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).

Credit:

ESO

About the Image

Id:eso0107b
Type:Observation
Release date:2 March 2001
Related releases:eso0107
Size:800 x 783 px

About the Object

Name:NGC 6752
Type:• Milky Way : Star : Grouping : Cluster : Globular
• X - Stars

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Colours & filters

BandTelescope
Infrared
Near-IR
Very Large Telescope
UVES

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