Spectra of dwarf stars in NGC 6752

A series of spectra of dwarf stars in the globular cluster NGC 6752, obtained with the UVES high-dispersion spectrograph at the 8.2-m VLT KUEYEN telescope. Sodium (Na) and Oxygen (O) lines are marked, and the spectra are arranged according to the strength of the Sodium lines, with the strongest at the top. It is obvious that stars with stronger Sodium lines (and therefore with a higher Sodium abundance) have weaker Oxygen lines (and are therefore poorer in Oxygen). Even with UVES, the most powerful high-resolution astronomical spectrograph in the world, exposures of up to 4.5 hours were required to record good spectra of these faint objects (V-mag = 17.2).

Crédit:

ESO

À propos de l'image

Identification:eso0107b
Type:Observation
Date de publication:2 mars 2001
Communiqués de presse en rapport:eso0107
Taille:800 x 783 px

À propos de l'objet

Nom:NGC 6752
Type:Milky Way : Star : Grouping : Cluster : Globular
Catégorie:Stars

Formats des images

Grand JPEG
189,3 Kio
JPEG taille écran
250,0 Kio

Couleurs & filtres

DomaineTélescope
Infrarouge
Near-IR
Very Large Telescope
UVES