What question did this study set out to answer?

To analyze the high-resolution optical spectra of NGC 6558 and derive key stellar parameters and metallicity.

June 18, 2026Open Access

High Resolution Spectroscopic Analysis of Selected Bulge Globular Clusters: A case study for NGC6558

Key Points

To analyze the high-resolution optical spectra of NGC 6558 and derive key stellar parameters and metallicity.
Utilized GIRAFFE optical spectra from the target 2MASS J18101117–3144580.
Derived equivalent-width measurements and stellar atmosphere parameters.
Compared optical results with APOGEE/CAPOS near-infrared literature values.
Derived metallicity and abundance ratios for selected alpha elements in NGC 6558.
Found consistency between optical and near-infrared abundance analyses.
Provided groundwork for future optical-NIR comparison studies.

Abstract

This poster presents a preliminary high-resolution spectroscopic analysis of the bulge globular cluster NGC 6558. Optical GIRAFFE spectra of the selected target 2MASS J18101117–3144580 are used to derive equivalent-width measurements, stellar atmosphere parameters, metallicity, and preliminary abundance ratios for selected alpha elements. These optical results are compared with APOGEE/CAPOS near-infrared literature values to assess the consistency between optical and NIR abundance analyses and to provide a first step toward a broader optical–NIR comparison for NGC 6558.

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