Potassium Abundances in Red Giants of Mildly to Very Metal-Poor Globular Clusters
نویسندگان
چکیده
منابع مشابه
Se p 19 99 Chemical Abundances of Bright Giants in the Mildly Metal - Poor Globular Cluster
We present a chemical composition analysis of three dozen giant stars in the nearby “CN-bimodal” mildly metal-poor (<[Fe/H]> = -1.18) globular cluster M4. The analysis combined traditional spectroscopic abundance methods with modifications to the line-depth ratio technique pioneered by Gray (1994). Silicon and aluminum are found to be primordially overabundant by factors exceeding the mild over...
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Many low-metallicity globular clusters exhibit large star-to-star variations of C, N, O, Na, Mg, & Al abundances. In higher-metallicity clusters, the abundance swings are muted. Evidence of anticorrelations of O versus Na and Mg versus Al exists in classical northern-hemisphere clusters spanning a range of metallicities, –0.8 ≤ [Fe/H] ≤ –2.2. These and other anticorrelations, observed to be a f...
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We present a chemical composition analysis of 36 giant stars in mildly metal-poor globular cluster M5. In comparing the M5 results to those obtained in M4, a cluster previously considered to be a “twin” in age, metallicity and chemical composition, we find large star-to-star variations in the abundances of elements sensitive to proton-capture nucleosynthesis, similar [Fe/H] values, but factor o...
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We demonstrate a significant (> 5σ) correlation between the mean color of metalpoor globular cluster (GC) systems and parent galaxy luminosity. A Bayesian Markov Chain Monte Carlo method is introduced to find the mean color, and is easily generalizable to quantify multimodality in other astronomical datasets. We derive a GC color– galaxy luminosity relation of the form Z ∝ L. When combined with...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Japan
سال: 2009
ISSN: 0004-6264,2053-051X
DOI: 10.1093/pasj/61.3.563