Browsing by Author "Henao Ocampo, Lady Johana"

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    Galactic Bulge Globular Clusters with CAPOS Survey: HP 1.
    (Universidad de Concepción, 2024) Henao Ocampo, Lady Johana; Villanova, Sandro; Geisler, Douglas
    Galactic Bulge Globular Clusters (BGCs) are crucial fossil relics for understanding the early formation and evolution of our galaxy. The CAPOS (Bulge Cluster APOgee Survey) project aims to study these ancient objects in detail, using the APOGEE spectrograph, which operates in the H-band infrared. This instrument provides high-resolution spectra (R ∼ 22,500) and allows for the derivation of detailed chemical abundances for over 22 species, including light elements, α- elements, iron-peak elements, and s-process elements. CAPOS has obtained high-quality data to study BGCs, employing advanced techniques to determine ages and kinematics with great precision. CAPOS I presented initial results from the ASCAP analysis, based on seven BGCs cataloged in SDSS DR16, deriving atmospheric parameters, radial velocities, and detailed abundances for up to 20 elements in 40 giant star members of these clusters. Key findings in CAPOS I include the correction of systematic correlations between metallicity and effective temperature, derivation of precise mean metallicities (ranging from [Fe/H] = −1.40 to −0.85), confirmation of slightly higher [Si/Fe] abundances in in situ main bulge clusters, clear identification of multiple populations (MPs) phenomena in each cluster, and exploration of iron-peak elements such as Mn and Ni. The project has made significant advances in characterizing specific clusters, including FSR 1758, Tonantzintla 2, NGC 6558, and HP 1. For HP 1, one of the oldest BGCs with an estimated age of 12.8 +0.9/−0.8 Gyr, abundances of Fe, C, N, O, Mg, Al, Si, S, Ca, Ti, Cr, Ni, and Ce were obtained for a sample of 10 red giant branch members using the BACCHUS package. A fundamental aspect of the study is the search for evidence of the multiple population phenomenon in HP 1 and other BGCs. The study of MPs in BGCs is crucial for understanding the formation and evolution of these ancient stellar structures and, by extension, the Galactic bulge as a whole. The complexity of this astrophysical phenomenon underscores the importance of projects like CAPOS in advancing our understanding of these fascinating objects.
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