Context. Rubidium is one of the few elements produced by the neutron capture s- and r-processes in almost equal proportions. Recently, a Rb deficiency ([Rb/Fe]...
Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited
Context. Luminous Galactic OH/IR stars have been identified as massive (>4-5 M⊙) asymptotic giant branch (AGB) stars experiencing hot bottom burning and Li...
Rubidium, zirconium, and lithium production in intermediate-mass asymptotic giant branch stars
Context. A recent survey of a large sample of Galactic intermediate-mass (>3 M&sun;) asymptotic giant branch (AGB) stars shows that they exhibit large...
A long-debated issue concerning the nucleosynthesis of neutron-rich elements in asymptotic giant branch (AGB) stars is the identification of the neutron source...
Ruling out the Orbital Decay of the WASP-43b Exoplanet
We present 15 new transit observations of the exoplanet WASP-43b in the i‧, g‧, and R filters with the 1.0 m telescopes of Las Cumbres Observatory Global...
RXCJ1111.6+4050 galaxy cluster: Observational evidence of a transitional fossil group
We present a detailed kinematical and dynamical study of the galaxy cluster RXCJ1111.6+4050 (RXCJ1111), at z = 0.0756 using 104 new spectroscopic redshifts of...
RXJ 0921+4529: A Binary Quasar or a Gravitational Lens?
We report the new spectroscopic observations of the gravitational lens RXJ 021+4529 with the multi-mode focal reducer SCORPIO of the SAO RAS 6 m telescope. The...
S Ori J053825.4-024241: a classical T Tauri-like object at the substellar boundary
We present a spectrophotometric analysis of S Ori J053825.4-024241, a candidate member close to the substellar boundary of the young (1-8 Myr), nearby (~360 pc)...
s-process enrichment in the planetary nebula NGC 3918. Results from deep echelle spectrophotometry
The chemical content of the planetary nebula NGC 3918 is investigated through deep, high-resolution (R ˜ 40 000) UVES (Ultraviolet-Visual Echelle Spectrograph)...