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Assigned ID: 7329
----- Attempting Submission 1 (Thu Apr 16 08:40:08 GMT 2026) -----
HST Phase I Proposal 7329 successfully submitted.
Receipt: # 7329-1
The SAME ORIENT AS constraint has been removed as for the TTRB request.
To optimize the observational strategy we have now opted for the UVIS-CENTER aperture and we have adopted a UVIS-GAP-LINE dither pattern with 3 steps to fill the gap.
-203316103
----- Attempting Submission 1 (Tue Aug 04 14:09:38 GMT 2026) -----
HST Phase II Proposal 18384 successfully submitted.
Receipt: # 18384-1
----- Attempting Submission 2 (Tue Aug 18 23:38:54 GMT 2026) -----
MUSYC: a Medium Uv deep Survey of Young massive Clusters in the Magellanic Clouds
Young massive clusters (YMCs) play a central role in many key research areas ranging from star and cluster formation to stellar evolution. However, their full potential as astrophysical benchmarks is admittedly hampered by the lack of deep UV observations.
Here we aim at filling this gap by performing MUSYC, the first deep UV survey of a representative sample of five YMCs younger than ~1.5 Gyr in the Magellanic Clouds. The requested data are a gold mine for a large number of interesting applications. Here we focus on the following science cases.
The first one is the search for multiple populations (MPs) with different light-element abundances along the lower main sequence of YMCs by using UV nitrogen-sensitive filters. This analysis will finally show whether MPs are common to all massive clusters (irrespective of their age), thus addressing one of the most important open questions in stellar population studies and enabling the definition of a complete picture about how MP properties evolve across the cosmic time.
Secondly, we will explore the nature and origin of the recently identified UV-dim stars, which have been suggested to be fast-rotators with circumstellar disks. This study would thus have a large impact on our understanding of the interplay between stellar rotation, mass-loss and disk formation, with direct implications on stellar evolution models.
Finally, the UV sensitivity of the requested data and the large temporal baseline with archival HST images will enable the first complete and homogeneous characterization of exotic objects in YMCs and the derivation of accurate proper motions for detailed internal and global kinematic analysis.
Deep WFC3/UVIS observations are requested to observe five young massive clusters in the Magellanic Clouds.
For all clusters, we will adopt the same observational strategy.
For each cluster 8 orbits will be dedicated to observations with the F343N filter (1 image per orbit), two orbits to obtain 6 images with F438W and two orbits to obtain 6 images with F275W. For NGC1866 we will not acquire F275W images.
Observations are split in 4 Visits containing 3 orbits each. For each cluster the first 2 Visits include 3 orbits to get F343N images. The last 2 include 1 orbit to acquire images for each requested filter. The UVIS-CENTER aperture and a WFC3-UVIS-GAP-LINE dither pattern with 3 steps and standard spacing are adopted for all filters.
Our team has extensive experience in the use of HST for the study of massive star clusters, including those in the Magellanic Clouds.
E. Dalessandro (PI) has a strong expertise with high-precision PSF photometry (using HST and ground-based adaptive optics) in crowded fields and in the study of multiple population photometric, structural and kinematic properties.
M. Salaris and S. Cassisi are worldwide recognized experts in stellar evolution models. They have published numerous papers on the multiple population phenomenon, making explicit predictions about how the colours of stars with different light-element abundances change in the different HST and JWST filters.
M. Cadelano, S. Martocchia, S. Saracino and F. Niederhofer have carried out a large number of projects on massive stellar clusters, including young massive clusters in the Magellanic Clouds, that required precise photometry and astrometry with HST. Their results are a reference in our understanding of the multiple population phenomenon in young stellar clusters.
E. Sabbi is an expert in young massive cluster formation and early evolution. She has a long experience in the use and optimization of HST observations for stellar cluster studies.
E. Vesperini is one of the main experts in stellar dynamics of clusters and development of N-body and Monte Carlo simulations specifically tailored for the study of cluster formation and evolution.
S. Kamann and S. Leanza have a long experience in the combination of HST catalogs with Integral Field Unit spectrographs for the characterization of massive stellar clusters and their multiple populations. They are also authors of pionering works on the charatcerization of UV-dim stars.
C. Lardo is an expert in the chemical characterization of multiple populations across the entire range of age and mass of the massive cluster population.
N. Bastian is among the main international experts in the study of multiple populations in massive stellar clusters and in the use and charaterization of young systems in the Magellanic Clouds.
A. Della Croce is author of recent significant works focussed on the use of stellar kinematics to study massive cluster formation and early evolution.
G. Ettorre research activity is mainly focussed on the study of exotic populations in stellar clusters. She has also significant experience in the comparison between CMDs of young massive clusters and models including the effects of stellar rotation.
E. Werre is a Master student visiting INAF OAS Bologna. Her research experience bridges computational cosmology and X-ray astronomy photometric analysis.
Stellar Populations and the Interstellar Medium
Stellar Physics and Stellar Types
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true
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