2021
DOI: 10.3847/1538-3881/ac0ce6
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Abstract: We performed low-resolution spectroscopy for the red giant branch stars in an intriguing globular cluster (GC) NGC 2808, which hosts subpopulations with extreme helium and light-element abundances. In order to trace N, C, and Ca abundance differences among subpopulations, we measured CN, CH, and Ca ii H&K spectral indices, respectively. We identified four subpopulations (G1, G2, G3, and G4) from CN and CH strength, with CN-weak/CH-strong G1, CN-intermediate/CH-strong G2, CN-strong/CH-intermediate G3, and C… Show more

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Cited by 3 publications
(15 citation statements)
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“…A widespread approach to the identification of MPs by chemical abundances or photometric data is the examination of the differences in key elements, such as [O/Na] or CN-CH (e.g., Carretta et al 2009;Carretta 2015;Simpson et al 2017;Guerço et al 2019;Hong et al 2021), or differences in photometric bands or colour indices (e.g., D'Antona et al 2005;Dalessandro et al 2011;Marino et al 2017). MPs are then identified by comparing the element abundances with those of field stars or by peaks in the histogram of these indexes.…”
Section: Methodsmentioning
confidence: 99%
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“…A widespread approach to the identification of MPs by chemical abundances or photometric data is the examination of the differences in key elements, such as [O/Na] or CN-CH (e.g., Carretta et al 2009;Carretta 2015;Simpson et al 2017;Guerço et al 2019;Hong et al 2021), or differences in photometric bands or colour indices (e.g., D'Antona et al 2005;Dalessandro et al 2011;Marino et al 2017). MPs are then identified by comparing the element abundances with those of field stars or by peaks in the histogram of these indexes.…”
Section: Methodsmentioning
confidence: 99%
“…Data from low-resolution spectroscopy were obtained from Hong et al (2021), who measured spectral indexes for CN, CH, and Ca II H&K lines as tracers of N, C, and Ca abundances, respectively, from a sample of 91 RGB stars. To remove the effects of gravity and temperature from these indexes, the authors detrended them by subtracting the mean value of the regression against the magnitude V over the whole sample, obtaining the δCN, δCH, and δHK' indexes, which we adopt in the present analysis.…”
Section: Datamentioning
confidence: 99%
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