Photo by rawpixel on Unsplash

GALFOR

Photo by rawpixel on Unsplash

GALFOR

GALFOR is a project of Galactic archaeology (ERC-2016-STG, 716082) to address such hot topics of modern astrophysics. We will exploit the unique dataset that the Hubble Space Telescope and the major ground-based facilities have collected for us to investigate a huge number of Galactic and extra-Galactic star clusters and their stellar populations. GALFOR will study the star clusters that we observe today to shed light on the series of events that occurred at high redshift and led to the formation of the globular clusters and of their multiple populations.

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Giacomo Cordoni
Astronomy Ph.D. student

Publications

By exploiting recent work based on Gaia, half of the known Type II GCs appear clustered in a distinct region of the integral of motions space, thus suggesting a common progenitor galaxy. Except for these Type II GCs, we do not find any significant difference in the MPs between clusters associated with different progenitors.

Similarly to Galactic GCs, the RGB width of Magellanic Cloud (MC) GCs correlates with cluster mass after removing the dependence from metallicity. This fact demonstrates that cluster mass is the main factor affecting the properties of MPs.

We suggest that a small variation in metals and binarity governs the color spread of the 1G in the ChM and that evolved BSs contribute to the bluest tail of the 1G sequence.

A new economic combination of HST filter reveals the presence of four stellar populations with extreme Helium variations in the massive outer-halo globular cluster NGC2419.

Internal variation of helium content cannot reproduce all the observational constraints at the same time. The origin of the first generation colour spread is therefore still without a straightforward explanation.

New analysis of the HB branch reveals breaks the degeneracy on the horizontal branch. Second generation stars need to lose more mass than first generation stars