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

4 Abril 2022, 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

4 Abril 2022, 08:30 • 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)

28 Março 2022, 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

Open Clusters in the Milky Way

28 Março 2022, 08:30 • André Maria da Silva Dias Moitinho de Almeida

- How open clusters (OCs) provided the first proof of the existence of an interstellar medium

- OC catalogues

- Characterisation of the OC sample

- OC view of Galactic structure

- OC view of Galactic dynamics

- OC view of Galactic evolution

- The Gaia space mission

Additional reading:

- Moitinho, A., 2010, “Observational properties of the open cluster system of the Milky Way and what they tell us about our Galaxy”. Proc IAU S266, 106-116. doi:10.1017/S1743921309990949

- Cantat-Gaudin, T., et. al, 2020, “Painting a portrait of the Galactic disc with its stellar clusters”. A&A, 640, A1. doi:10.1051/0004-6361/202038192

- Cantat-Gaudin, T., 2022, “Milky Way Star Clusters and Gaia: A Review of the Ongoing Revolution”. Universe, 8, 111. doi:10.3390/universe8020111

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

21 Março 2022, 11:00 • André Maria da Silva Dias Moitinho de Almeida

# Clusters parameter determination by eye

- Overlaying isochrone lines and cluster point clouds on photometric diagrams

- Trial and error fitting of distance, reddening and age on photometric diagrams