REVERSED TREND of RADIAL DISTRIBUTION of SUBPOPULATIONS in the GLOBULAR CLUSTERS NGC 362 and NGC 6723

Dongwook Lim, Young Wook Lee, Mario Pasquato, Sang Il Han, Dong Goo Roh

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Most globular clusters (GCs) are now known to host multiple stellar populations with different abundances of light elements. Here we use narrow-band photometry and low-resolution spectroscopy for NGC 362 and NGC 6723 to investigate their chemical properties and radial distributions of subpopulations. We confirm that NGC 362 and NGC 6723 are among the GCs with multiple populations showing bimodal CN distribution and CN-CH anticorrelation without a significant spread in calcium abundance. These two GCs show more centrally concentrated CN-weak, earlier generation stars compared to the CN-strong, later generation stars. These trends are reversed with respect to those found in previous studies for many other GCs. Our findings, therefore, seem contradictory to the current scenario for the formation of multiple stellar populations, but mass segregation acting on the two subpopulations might be a possible solution to explain this reversed radial trend.

Original languageEnglish
Article number99
JournalAstrophysical Journal
Volume832
Issue number2
DOIs
Publication statusPublished - 2016 Dec 1

Fingerprint

globular clusters
subpopulation
chemical property
calcium
spectroscopy
trends
stars
light elements
radial distribution
chemical properties
photometry
narrowband
methylidyne
distribution
trend

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lim, Dongwook ; Lee, Young Wook ; Pasquato, Mario ; Han, Sang Il ; Roh, Dong Goo. / REVERSED TREND of RADIAL DISTRIBUTION of SUBPOPULATIONS in the GLOBULAR CLUSTERS NGC 362 and NGC 6723. In: Astrophysical Journal. 2016 ; Vol. 832, No. 2.
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REVERSED TREND of RADIAL DISTRIBUTION of SUBPOPULATIONS in the GLOBULAR CLUSTERS NGC 362 and NGC 6723. / Lim, Dongwook; Lee, Young Wook; Pasquato, Mario; Han, Sang Il; Roh, Dong Goo.

In: Astrophysical Journal, Vol. 832, No. 2, 99, 01.12.2016.

Research output: Contribution to journalArticle

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AU - Lee, Young Wook

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AU - Roh, Dong Goo

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AB - Most globular clusters (GCs) are now known to host multiple stellar populations with different abundances of light elements. Here we use narrow-band photometry and low-resolution spectroscopy for NGC 362 and NGC 6723 to investigate their chemical properties and radial distributions of subpopulations. We confirm that NGC 362 and NGC 6723 are among the GCs with multiple populations showing bimodal CN distribution and CN-CH anticorrelation without a significant spread in calcium abundance. These two GCs show more centrally concentrated CN-weak, earlier generation stars compared to the CN-strong, later generation stars. These trends are reversed with respect to those found in previous studies for many other GCs. Our findings, therefore, seem contradictory to the current scenario for the formation of multiple stellar populations, but mass segregation acting on the two subpopulations might be a possible solution to explain this reversed radial trend.

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