Astrophysical: Binary stars

  • Publication
    An L0 dwarf companion in the brown dwarf desert, at 30 AU
    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...
  • Publication
    Applications of image sharpening techniques. I - Nebular structure in H-alpha of AG Peg
    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...
  • Publication
    Are Q-stars a serious threat for stellar-mass black hole candidates?
    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...
  • News
    Astronomers discover a pulsating teardrop-shaped star
    An international team of astronomers, including researchers from the Instituto de Astrofísica de Canarias, has found for the first time an unusual star that...
  • News
    Astronomers discover a “black widow” binary star system with the shortest orbital period known
    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...
  • News
    Astronomers find evidence that blue supergiant stars can be formed by the merger of two stars
    An international piece of research, led by the Instituto de Astrofísica de Canarias (IAC) has found clues to the nature of some of the brightest and hottest...
  • Publication
    Blue stragglers - A search for binaries in the infrared
    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...
  • Publication
    Blue stragglers and the binary hypothesis
    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...
  • Publication
    Blue stragglers in open clusters - A test of the binary hypothesis
    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...