+g dénote la grandeur de l’étoile.

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