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Accretion disks around compact objects are expected to enter an unstable phase at high luminosity. One instability may occur when the radiation pressure generated by accretion modifies the disk viscosity, resulting in the cyclic depletion and refilling of the inner disk on short timescales. Such a scenario, however, has only been quantitatively verified for a single stellar-mass black hole. Although there are hints of these cycles in a few isolated cases, their apparent absence in the variable emission of most bright accreting neutron stars and black holes has been a continuing puzzle. Here
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La XXXIV Canary Islands Winter School of Astrophysics, organizada por el Instituto de Astrofísica de Canarias (IAC) y la Universidad de La Laguna (ULL), tendrá lugar entre los días 8 y 15 de noviembre. En esta edición, cerca de 60 estudiantes de 15 países se reunirán para conocer los últimos avances en el campo de la evolución de galaxias, con el Grupo Local como punto de referencia. Durante una semana, el edificio IACTEC, en el Parque Científico y Tecnológico de Tenerife (La Laguna), acogerá a 60 estudiantes de máster, doctorado y postdoctorado para nutrirse sobre las novedades del panorama
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After comparative studies of a sample of almost 50 open stellar clusters of different ages in the Milky Way, research led by the Instituto de Astrofísica de Canarias (IAC) and the University of La Laguna (ULL) with collaboration by the Polytechnic University of Cartagena, shows that when these star clusters age they lose the majority of their less massive members. This result confirms that there are internal dynamical processes in open clusters caused by their long journeys through the Galaxy, which bring about the expulsion of these low mass stars. The study, published in the journal
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