We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far...
H-alpha observations of AG Peg, obtained using an IPCS detector on the 2.5-m Isaac Newton Telescope of the Observatorio del Roque de Los Muchachos on November...
We examine the status of the threat posed to stellar-mass black hole candidates by the possible existence of Q-stars (compact objects with an exotic equation of...
An international team of astronomers, including researchers from the Instituto de Astrofísica de Canarias, has found for the first time an unusual star that...
The research, carried out by an international group incuding the Instituto de Astrofísica de Canarias(IAC) and the University of La Laguna (ULL) also show that...
Infrared photometry in the J, H and K bands, performed on a sample of 33 blue stragglers (BS) belonging to 8 open clusters is presented. This photometry has...
An observational test of the binary hypothesis for the origin of blue straggler stars is conducted by searching for radial velocity variables among 30 blue...
A search for binaries among 17 blue stragglers in five galactic clusters, NGC 7789, 6633, 6819, 6939, and M 67, has been performed using measurements of radial...
The RS CVn noneclipsing system II Peg has been observed in the J, H, K, L, and M infrared bands along a complete period. The shape of the light curve shows an...
