%0 Journal Article
%A Giménez, A.
%A Reglero, V.
%A Castro Rubio, Elisa De
%A Fernández Figueroa, María José
%T A uvbyß survey of northern-hemisphere active binaries .2. The m_1 deficiency
%D 1991
%@ 0004-6361
%U https://hdl.handle.net/20.500.14352/59715
%X New photometric observations, using the uvby and Hß systems of 72 northern-hemisphere active binaries are discussed in order to explain the main characteristics of their spectral light intensity distribution. Values of the parameter δm_1 range from 0.0 to 0.3 mag, which cannot be explained in terms of metal underabundance alone. The existence of some mechanism, responsible for such a colour-index anomaly, is thus suggested and is found to be in close relation with the involved degree of solar-type activity.
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