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.

Mynd/Myndskeið:
ESO

Um myndina

Auðkenni:eso0215b
Tegund:Líkan
Útgáfudagur:15. maí 2002
Tengdar fréttatilkynningar:eso0215
Stærð:785 x 778 px

Um fyrirbærið

Nafn:xi Hya
Tegund:Milky Way : Star : Evolutionary Stage : Red Giant
Fjarlægð:130 ljósár
Flokkur:Stars

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