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).



About the Image

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

Image Formats

Large JPEG
189.2 KB
Screensize JPEG
249.8 KB

Colours & filters

Very Large Telescope


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