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Stellar populations in the Milky Way: bulge, halo, disk and star forming regions; instrumentation for high resolution spectroscopy

Grant number: 14/18100-4
Support Opportunities:Research Projects - Thematic Grants
Duration: February 01, 2016 - July 31, 2023
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal Investigator:Beatriz Leonor Silveira Barbuy
Grantee:Beatriz Leonor Silveira Barbuy
Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Pesquisadores principais:
Silvia Cristina Fernandes Rossi
Associated researchers:Alan Alves Brito ; Annibal Hetem Junior ; Bruno Vaz Castilho de Souza ; Charles Jose Bonato ; Clemens Darvin Gneiding ; Elisabetta Caffau ; Evelyne Alecian ; François Spite ; Jane Cristina Gregorio-Hetem ; Jorge Luis Melendez Moreno ; Leandro de Oliveira Kerber ; Martin Asplund ; Misha Haywood ; Monique Spite ; Paola Di Matteo ; Piercarlo Bonifacio ; Sergio Ortolani ; Silvia Cristina Fernandes Rossi ; Vanessa Bawden de Paula Macanhan ; Vinicius Moris Placco
Associated grant(s):18/05866-0 - XXXth IAU General Assembly of the International Astronomical Union, AR.EXT
16/24814-5 - Star clusters as tracers of formation and evolution of the Galactic bulge and Magellanic Clouds: modeling of data from the Hubble Space Telescope, SOAR, Gemini and Very Large Telescope, AV.BR
16/24313-6 - Chemodynamical evolution of the galactic bulge: review article for the Annual Review of Astronomy & Astrophysics, AV.EXT
Associated scholarship(s):22/09374-0 - Characterization of the young star cluster associated with FZ CMa, BP.DD
22/00516-6 - Star clusters as tools to study the formation and evolution of galaxies, BP.PD
20/14944-4 - Calibrations of the CUBES spectrograph, BP.IC
+ associated scholarships 20/13315-3 - Study of the galactic nuclei of the milky way morphological twins and SAbcs of the DIVING3D survey, BP.PD
19/25062-5 - Searching for peculiar features in the gas around young stellar clusters, BP.MS
18/22044-3 - Bulge globular clusters: relics of the early formation of the galaxy, BP.DD
18/22181-0 - Age and metallicity gradients of stellar clusters in the Magellanic Bridge, BP.DR
18/05535-3 - The study of the Magellanic Clouds and its link with the Milky Way is the objective of this project, including in particular the formation and dissolution of globular clusters., BP.PD
17/15893-1 - Globular cluster orbits of bulge: the formation and evolution of the Milky Way, BP.PD
16/20566-7 - Colour-magnitude diagrams of globular clusters with ultraviolet filters of the Hubble Space Telescope, BP.IC - associated scholarships


The main aim of this project is to study the stellar populations and structure of the Milky Way, in order to better understand its formation and evolution. The targets are stars of the Galactic Bulge, Halo and Disk. The bulge is studied in terms of the chemical composition of individual stars, as well as kinematics and ages of field and globular cluster stars. The interplay between the bar and the oldest globular clusters trapped in the bar is studied by deriving their proper motions and distance. The final goal is to know if the metal-poor stars in the bulge are the oldest in the Galaxy, as this would confirm that the bulge formed first. The Galactic halo is studied through the most metal-poor stars, by carrying out abundance analysis. A selection of new targets, in particular carbon-rich metal-poor stars, is also carried out based on large surveys (Sloan Digital Sky Survey and Hamburg/ESO survey). For both the halo and bulge, the abundance pattern of the metal-poor stars ([Fe/H]=-1.0 in the bulge, and [Fe/H] < -2.0 in the halo) give information on the nature of the first supernovae, that produced the chemical enrichment of the gas from which these stars formed. The Galactic disk is studied through a) old super metal-rich stars that seem to have migrated from the inner parts of the Galaxy; b) metal-rich M dwarfs; c) young stars and star forming regions. The group is expert in spectroscopy of cool stars, using low-resolution spectroscopy for selecting targets, and