Search Publications
Hubble Space Telescope survey of Magellanic Cloud star clusters. Binaries among the split main sequences of NGC 1818, NGC 1850, and NGC 2164
Milone, A. P.; Cordoni, G.; Marino, A. F. +15 more
Nearly all star clusters younger than ~600 Myr exhibit extended main sequence turnoffs and split main sequences (MSs) in their color-magnitude diagrams. Works based on both photometry and spectroscopy have clearly demonstrated that the red MS is composed of fast-rotating stars, whereas blue-MS stars are slow rotators. Nevertheless, the mechanism r…
Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO5BOLD RHD simulations
Chiavassa, A.; Uttenthaler, S.; Freytag, B. +2 more
Context. The complex dynamics of asymptotic giant branch (AGB) stars and the resulting stellar winds have a significant impact on the measurements of stellar parameters and amplify their uncertainties. Three-dimensional (3D) radiative hydrodynamic (RHD) simulations of convection suggest that convection-related structures at the surface of AGB star…
Physical properties of trans-Neptunian object (143707) 2003 UY117 derived from stellar occultation and photometric observations
Pallé, E.; Souami, D.; Alvarez-Candal, A. +49 more
Context. Trans-Neptunian objects (TNOs) are considered to be among the most primitive objects in our Solar System. Knowledge of their primary physical properties is essential for understanding their origin and the evolution of the outer Solar System. In this context, stellar occultations are a powerful and sensitive technique for studying these di…
Four new eclipsing accreting ultracompact white dwarf binaries found with the Zwicky Transient Facility
Drake, A. J.; Bloom, J. S.; Kulkarni, S. R. +10 more
Context. Accreting ultracompact white dwarf binaries contain a white dwarf that is accreting from a degenerate object. They have orbital periods shorter than 65 min.
Aims: We report the discovery and the orbital period of four new eclipsing accreting ultracompact white dwarf binaries found using the Zwicky Transient Facility (ZTF) and discuss…
Revisiting the local interstellar radiation field using Gaia DR3
Bianchi, S.
Context. Dust grains in the interstellar medium are heated by the integrated radiation from stars in the Milky Way. Thus, knowledge of the local interstellar radiation field (LISRF) is necessary to interpret observations of dust emission in the infrared and constrain (some) properties of interstellar grains. The LISRF representation that is most w…
An empirical isochrone archive for nearby open clusters
Meingast, Stefan; Rottensteiner, Alena
Context. The ages of star clusters and co-moving stellar groups contain essential information about the Milky Way. Their special properties and placement throughout the galactic disk make them excellent tracers of galactic structure and key components to unlocking its star formation history. Yet, even though the importance of stellar population ag…
Imaging the innermost circumstellar environment of the red supergiant WOH G64 in the Large Magellanic Cloud
van Loon, J. Th.; Weigelt, G.; Hofmann, K. -H. +3 more
Context. Significant mass loss in the red supergiant (RSG) phase has great influence on the evolution of massive stars and their final fate as supernovae. Aims. We present near-infrared interferometric imaging of the circumstellar environment of the dust-enshrouded RSG WOH G64 in the Large Magellanic Cloud. Methods. WOH G64 was observed with the G…
The high-energy environment of the heavy sub-Earth GJ 367 b indicates likely complete evaporation of its atmosphere
Schmitt, J. H. M. M.; Robrade, J.; Schneider, P. C. +5 more
The planet GJ 367 b is a recently discovered high-density sub-Earth orbiting an M dwarf star. Its composition was modelled to be predominantly iron with a potential remainder of a hydrogen-helium envelope. Here we report an X-ray detection of this planet's host star for the first time, using data from the spectro-imaging X-ray telescope eROSITA on…
The HST Large Programme on ω Centauri. VI. The radial gradient of the stellar populations
Vesperini, E.; Scalco, M.; Bedin, L.
In this paper we present the analysis of Hubble Space Telescope (HST) observations of the globular cluster Omega Centauri. Our analysis combines data obtained in this work with previously published HST data from an earlier article of this series and encompasses a broad portion of the cluster's radial extension. Our findings reveal a significant ra…
Observed kinematics of the Milky Way nuclear stellar disk region
Zoccali, M.; Rojas-Arriagada, A.; Valenti, E. +3 more
Context. The nuclear region of the Milky Way, within approximately −1° < l < +1° and −0.3° < b < +0.3° (i.e., |l|< 150 pc, |b|< 45 pc), is believed to host a nuclear stellar disk, co-spatial with the gaseous central molecular zone. Previous kinematical studies detected faster rotation for the stars belonging to the nuclear stella…