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.

Mynd/Myndskeið:

ESO

Um myndina

Auðkenni:eso0432a
Tegund:Skýringarmynd
Útgáfudagur:29. október 2004
Tengdar fréttatilkynningar:eso0432
Stærð:800 x 592 px

Um fyrirbærið

Nafn:Interferometry, Spectrograph, Stars
Tegund:Unspecified : Star : Type : Variable
Flokkur:Illustrations
Stars

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