Observation techniques of the Baade-Wesselink method

The two observation techniques used for the interferometric version of the Baade-Wesselink method are high-resolution spectroscopy (left) and interferometry (right). The former provides the radial velocity curve over the pulsation cycle of the star. When integrated, this in turn provides the linear radius variation of the star (in metres). The interferometric observations document variation of the star's angular radius. The ratio of these two quantities gives the distance of the Cepheid.

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ESO

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Identificador:eso0432a
Tipo:Mapa
Fecha de publicación:29 de Octubre de 2004
Noticias relacionadas:eso0432
Tamaño:800 x 592 px

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Nombre:Interferometry, Spectrograph, Stars
Tipo:Unspecified : Star : Type : Variable
Categoría:Illustrations
Stars

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