• 제목/요약/키워드: Globular Cluster

검색결과 210건 처리시간 0.039초

NEAR-IR GIANT BRANCH SLOPE-METALLICITY RELATION OF OPEN CLUSTERS

  • KYEONG JAE-MANN;BYUN YONG-IK
    • 천문학회지
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    • 제34권3호
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    • pp.137-141
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    • 2001

  • We derive a new relationship between the giant branch slope as measured in the color-magnitude diagram (K, J - K) and [Fe/H] metallicity for old open clusters. Previously such relationships have been derived for globular clusters, while similar tendency has been expected for open clusters. New derived correlation, [Fe/H]=-17.2($\pm$0.23)GB slope - 1.95($\pm$0.02), is based on a collection of data for 10 old open clusters. Most clusters behave as expected from the theoretical predictions.

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New Photometric System for CN and CH

  • Lee, Jae-Woo
    • 천문학회보
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    • 제41권2호
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    • pp.43.2-43.2
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    • 2016

  • During the last decade, there has been a dramtic paradigm shift on the definition of the globular cluster (GC) systems. The decades-long lighter elemental variation issue in GC stars is now considered to be a generic feature of normal GCs in our Galaxy, most likely engraved during the multiple-phase normal GC formation. In this talk, we will introduce the new photometric system, so-call the JWL System, to measure CN and CH abundances in multiple stellar populations in GCs. The utility and the future application of the JWL System will be discussed.

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