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What is a globular cluster? An observational perspective
D'Orazi, Valentina; Gratton, Raffaele; Bragaglia, Angela +3 more
Globular clusters are large and dense agglomerate of stars. At variance with smaller clusters of stars, they exhibit signs of some chemical evolution. At least for this reason, they are intermediate between open clusters and massive objects such as nuclear clusters or compact galaxies. While some facts are well established, the increasing amount o…
Pulsating white dwarfs: new insights
Kepler, S. O.; Córsico, Alejandro H.; Althaus, Leandro G. +1 more
Stars are extremely important astronomical objects that constitute the pillars on which the Universe is built, and as such, their study has gained increasing interest over the years. White dwarf stars are not the exception. Indeed, these stars constitute the final evolutionary stage for more than 95% of all stars. The Galactic population of white …
Solar wind charge exchange: an astrophysical nuisance
Kuntz, K. D.
Solar wind charge-exchange (SWCX) emission is present in every X-ray observation of an astrophysical object. The emission is problematic when one cannot remove the foreground by the simultaneous measurement of a nearby field. SWCX emission is a serious impediment to the study of the diffuse hot ISM, including the galactic halo, as its contribution…