Uranium in the spectrum of an old star

The observed spectrum (dots) of the old star HE 1523-0901in the region of the uranium (U II) line at a wavelength of 385.96 nm. The origin of some of the other spectral lines in the region is also indicated (e.g. iron, neodymium, samarium, magnesium). The synthetic spectrum (thin and dotted lines) was computed for the adopted abundances of the stable elements and for four different values of the abundance of uranium atoms in the atmosphere of the star. The uppermost line (corresponding to no uranium at all) clearly does not fit the observed spectrum at all. The best fit is provided by the middle (red) line.

Crediti:

ESO

Riguardo l'immagine

Identificazione:eso0723b
Tipo:Osservazione
Data di rilascio:10 Maggio 2007
Notizie relative:eso0723
Grandezza:1184 x 795 px

Riguardo all'oggetto

Nome:HE 1523-0901
Tipo:Milky Way : Star
Distanza:90 Anni luce
Categoria:Stars

Formati delle immagini

JPEG grande
138,0 KB

Colori e filtri

BandaLunghezza d'ondaTelescopio
Ultravioletto
UII
385 nmVery Large Telescope
UVES