POTASSIUM: A NEW ACTOR ON THE GLOBULAR CLUSTER CHEMICAL EVOLUTION STAGE. THE CASE OF NGC 2808

We derive [K/Fe] abundance ratios for 119 stars in the globular cluster NGC 2808, all of them having O, Na, Mg and Al abundances homogeneously measured in previous works. We detect an intrinsic star-to-star spread in the Potassium abundance. Moreover [K/Fe] abundance ratios display statistically sig...

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Bibliographic Details
Published in:The Astrophysical journal 2015-03, Vol.801 (1), p.68
Main Authors: Mucciarelli, Alessio, Bellazzini, Michele, Merle, Thibault, Plez, Bertrand, Dalessandro, Emanuele, Ibata, Rodrigo
Format: Article
Language:English
Subjects:
Astrophysics
Physics
Solar and Stellar Astrophysics
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Summary:We derive [K/Fe] abundance ratios for 119 stars in the globular cluster NGC 2808, all of them having O, Na, Mg and Al abundances homogeneously measured in previous works. We detect an intrinsic star-to-star spread in the Potassium abundance. Moreover [K/Fe] abundance ratios display statistically significant correlations with [Na/Fe] and [Al/Fe], and anti-correlations with [O/Fe] and [Mg/Fe]. All the four Mg deficient stars ([Mg/Fe]
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1088/0004-637X/801/1/68