Abstract We propose a modest payload, using a simple telescope and well known technology, with the aim of placing the probing of stellar interiors on an experimental basis. Indeed, a number of physical processes, the seat of which is in stellar interiors and which are of basic importance for physics and astrophysics, have not yet been mastered : convection, differential rotation, dynamo generation of magnetic fields, etc…Collecting significant observations is of prime importance to elucidate those phenomena. Two types of observations are sought : -The pulsation spectrum (detection of microvariability at the level of that found in the Sun, i.e. 10−6 mag). -The active phenomena of magnetic origin in the atmosphere, at various altitudes simultaneously, for a representative sample of stars over the Hertzsprung-Russell diagram. The basic requirements are long series of continuous and homogeneous observations with high photometric accuracy -in white light -in four spectroscopic indices, three of them being in the UV range (CaII λ 3933 A, MgII λ 2800 A, HeII λ 1640 A, CIV λ 1550 A). The motives to perform these observations from space will be analyzed.


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    Title :

    On the PSIVA approach to stellar seismology and activity from space


    Contributors:
    Praderie, F. (author) / Mangeney, A. (author) / Lemaire, P. (author)

    Published in:

    Publication date :

    1985-01-01


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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