high spectral resolution for abundance analysis and radial velocity derivation. On the theoretical side, we select atomic and molecular data, including computation of hyperfine structure, and molecular constants, and produce line lists that are checked by comparison with spectra of well-known stars such as the Sun and Arcturus. For this, we use model atmospheres to compute synthetic spectra that are compared with the observed ones. We also produce composite spectra of integrated stellar populations, and intend to use integral field spectroscopy. In the study of star clusters, we also use imaging in optical and near-infrared colors, to produce colour-magnitude diagrams, and deduce their ages. For star forming regions, X-ray data from the satellites XMM-Newton and Chandra have been obtained, in order to identify young stars. Instrumentation is an important part of this project, with mainly the development of the CUBES spectrograph for the VLT/ESO, but also the ECHARPE spectrograph for the OPD/LNA/MCTI, and the MOSAIC multi-object spectrograph for the E-ELT. The CUBES spectrograph is at a stage that needs Research & Development on the ultraviolet properties of new CCD detectors, and on new gratings appropriate to the ultraviolet. These studies are useful for any present/future instrument in the ultraviolet. The MOSAIC spectrograph involves Brazilian expertise on optical fibers. (AU)

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Scientific publications (23)
(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)
REGGIANI, HENRIQUE; MELENDEZ, JORGE. Evidences of extragalactic origin and planet engulfment in the metal-poor twin pair HD 134439/HD 134440. Monthly Notices of the Royal Astronomical Society, v. 475, n. 3, p. 3502-3510, . (12/24392-2, 14/18100-4)
GREGORIO-HETEM, J.; NAVARETE, F.; HETEM, A.; SANTOS-SILVA, T.; GALLI, P. A. B.; FERNANDES, B.; MONTMERLE, T.; JATENCO-PEREIRA, V; FERNANDES, M. BORGES; PEROTTONI, H. D.; et al. Searching for Active Low-mass Stars in the CMa Star-forming Region: Multi-band Photometry with T80S. ASTRONOMICAL JOURNAL, v. 161, n. 3, . (18/06822-6, 14/18100-4, 18/21250-9, 17/19458-8, 17/18191-8, 18/05866-0)
CARLOS, M.; MELENDEZ, J.; SPINA, L.; DOS SANTOS, L. A.; BEDELL, M.; RAMIREZ, I.; ASPLUND, M.; BEAN, J. L.; YONG, D.; YANA GALARZA, J.; et al. The Li-age correlation: the Sun is unusually Li deficient for its age. Monthly Notices of the Royal Astronomical Society, v. 485, n. 3, p. 4052-4059, . (14/18100-4, 18/04055-8)
LIMBERG, GUILHERME; ROSSI, SILVIA; BEERS, TIMOTHY C.; PEROTTONI, HELIO D.; PEREZ-VILLEGAS, ANGELES; SANTUCCI, RAFAEL M.; ABUCHAIM, YURI; PLACCO, VINICIUS M.; LEE, YOUNG SUN; CHRISTLIEB, NORBERT; et al. Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys. ASTROPHYSICAL JOURNAL, v. 907, n. 1, . (17/15893-1, 14/18100-4, 18/21250-9, 15/50374-0)
FISHLOCK, C. K.; YONG, D.; KARAKAS, A. I.; ALVES-BRITO, A.; MELENDEZ, J.; NISSEN, P. E.; KOBAYASHI, C.; CASEY, A. R.. Sc and neutron-capture abundances in Galactic low- and high-alpha field halo stars. Monthly Notices of the Royal Astronomical Society, v. 466, n. 4, p. 4672-4682, . (12/24392-2, 14/18100-4)
CARLOS, MARILIA; MELENDEZ, JORGE; DO NASCIMENTO, JR., JOSE-DIAS; CASTRO, MATTHIEU. Li abundances for solar twins in the open cluster M67. Monthly Notices of the Royal Astronomical Society, v. 492, n. 1, p. 245-249, . (14/18100-4, 18/04055-8)
FERNANDES, B.; MONTMERLE, T.; SANTOS-SILVA, T.; GREGORIO-HETEM, J.. Runaways and shells around the CMa OB1 association. Astronomy & Astrophysics, v. 628, . (14/18100-4)
BENSBY, T.; GOULD, A.; ASPLUND, M.; FELTZING, S.; MELENDEZ, J.; JOHNSON, J. A.; LUCATELLO, S.; UDALSKI, A.; YEE, J. C.. hemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant star. Astronomy & Astrophysics, v. 655, . (14/18100-4)
PEROTTONI, HELIO D.; AMARANTE, JOAO A. S.; LIMBERG, GUILHERME; ROCHA-PINTO, HELIO J.; ROSSI, SILVIA; ANDERS, FRIEDRICH; BORBOLATO, LAIS. Searching for Extragalactic Exoplanetary Systems: The Curious Case of BD+20 2457. Astrophysical Journal Letters, v. 913, n. 1, . (14/18100-4, 15/50374-0, 18/21250-9)
