Zobrazeno 1 - 10
of 704
pro vyhledávání: '"Martocchia A"'
Autor:
Niederhofer, F., Bellini, A., Kozhurina-Platais, V., Libralato, M., Häberle, M., Kacharov, N., Kamann, S., Bastian, N., Cabrera-Ziri, I., Cioni, M. -R. L., Dresbach, F., Martocchia, S., Massari, D., Saracino, S.
We present proper motion (PM) measurements for a sample of 23 massive star clusters within the Large Magellanic Cloud using multi-epoch data from the Hubble Space Telescope (HST). We combined archival data from the ACS/WFC and WFC3/UVIS instruments w
Externí odkaz:
http://arxiv.org/abs/2406.17347
The importance of stellar rotation in setting the observed properties of young star clusters has become clearer over the past decade, with rotation being identified as the main cause of the observed extended main sequence turn-off (eMSTO) phenomenon
Externí odkaz:
http://arxiv.org/abs/2302.01348
Autor:
Cadelano, M., Dalessandro, E., Salaris, M., Bastian, N., Mucciarelli, A., Saracino, S., Martocchia, S., Cabrera-Ziri, I.
We present the result of a detailed analysis of HST UV and optical deep images of the massive and young (~1.5 Gyr) stellar cluster NGC 1783 in the Large Magellanic Cloud. This system does not show evidences of multiple populations (MPs) along the red
Externí odkaz:
http://arxiv.org/abs/2112.06964
Autor:
Martocchia, S., Lardo, C., Rejkuba, M., Kamann, S., Bastian, N., Larsen, S., Cabrera-Ziri, I., Chantereau, W., Dalessandro, E., Kacharov, N., Salaris, M.
We present ESO/VLT FORS2 low resolution spectroscopy of red giant branch stars in three massive, intermediate age ($\sim 1.7-2.3$ Gyr) star clusters in the Large Magellanic Cloud. We measure CH and CN index bands at 4300A, and 3883A, as well as [C/Fe
Externí odkaz:
http://arxiv.org/abs/2106.02054
Autor:
Martocchia, S., Kamann, S., Saracino, S., Usher, C., Bastian1, N., Rejkuba, M., Latour, M., Lardo, C., Cabrera-Ziri, I., Dreizler, S., Kacharov, N., Kozhurina-Platais, V., Larsen, S., Mancino, S., Platais, I., Salaris, M.
Ancient ($>$10 Gyr) globular clusters (GCs) show chemical abundance variations in the form of patterns among certain elements, e.g. N correlates with Na and anti-correlates with O. Recently, N abundance spreads have also been observed in massive star
Externí odkaz:
http://arxiv.org/abs/2009.10023
Autor:
Saracino, S., Kamann, S., Usher, C., Bastian, N., Martocchia, S., Lardo, C., Latour, M., Cabrera-Ziri, I., Dreizler, S., Giesers, B., Husser, T. -O., Kacharov, N., Salaris, M.
Nearly all of the well studied ancient globular clusters (GCs), in the Milky Way and in nearby galaxies, show star-to-star variations in specific elements (e.g., He, C, N, O, Na, Al), known as "multiple populations" (MPs). However, MPs are not restri
Externí odkaz:
http://arxiv.org/abs/2009.03320
Fornax 4 is the most distinctive globular cluster in the Fornax dwarf spheroidal. Located close to the centre of the galaxy, more metal-rich and potentially younger than its four companions (namely, Fornax clusters number 1, 2, 3 and 5), it has been
Externí odkaz:
http://arxiv.org/abs/2005.12352
Autor:
Cabrera-Ziri, I., Speagle, J. S., Dalessandro, E., Usher, C., Bastian, N. J., Salaris, M., Martocchia, S., Kozhurina-Platais, V., Niederhofer, F., Lardo, C., Larsen, S. S., Saracino, S.
The spectroscopic and photometric signals of the star-to-star abundance variations found in globular clusters seem to be correlated with global parameters like the cluster's metallicity, mass and age. Understanding this behaviour could bring us close
Externí odkaz:
http://arxiv.org/abs/2004.09636
Autor:
Bastian, Nate, Lardo, Carmela, Usher, Christopher, Kamann, Sebastian, Larsen, Soeren S., Cabrera-Ziri, Ivan, Chantereau, William, Martocchia, Silvia, Salaris, Maurizio, Asa'd, Randa, Hilker, Michael
Recent work has shown that the properties of multiple populations within massive stellar clusters (i.e., in the extent of their abundance variations as well as the fraction of stars that show the anomalous chemistry) depend on the mass as well as the
Externí odkaz:
http://arxiv.org/abs/2003.03428
Autor:
Saracino, S., Martocchia, S., Bastian, N., Kozhurina-Platais, V., Chantereau, W., Salaris, M., Cabrera-Ziri, I., Dalessandro, E., Kacharov, N., Lardo, C., Larsen, S. S., Platais, I.
Recent studies have revealed that the Multiple Populations (MPs) phenomenon does not occur only in ancient and massive Galactic globular clusters (GCs), but it is also observed in external galaxies, where GCs sample a wide age range with respect to t
Externí odkaz:
http://arxiv.org/abs/2003.01780