Solving the TP-AGB STAR Conundrum: a KEY to Galaxy Evolution

The impact of the Thermally Pulsing Asymptotic Giant Branch (TP-AGB) stellar evolutionary phase is widespread across astrophysics, impinging on a plethora of aspects, from the chemical composition of meteorites belonging to the pre-solar nebula up to the derivation of galaxy's properties in the high-redshift Universe.
In spite of its importance, the modelling of TP-AGB is still affected by large uncertainties that propagate into the field of extragalactic astronomy, degrading the predicting power of current population synthesis models of galaxies.

 

The major goal of the STARKEY project is to remedy this persistent condition of uncertainty and controversy. The solution to the TP-AGB star conundrum will be provided by a new approach, which stands on the optimised integration of a) state-of-the-art theoretical tools to account for the complex physics of TP-AGB stars (evolution, nucleosynthesis, pulsation, winds, dust formation, etc.), and b) exceptionally high-quality observations of resolved TP-AGB stellar populations in stars clusters and nearby galaxies (Magellanic Clouds, M31, M33, dwarf galaxies) with reliable measurements of their star formation histories.

The STARKEY project adopts a global calibration method, in which TP-AGB evolution models are required to simultaneously reproduce a set of well-defined observational constraints (star counts, distributions of luminosities, colours, pulsation periods, dust mass-loss rates, expansion velocities of dusty envelopes, etc.).

STARKEY aims to provide the community with wide-spread deliverables. We will publicly release well-tested "TP-AGB products", including stellar tracks, libraries of stellar spectra (both static and dynamic), isochrones in all photometric systems, and chemical yields for both gas and dust. Eventually these products will be embedded in the stellar population synthesis models that are routinely used to analyse the integrated galaxy observables that probe the extragalactic Universe.

Portrait

3rd STARKEY meeting (April 19-21, 2017)

Department of Physics and Astronomy
University of Padova
Vicolo dell’Osservatorio 3
Astronomical Observatory Padova, INAF
Vicolo dell’Osservatorio 5
PADOVA

 

Click here to download the meeting agenda.

 

Objectives:

1. Review purpose of the project
2. Promote collaborations and exchanges
3. Identify challenges to goal
4. Plan next steps

Participants:

 

Bernhard Aringer, Sara Bladh, Alessandro Bressan, Yang Chen, Julianne Dalcanton,
Marco Dussin, Leo Girardi, M.A.T. Groenewegen, Susanne Höfner, Josef Hron,
Sofie Liljegren, Paola Marigo, Iain McDonald, Josefina Montalban, Ambra Nanni,
Giada Pastorelli, Phil Rosenfield, Stefano Rubele, Michele Trabucchi, Jacco van Loon,
Patricia Whitelock, Peter Wood

 

Wed 19/04/2017 (Sala Jappelli, Observatory)

Dedicated to short (10-15min) overviews of the work done in Padova since the last meeting:
9:00 – 9:05 Welcome by Paola Marigo
WP1: Stellar Tracks
9:05 – 9:35 Stellar Tracks and Isochrones
(Paola Marigo, Leo Girardi)
WP2: Pulsation
9:35 – 10:10 Pulsation Models
(Josefina Montalban, Michele Trabucchi)
WP3: Stellar Atmospheres & Winds
10:10 – 10:30 Static Model Atmospheres
(Bernhard Aringer)
10:30 – 11:00 Coffee Break
11:00 – 11:20 Dynamic Model Atmospheres & Winds
(Sara Bladh)
WP4: Dust Formation and Radiative Transfer
11:20 – 11:50 Wind Models & The Magellanic Clouds
(Ambra Nanni)
11:50 – 12:30 Joint Discussion on WP1-WP4
12:30 – 14:30 Lunch
WP5: Population Synthesis and the Calibration Set
14:30 – 16:00 Population Synthesis & Observations of Star Clusters and Galaxies
(Leo Girardi, Yang Chen, Giada Pastorelli, Stefano Rubele)
16:00 – 16:30 Coffee Break
16:30 – 18:30 Discussion of the Different WP Groups

 

Thu 20/04/2017 (Sala Jappelli, Observatory)

Dedicated to short (10-15min) presentations from our guests concerning their work
and its link to STARKEY:
9:00 – 9:25
Patricia Whitelock (South African Astronomical Observatory)
Infrared colours of HBB stars
9:25 – 9:50
Peter Wood (Australian National Observatory)
The evolution of binary red giants in the LMC
9:50 – 10:15
Sofie Liljegren (Uppsala Univ.)
Pulsation-induced atmospheric dynamics in M-type AGB stars
10:15 – 10:40
Josef Hron (Vienna Univ.)
Isotopic ratios derived from IR spectra
10:40 – 11:10 Coffee Break
11:10 – 11:35
Martin Groenewegen (Royal Observatory of Belgium)
Fluffy grains
11:35 – 12:30
Joint Discussion on WP1-WP5
12:30 – 14:30 Lunch
14:30 – 14:55
Iain McDonald (University of Manchester)
Working towards better empirical calibration of the mass-loss prescription for AGB stars
14:55 – 15:20
Phil Rosenfield (Harvard-Smithsonian Center for Astrophysics, Cambridge)
Constraining Convective Core Overshooting using LMC Clusters
15:20 – 16:00
Joint Discussion on WP1-WP5