BENSBY, T.; FELTZING, S.; GOULD, A.; YEE, J. C.; JOHNSON, J. A.; ASPLUND, M.; MELENDEZ, J.; LUCATELLO, S.; HOWES, L. M.; MCWILLIAM, A.; et al. Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars VI. Age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way. Astronomy & Astrophysics, v. 605, . (14/18100-4)
SANTOS-SILVA, T.; GREGORIO-HETEM, J.; MONTMERLE, T.; FERNANDES, B.; STELZER, B.. Star formation history of Canis Major OB1 II. A bimodal X-ray population revealed by XMM-Newton. Astronomy & Astrophysics, v. 609, . (10/50930-6, 14/18100-4)
REGGIANI, HENRIQUE; MELENDEZ, JORGE; KOBAYASHI, CHIAKI; KARAKAS, AMANDA; PLACCO, VINICIUS. Constraining cosmic scatter in the Galactic halo through a differential analysis of metal-poor stars. Astronomy & Astrophysics, v. 608, . (12/24392-2, 14/18100-4)
LIMBERG, GUILHERME; SANTUCCI, RAFAEL M.; ROSSI, SILVIA; QUEIROZ, ANNA B. A.; CHIAPPINI, CRISTINA; SOUZA, STEFANO O.; PEROTTONI, HELIO D.; PEREZ-VILLEGAS, ANGELES; BARBOSA, FABRICIA O.. Abundance Patterns of alpha and Neutron-capture Elements in the Helmi Stream. Astrophysical Journal Letters, v. 913, n. 2, . (18/21250-9, 14/18100-4, 15/50374-0, 18/22044-3)
SANTOS-SILVA, T.; PEROTTONI, H. D.; ALMEIDA-FERNANDES, F.; GREGORIO-HETEM, J.; JATENCO-PEREIRA, V; MENDES DE OLIVEIRA, C.; MONTMERLE, T.; BICA, E.; BONATTO, C.; MONTEIRO, H.; et al. Canis Major OB1 stellar group contents revealed by Gaia. Monthly Notices of the Royal Astronomical Society, v. 508, n. 1, p. 1033-1055, . (18/20977-2, 14/18100-4, 18/21250-9, 15/24946-6, 18/06822-6)
GREGORIO-HETEM, J.; LEFLOCH, B.; HETEM, A.; MONTMERLE, T.; FERNANDES, B.; MENDOZA, E. F.; DE SIMONE, M.. Comparing the spatial and kinematic distribution of gas and young stars around the shell-like structure in the CMa OB1 association. Astronomy & Astrophysics, v. 654, . (14/22095-6, 17/19458-8, 14/18100-4)
EZZEDDINE, RANA; RASMUSSEN, KAITLIN; FREBEL, ANNA; CHITI, ANIRUDH; HINOJISA, KARINA; PLACCO, VINICIUS M.; JI, ALEXANDER P.; BEERS, TIMOTHY C.; HANSEN, TERESE T.; ROEDERER, IAN U.; et al. TheR-Process Alliance: First Magellan/MIKE Release from the Southern Search forR-process-enhanced Stars{*}. ASTROPHYSICAL JOURNAL, v. 898, n. 2, . (14/18100-4)
BENSBY, T.; FELTZING, S.; YEE, J. C.; JOHNSON, J. A.; GOULD, A.; ASPLUND, M.; MELENDEZ, J.; LUCATELLO, S.. Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars VII. Lithium. Astronomy & Astrophysics, v. 634, . (14/18100-4)
LIMBERG, GUILHERME; SANTUCCI, RAFAEL M.; ROSSI, SILVIA; SHANK, DEREK; PLACCO, VINICIUS M.; BEERS, TIMOTHY C.; SCHLAUFMAN, KEVIN C.; CASEY, ANDREW R.; PEROTTONI, HELIO D.; LEE, YOUNG SUN. Targeting Bright Metal-poor Stars in the Disk and Halo Systems of the Galaxy. ASTROPHYSICAL JOURNAL, v. 913, n. 1, . (14/18100-4, 15/50374-0, 18/21250-9)
REGGIANI, HENRIQUE; AMARSI, ANISH M.; LIND, KARIN; BARKLEM, PAUL S.; ZATSARINNY, OLEG; BARTSCHAT, KLAUS; FURSA, V, DMITRY; BRAY, IGOR; SPINA, LORENZO; MELENDEZ, JORGE. Non-LTE analysis of K I in late-type stars. Astronomy & Astrophysics, v. 627, . (14/18100-4, 18/04055-8)
CARLOS, MARILIA; KARAKAS, AMANDA I.; COHEN, JUDITH G.; KOBAYASHI, CHIAKI; MELENDEZ, JORGE. A Formation Timescale of the Galactic Halo from Mg Isotopes in Dwarf Stars. ASTROPHYSICAL JOURNAL, v. 856, n. 2, . (12/24392-2, 14/18100-4)
HETEM, ANNIBAL; GREGORIO-HETEM, JANE. Fractal statistics in young star clusters: structural parameters and dynamical evolution. Monthly Notices of the Royal Astronomical Society, v. 490, n. 2, p. 2521-2541, . (18/05866-0, 14/18100-4, 17/19458-8)
MOURA, T. C.; TREVISAN, M.; BARBUY, B.; ROSSI, S.. Integrated Spectra of Milky Way Globular Clusters. ASTROPHYSICAL JOURNAL, v. 885, n. 1, . (18/03480-7, 14/18100-4, 15/50374-0)
CAIN, MADELYN; FREBEL, ANNA; GULL, MAUDE; JI, ALEXANDER P.; PLACCO, VINICIUS M.; BEERS, TIMOTHY C.; MELENDEZ, JORGE; EZZEDDINE, RANA; CASEY, ANDREW R.; HANSEN, TERESE T.; et al. The R-Process Alliance: Chemical Abundances for a Trio of r-process-enhanced Stars-One Strong, One Moderate, and One Mild. ASTROPHYSICAL JOURNAL, v. 864, n. 1, . (14/18100-4, 12/24392-2)

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