Search Publications
Sizing from the smallest scales: the mass of the Milky Way
Cooper, M. C.; Simon, J. D.; Ji, A. P. +6 more
As the Milky Way and its satellite system become more entrenched in near field cosmology efforts, the need for an accurate mass estimate of the Milky Way's dark matter halo is increasingly critical. With the second and early third data releases of stellar proper motions from Gaia, several groups calculated full 6D phase-space information for the p…
Asteroseismology of the double-radial mode δ Scuti star BP Pegasi
Daszyńska-Daszkiewicz, J.; Pamyatnykh, A. A.; Walczak, P. +1 more
Using the All-Sky Automated Survey data, we determine the pulsational frequencies of the high-amplitude δ Scuti star BP Pegasi. The analysis revealed only the two known, independent frequencies that we use to perform the seismic analysis of the star. On the basis of multicolour Strömgren photometry, we independently find that both frequencies can …
Globular Cluster UVIT Legacy Survey (GlobULeS) - I. FUV-optical colour-magnitude diagrams for eight globular clusters
Dalessandro, Emanuele; Hutchings, John; Stetson, Peter B. +22 more
We present the first results of eight globular clusters (GCs) from the AstroSat/UVIT Legacy Survey programme GlobULeS based on the observations carried out in two far-ultraviolet (FUV) filters (F148W and F169M). The FUV-optical and FUV-FUV colour-magnitude diagrams (CMDs) of GCs with the proper motion membership were constructed by combining the U…
Candidate isolated neutron stars in the 4XMM-DR10 catalogue of X-ray sources
Mereghetti, Sandro; Rigoselli, Michela; Tresoldi, Caterina
Most isolated neutron stars have been discovered thanks to the detection of their pulsed non-thermal emission, at wavelengths spanning from radio to gamma-rays. However, if the beamed non-thermal radiation does not intercept our line of sight or it is too faint or absent, isolated neutron stars can also be detected through their thermal emission, …
Multicomponent DHOST analysis in galaxy clusters
Umetsu, Keiichi; Salzano, Vincenzo; Laudato, Enrico
Extended theories of gravity with additional scalar degrees of freedom have recently acquired increasing interest due to the presence of a screening mechanism that allows suppressing at small scales (e.g. the Solar system scale) every modification restoring general relativity (GR). In this work, we consider a second-order extended theory of gravit…
7Be in the outburst of the ONe nova V6595 Sgr
Bonifacio, P.; Hernanz, M.; D'Odorico, V. +7 more
We report on the search for the 7Be II isotope in the outbursts of the classical nova V6595 Sgr by means of high-resolution Ultraviolet and Visual Echelle Spectrograph (UVES) observations taken at the European Southern Observatory's Very Large Telescope in 2021 April, about two weeks after its discovery and under difficult circumstances…
The formation of the Milky Way halo and its dwarf satellites: A NLTE-1D abundance analysis. V. The Sextans galaxy
Jablonka, P.; Yakovleva, S. A.; Belyaev, A. K. +3 more
We present a homogeneous set of accurate atmospheric parameters for a sample of eleven very metal-poor (-3.32 ≤ [Fe/H] ≤-2.61) stars in the Sextans dwarf spheroidal galaxy (dSph) and the non-local thermodynamic equilibrium (NLTE) abundances of, at least, seven chemical elements based on high-resolution UVES/VLT and HDS/Subaru spectra. For each sta…
The family pictures of our neighbours: investigating the mass function and dynamical parameters of nearby open clusters
Sollima, A.; Haghi, H.; Ebrahimi, H.
We determine the mass functions (MFs) and the dynamical parameters of 15 nearby open clusters (OCs), using the unprecedented data set of the Gaia Early Data Release 3. We select the members of each cluster by combining the photometric (colour and magnitude) and astrometric (parallax and proper motions) parameters of stars, minimizing the contamina…
Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
Wright, Jason T.; Zackrisson, Erik; Korn, Andreas J. +2 more
Dyson spheres are hypothetical megastructures built by advanced extraterrestrial civilizations to harvest radiation energy from stars. Here, we combine optical data from Gaia DR2 with mid-infrared data from AllWISE to set the strongest upper limits to date on the prevalence of partial Dyson spheres within the Milky Way, based on their expected was…
The stellar 'Snake' - I. Whole structure and properties
Fang, Min; Wang, Fan; Tian, Haijun +10 more
To complement our previous discovery of the young snake-like structure in the solar neighbourhood and reveal the structure's full extent, we build two samples of stars within the Snake and its surrounding territory from Gaia Early Data Release 3 (EDR3). With the friends-of-friends algorithm, we identify 2694 and 9052 Snake member candidates from t…