16:00 – 16:30 Coffee Break
16:30 – 18:30 Discussion of the Different WP Groups

 

20:00 Spritz in Padova and Social Dinner

 

Fri 21/04/2017 (Sala Jappelli, Observatory/Sala Riunioni, Department)

Dedicated to discussion of ongoing & future projects and publications:
9:00 – 10:30 Discussion of the Different WP Groups
10:30 – 11:00 Coffee Break
11:00 – 12:30 Discussion of the Different WP Groups
12:30 – 14:30 Lunch
14:30 – 16:00 Discussion of the Different WP Groups
16:00 – 16:30 Coffee Break
16:30 – 18:30 Discussion of the Different WP Groups

Portrait

2nd STARKEY meeting (April 20-22, 2016)

Department of Physics and Astronomy
University of Padova
Vicolo dell’Osservatorio 3
Astronomical Observatory Padova, INAF
Vicolo dell’Osservatorio 5
PADOVA

 

Click here to download the meeting agenda.

 

Objectives:

1. Review purpose of the project
2. Promote collaborations and exchanges
3. Identify challenges to goal
4. Plan next steps

Participants:

 

Bernhard Aringer, Sara Bladh, Alessandro Bressan, Yang Chen, Marco Dussin,

Leo Girardi, M.A.T. Groenewegen, Susanne Hoefner, Sofie Liljegren,

Paola Marigo, Marko Mecina, Josefina Montalban, Ambra Nanni, Giada Pastorelli,

Gioia Rau, Stefano Rubele, Michele Trabucchi, Peter Wood

 

Wed 20/04/2016 (Sala Jappelli, Observatory)

Dedicated to short (10-15min) overviews of the work done in Padova since the last meeting:
9:00 – 9:05 Welcome by Paola Marigo
WP1: Stellar Tracks
9:05 – 9:35 Stellar Tracks and Isochrones
(Paola Marigo, Leo Girardi)
WP2: Pulsation
9:35 – 10:10 Pulsation Models
(Josefina Montalban, Michele Trabucchi)
WP3: Stellar Atmospheres & Winds
10:10 – 10:30 Static Model Atmospheres
(Bernhard Aringer)
10:30 – 11:00 Coffee Break
11:00 – 11:20 Dynamic Model Atmospheres & Winds
(Sara Bladh)
WP4: Dust Formation and Radiative Transfer
11:20 – 11:50 Wind Models & The Magellanic Clouds
(Ambra Nanni)
11:50 – 12:30 Joint Discussion on WP1-WP4
12:30 – 14:30 Lunch
WP5: Population Synthesis and the Calibration Set
14:30 – 16:00 Population Synthesis & Observations of Star Clusters and Galaxies
(Leo Girardi, Yang Chen, Giada Pastorelli, Stefano Rubele)
16:00 – 16:30 Coffee Break
16:30 – 18:30 Discussion of the Different WP Groups

 

Thu 21/04/2016 (Sala Jappelli, Observatory)

Dedicated to short (10-15min) presentations from our guests concerning their work

and its link to STARKEY:

9:00 – 9:30 Gioia Rau (Vienna), Interferometry, Stellar Parameters

9:30 – 10:00 Marko Mecina (Vienna), Shells around Carbon Stars

10:00 – 10:30 Sofie Liljegren (Uppsala), Pulsation & Winds

10:30 – 11:00 Coffee Break

11:00 – 11:30 Susanne Hoefner (Uppsala), New Developments of Dynamical Models

11:30 – 12:00 Martin Groenewegen (Brussels), Mass Loss

12:00 – 12:30 Joint Discussion on WP1-WP5

12:30 – 14:30 Lunch

14:30 – 15:00 Peter Wood (Australian National Obs.), Pulsation, etc...

15:00 – 16:00 Joint Discussion on WP1-WP5

16:00 – 16:30 Coffee Break

16:30 – 18:30 Discussion of the Different WP Groups

 

 

Fri 22/04/2016 (Sala Jappelli, Observatory/Sala Riunioni, Department)

Dedicated to discussion of ongoing & future projects and publications:
9:00 – 10:30 Discussion of the Different WP Groups
10:30 – 11:00 Coffee Break
11:00 – 12:30 Discussion of the Different WP Groups
12:30 – 14:30 Lunch
14:30 – 16:00 Discussion of the Different WP Groups
16:00 – 16:30 Coffee Break
16:30 – 18:30 Discussion of the Different WP Groups

 

 

 

Portrait

1st STARKEY Meeting, Padova, April 22-24 2015

Starkey Meeting poster

Participants:

  • Bernhard Aringer,
  • Sara Bladh,
  • Martha Boyer,
  • Alessandro Bressan,
  • Yang Chen,
  • Julianne Dalcanton,
  • Marco Dussin,
  • Leo Girardi,
  • M. A. T. Groenewegen,
  • Susanne Hoefner,
  • Thomas Lebzelter,
  • Paola Marigo,
  • Josefina Montalban,
  • Ambra Nanni,
  • Christine Nicholls,
  • Sofia Ramstedt,
  • Emanuele Ripamonti,
  • MicheleTrabucchi,
  • Peter Wood.

Click here to download the meeting agenda.