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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.
Credit:ESO
Over de afbeelding
Id: | eso0432a |
Type: | Kaart |
Publicatiedatum: | 29 oktober 2004 |
Gerelateerde berichten: | eso0432 |
Grootte: | 800 x 592 px |
Over het object
Naam: | Interferometry, Spectrograph, Stars |
Type: | Unspecified : Star : Type : Variable |
Categorie: | Illustrations Stars |