Context. Metal-poor stars play a crucial role in understanding the nature and evolution of the first stellar generation in the Galaxy. Previously, asteroseismic characterisation of red-giant stars has relied on constraints from the global asteroseismic parameters and not the full spectrum of individual oscillation modes. Using the latter, we

We present the first measurement of cosmic-ray fluxes of Li 6 and Li 7 isotopes in the rigidity range from 1.9 to 25 GV. The measurements are based on 9.7 × 10 5 Li 6 and 1.04 × 10 6 Li 7 nuclei collected by the Alpha Magnetic Spectrometer on the International Space Station from May 2011 to October 2023. We observe that over the entire rigidity

Galaxy clusters, the largest gravitationally-bound structures in the Universe, primarily consist of dark matter, offering a unique opportunity for investigating its distribution and behavior. Our study involves an examination of the stellar-to-smooth dark matter mass fraction in the galaxy cluster lensing the quasar SDSS J1326+4806, while

We present the preliminary results of the sustainability survey carried out by the ``SEA Cero CO 2'' working group among Spanish astronomers. The survey aimed at studying, within a limited scope, the carbon footprint of astronomical research carried out in Spain, as well as to collect the opinion of Spanish astronomers about possible ways to reduce

Context. From a long-term Doppler monitoring campaign of 373 giant stars, we have identified ten giants with periodic radial velocity variations that are challenging to associate with planets. Similar cases in the literature are attributed to poorly understood intrinsic processes. Aims. Our goal is to confirm or refute the presence of planets