Gemini/Phoenix H-band analysis of the globular cluster AL3

Understand

The globular cluster AL~3 is old and located in the inner bulge.

• Three individual stars were observed with the Phoenix spectrograph at the Gemini South telescope.
• The wavelength region contains prominent lines of CN, OH, and CO, allowing the derivation of C, N, and O abundances of cool stars.
• We aim to derive C, N, O abundances of three stars in the bulge globular cluster AL3, and additionally in stars of NGC 6558 and HP1.