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.

Kredit:
ESO

O snímku

Id:eso0215b
Typ:Simulace
Datum zveřejnění:15. května 2002
Související články:eso0215
Velikost:785 x 778 px

O objektu

Jméno:xi Hya
Typ:Milky Way : Star : Evolutionary Stage : Red Giant
Vzdálenost:130 světelné roky
Kategorie:Stars

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