Search Publications
Variability and stellar pulsation incidence in Am and Fm stars using TESS and Gaia data
Niemczura, E.; Smalley, B.; Antoci, V. +3 more
Aims. We aim to study chemically peculiar Am and Fm stars, distinguished by their unique abundance patterns, which are crucial for studying mixing processes in intermediate-mass stars. These stars provide a window into the atomic diffusion in their stellar envelopes, the evolution-dependent changes in mixing, and the resulting effects on pulsation…
Discovery of the Goat Horn complex: a ∼1000 deg2 diffuse X-ray source connected to radio loop XII
Maitra, Chandreyee; Sasaki, Manami; Haberl, Frank +7 more
A dozen patches of polarized radio emission spanning tens of degrees in the form of coherent and stationary arcs and loops are observed at radio frequencies across the sky. Their origin is usually associated with nearby shocks, possibly arising from nearby supernova explosions. The origin of radio loop XII remains unknown. We report an anticorrela…
Mass density profiles at kiloparsec scales using the sub-millimetre galaxies magnification bias
Bonavera, L.; González-Nuevo, J.; Cueli, M. M. +2 more
Context. Gravitational lensing is a powerful tool for studying the distribution of mass in the Universe. Understanding the magnification bias effect in gravitational lensing and its impact on the flux of sub-millimetre galaxies (SMGs) is crucial for accurate interpretations of observational data.
Aims: This study aims to investigate the magni…
Thermally emitting isolated neutron star candidates from the SRG/eROSITA All-Sky Survey
Haberl, F.; Pires, A. M.; Schwope, A. D. +1 more
The SRG/eROSITA All-Sky Survey (eRASS) allows for the creation of a complete sample of X-ray dim isolated neutron stars (XDINSs), which will significantly facilitate the study of their population properties, evolution, and connection to other families of isolated neutron stars (INSs). In this work, we conduct a systematic search for XDINSs on the …
Projection factor and radii of Type II Cepheids: BL Her stars
Kervella, P.; Chini, R.; Storm, J. +14 more
Context. Type II Cepheids are old pulsating stars that can be used to trace the distribution of an old stellar population and to measure distances to globular clusters and galaxies within several megaparsecs, and by extension, they can improve our understanding of the cosmic distance scale. One method that can be used to measure the distances of T…
A magnetic reconnection model for the hot explosion with both ultraviolet and Hα wing emissions
Cheng, Guanchong; Ni, Lei; Chen, Yajie +1 more
Context. Ellerman bombs (EBs) with significant Hα wing emissions and ultraviolet bursts (UV bursts) with strong Si IV emissions are two kinds of small transient brightening events that occur in the low solar atmosphere. The statistical observational results indicate that about 20% of the UV bursts connect with EBs. While some promising models exis…
Discovery of the first olivine-dominated A-type asteroid family
Galluccio, L.; Delbo, M.; Avdellidou, C. +1 more
The classical theory of differentiation states that due to the heat generated by the decay of radioactive elements, some asteroids form an iron core, an olivine-rich mantle, and a crust. The collisional breakup of these differentiated bodies is expected to lead to exposed mantle fragments, creating families of newly-formed asteroids. Among these n…
New ACV variables discovered in the Zwicky Transient Facility survey
Paunzen, E.; Prišegen, M.; Piecka, M. +8 more
Context. The manifestation of surface spots on magnetic chemically peculiar (mCP) stars is most commonly explained by the atomic diffusion theory, which requires a calm stellar atmosphere and only moderate rotation. While very successful and well described, this theory still needs to be revised and fine-tuned to the observations.
Aims: Our st…
Catalogue of dual-field interferometric binary calibrators
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +96 more
Context. Dual-field interferometric observations with VLTI/GRAVITY sometimes require the use of a binary calibrator. This is a binary star whose individual components remain unresolved by the interferometer, with a separation between 400 and 2000 mas for observations with the Unit Telescopes (UTs), or 1200-3000 mas for the Auxiliary Telescopes (AT…
Gas-phase metallicity for the Seyfert galaxy NGC 7130
Lehmer, B. D.; Marconi, A.; Knapen, J. H. +2 more
Metallicity measurements in galaxies can provide valuable clues about galaxy evolution. One of the mechanisms postulated for metallicity redistribution in galaxies is gas flows induced by active galactic nuclei (AGNs), but the details of this process remain elusive. We report the discovery of a positive radial gradient in the gas-phase metallicity…