Galactic Astronomy. 5. Metallicities of GCs 6. The 3 rd parameter. Dong-hyun Lee 2007/05/14. Metallicities of GCs. Variation b/w shapes of sequence in globular CMD – due to metallicites Narrowness ← chemically homogeneous Particular evolution point : metallicities broadening
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5. Metallicities of GCs
6. The 3rd parameter
⇒ proton capture enhance Na & Al in cores
→ dredge up O-deficient material bring Na- & Al- enhanced material to the surf. of star