Non-radial oscillations in the giant star xi Hya

A computer-generated illustration of one possible non-radial oscillation mode in the giant star xi Hya. The blue parts contain particles in the upper stellar atmosphere moving away from the stellar centre, hence they cause a "blue-shift" (towards shorter wavelengths) in the spectrum for the observer. At the same time, particles in the red parts move towards the stellar centre and cause a "red-shift" (towards longer wavelengths). Particles in the white regions do not move during the oscillation cycle. Half an oscillation cycle later, the red parts will have become blue and vice versa.

Credit:
ESO

Over de afbeelding

Id:eso0215b
Type:Simulatie
Publicatiedatum:15 mei 2002
Gerelateerde berichten:eso0215
Grootte:785 x 778 px

Over het object

Naam:xi Hya
Type:Milky Way : Star : Evolutionary Stage : Red Giant
Afstand:130 lichtjaren
Categorie:Stars

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