The energy budget of all known optical jets is discussed. It is found that to power the extended radio lobes of radio galaxies, the jet bulk motion on kpc...
On the physical origin of the second solar spectrum of the Sc II line at 4247 Å
Context: The peculiar three-peak structure of the linear polarization profile shown in the second solar spectrum by the Ba ii line at 4554 Å has been...
On the Possible Existence of Short-Period g-Mode Instabilities Powered by Nuclear-Burning Shells in Post-Asymptotic Giant Branch H-Deficient (PG1159-Type) Stars
We present a pulsational stability analysis of hot post-asymptotic giant branch (AGB) H-deficient pre-white dwarf stars with active He-burning shells. The...
On the possible triple central star system of PN SuWt 2: no ménage à trois at the heart of the Wedding Ring
SuWt 2 is a planetary nebula consisting of a bright ring-like waist from which protrude faint extended lobes - a morphology believed to be typical of...
On the post-common-envelope central star of the planetary nebula NGC 2346
The common-envelope phase is one of the most poorly understood phases of (binary) stellar evolution, in spite of its importance in the formation of a wide range...
On the post-T-Tauri nature of late-type visual companions to B-type stars
We report on intermediate-to-high resolution spectroscopy and standard broadband photometry of late-type visual companions to early-type stars. Our program...
On the potassium-rotation connection in late-type Alpha Persei stars
We present measurements of the K I λ 7699 line from spectra of 19 late-type members of the αPersei cluster obtained with the Intermediate Dispersion...
On the Presence of Metallofullerenes in Fullerene-rich Circumstellar Envelopes
The presence of neutral C 60 fullerenes in circumstellar environments has been firmly established by astronomical observations as well as laboratory experiments...
On the presence of thermal Sunyaev-Zel'dovich induced signal in the first-year WMAP temperature maps
Using available optical and X-ray catalogues of clusters and superclusters of galaxies, we build templates of thermal Sunyaev-Zel'dovich (tSZ) emission as they...