Processos radiativos em Astrofísica e a Distribuição Espectral de Energia de Galáxias

4 Abril 2023, 11:00 • André Maria da Silva Dias Moitinho de Almeida

Processos radiativos em Astrofísica e a Distribuição Espectral de Energia de Galáxias

4 Abril 2023, 09:00 • André Maria da Silva Dias Moitinho de Almeida

Analysing resolved stellar populations using Gaia data and theoretical models (V)

28 Março 2023, 11:00 • André Maria da Silva Dias Moitinho de Almeida

# Clusters parameter determination - going further (II)

- Using parallaxes to constrain distance

- Maximum likelihood distance from parallax

- Dicussion the differences between the various distance estimates made

- Discuss extension of maximum likelihood fit to all parameters

Stellar populations in the Galactic halo and resolved galaxies

28 Março 2023, 09:00 • André Maria da Silva Dias Moitinho de Almeida

- In-depth analysis of the Gaia HRDs and kinematics of the Milky Way halo, globular clusters and  satellite dwarf galaxies

- kinematic identification of stellar groups (proper motions and invariants of motions)

- The Gaia-Sausage/ Gaia-Enceladus collision event

- Modelling complex stellar populations: The Milky Way and beyond

Additional reading:

- Chap 4 - Greggio & Renzini

- Chap 10 - Salaris & Cassis

- Gaia Collaboration, “Gaia Data Release 2 Observational Hertzsprung-Russell diagrams”, A&A 616, A10 (2018) https://doi.org/10.1051/0004-6361/201832843

- Gallart et al., “The birth of the Milky Way as uncovered by accurate stellar ages with Gaia”, Nature Astronomy, 3, 932 (2019) https://doi.org/10.1038/s41550-019-0829-5

- Gaia Collaboration, "Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way", A&A 616, A12 (2018) https://doi.org/10.1051/0004-6361/201832698

Analysing resolved stellar populations using Gaia data and theoretical models (IV)

21 Março 2023, 11:00 • André Maria da Silva Dias Moitinho de Almeida

# Clusters parameter determination - going further (I)

- Using parallaxes to constrain distance

- compare using average parallax or average of distances

- refit isochrones using distance from parallax