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Bulge globular clusters: relics of the early formation of the galaxy

Grant number: 18/22044-3
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): March 01, 2019
Effective date (End): February 28, 2023
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal Investigator:Beatriz Leonor Silveira Barbuy
Grantee:Stefano Oliveira de Souza
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:14/18100-4 - Stellar populations in the Milky Way: bulge, halo, disk and star forming regions; instrumentation for high resolution spectroscopy, AP.TEM


The galactic bulge is the component of the milky way that is most controversial in terms of its formation process. The aim of this project is the study of globular clusters as tracers of the formation and evolution of the galactic bulge, by means of photometry, spectroscopy, and complemented with dynamical studies. High quality photometry as obtained with the Hubble Space Telescope (HST) and GEMS@Gemini allow to derive ages with good precision. Spectroscopic analyses will be carried out using different resolutions: R~45,000 with UVES@VLT and STELES@SOAR in the optical, R~70,000 with APOGEE@SDSS, medium R~22,000 with GIRAFFE@VLT, and low R~4,000 with other instruments. This is due mainly to the fact that we have perspectives to obtain such data, but also because the study of abundances with different resolutions will allow to use more distant and fainter objects, using the future large telescopes. Finally, having ages, metallicities and element abundances, combined withdistances, radial velocities, and proper motions (in particular from the Gaia satellite), we are able to compute their orbits, usinga galactic potential consistent with the observations. (AU)

Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
FERNANDEZ-TRINCADO, JOSE G.; MINNITI, DANTE; BEERS, TIMOTHY C.; VILLANOVA, SANDRO; GEISLER, DOUG; SOUZA, STEFANO O.; SMITH, LEIGH C.; PLACCO, VINICIUS M.; VIEIRA, KATHERINE; PEREZ-VILLEGAS, ANGELES; BARBUY, BEATRIZ; ALVES-BRITO, ALAN; MONI BIDIN, CHRISTIAN; ALONSO-GARCIA, JAVIER; TANG, BAITIAN; PALMA, TALI. The enigmatic globular cluster UKS 1 obscured by the bulge: H-band discovery of nitrogen-enhanced stars. Astronomy & Astrophysics, v. 643, NOV 17 2020. Web of Science Citations: 1.
OLIVEIRA, R. A. P.; SOUZA, S. O.; KERBER, L. O.; BARBUY, B.; ORTOLANI, S.; PIOTTO, G.; NARDIELLO, D.; PEREZ-VILLEGAS, A.; MAIA, F. F. S.; BICA, E.; CASSISI, S.; D'ANTONA, F.; LAGIOIA, E. P.; LIBRALATO, M.; MILONE, A. P.; ANDERSON, J.; APARICIO, A.; BEDIN, L. R.; BROWN, T. M.; KING, I. R.; MARINO, A. F.; PIETRINFERNI, A.; RENZINI, A.; SARAJEDINI, A.; VAN DER MAREL, R.; VESPERINI, E. The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of Single and Multiple Stellar Populations in Seven Bulge Globular Clusters. ASTROPHYSICAL JOURNAL, v. 891, n. 1 MAR 1 2020. Web of Science Citations: 0.
SOUZA, S. O.; KERBER, L. O.; BARBUY, B.; PEREZ-VILLEGAS, A.; OLIVEIRA, R. A. P.; NARDIELLO, D. Self-consistent Analysis of Stellar Clusters: An Application to HST Data of the Halo Globular Cluster NGC 6752. ASTROPHYSICAL JOURNAL, v. 890, n. 1 FEB 10 2020. Web of Science Citations: 1.
PEREZ-VILLEGAS, ANGELES; BARBUY, BEATRIZ; KERBER, LEANDRO O.; ORTOLANI, SERGIO; SOUZA, STEFANO O.; BICA, EDUARDO. Globular clusters in the inner Galaxy classified from dynamical orbital criteria. Monthly Notices of the Royal Astronomical Society, v. 491, n. 3, p. 3251-3265, JAN 2020. Web of Science Citations: 0.
ORTOLANI, S.; HELD, V, E.; NARDIELLO, D.; SOUZA, S. O.; BARBUY, B.; PEREZ-VILLEGAS, A.; CASSISI, S.; BICA, E.; MOMANY, Y.; SAVIANE, I. Another relic bulge globular cluster: ESO 456-SC38 (Djorgovski 2). Astronomy & Astrophysics, v. 627, JUL 16 2019. Web of Science Citations: 1.

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