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25. Commission de Photométrie Stellaire

Published online by Cambridge University Press:  25 April 2016

M. F. H. Seares ,
MM. Baade ,
J. Baillaud ,
Beljawski ,
A. Bemporad ,
Bennett ,
Bergstrand ,
Danjon ,
Dufay  and
Fesenkov
...Show all authors
M. F. H. Seares
Affiliation:
Mount Wilson Observatory, Pasadena, Cal., U.S.A.

Extract

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The committee of the Carte du Ciel in 1910 adopted the following convention : That for Ao stars between magnitudes 5·5 and 6·5 the mean photographic magnitude should equal the mean Harvard visual magnitude. As a corollary, the colour index of Ao stars would then be zero.

The zero point of the photographic magnitudes of the International Polar Sequence was fixed as nearly as possible in accordance with this definition; but it was by no means certain that the magnitudes thus adopted for the few stars of the Sequence represented the zero point defined by all the Ao stars specified.

Type
Part I Reports and Recommendations Presented to the General Assembly by the Executive Committee and the Commissions of the Union
Information
Transactions of the International Astronomical Union , Volume 6 , 1939 , pp. 215 - 228
Copyright
Copyright © International Astronomical Union 1976 1939

References

page no 215 note * Astr. Nach. 186, 40, 1910.

page no 215 note † Mt Wilson Contr. No. 97, p. 16; Ap. J. 41, 221, 1915. Trans. I.A.U. 1, 78, 1922.

page no 215 note ‡ Trans. I.A.U. 1, 71, 1922.

page no 215 note § The basis for this estimate (from magnitudes on international system, stars in regions supposedly free from obscuration) is:

page no 215 note ‖ Mt Wilson Comm. No. 119, p. 4; Proc. Nat. Acad. Sci. 22, 330,1936; also Shapley and Jones, Harv. Bull. No. 905, p. 14, 1937.

page no 215 note * Pettit, , Pub. A.S.P. 46, 30, 1934 Google Scholar.