Proper motions of young stars in Chamaeleon. I. A Virtual Observatory study of spectroscopically confirmed members

(abridged) We want to provide further evidence of the origin of the proposed stellar members of Chamaeleon and to identify interlopers from the foreground \epsilon Cha and \eta Cha associations. To this aim, we compile lists of spectroscopically confirmed members of Chamaeleon I and II, \epsilon Cha and \eta Cha, and of background objects in the same line of sight. Using Virtual Observatory tools, we cross-match these lists with the UCAC3 catalogue to get the proper motions of the objects. In the vector point diagram, we identify the different moving groups, and use this information to study the membership of proposed candidate members of the associations from the literature. For those objects with available radial velocities, we compute their Galactic space velocities. We look for correlations between the known properties of the objects and their proper motions. The members of the dark clouds exhibit clearly different proper motions from those of the foreground associations and of the background stars. The data suggest that Chamaeleon II could have different dynamical properties from Chamaeleon I. Although the two foreground clusters \epsilon and \eta Chamaeleontis constitute two different proper motion groups, they have similar spatial motions, which are different from the spatial motion of Chamaeleon I. On the other hand, the space motions of the Chamaeleon II stars look more similar to those of the foreground clusters than to the Chamaeleon I stars, but the numbers are low. Hence, with the available data it is unclear to what extent the stellar populations in both clouds are physically connected to each other. We find no correlations between the proper motions and the properties of the objects in either of the clouds

Theorical aspects in measurement of impacts on social environment of special wastes

La gestión de los residuos tóxicos y\ud peligrosos es uno de los objetivos prioritarios en los países desarrollados. Los planes elaborados para ello deben considerar tanto el posible impacto\ud ambiental que provocan las instalaciones de tratamiento como el posible efecto sobre el medio social. El objetivo de este trabajo es la discusión conceptual de los efectos de los centros de gestión de residuos en el medio social y la selección de los\ud indicadores apropiados a partir de la encuesta directa a expenos y AdministraciónThe management of toxic an dangerous waste is one of the main goal of the development countries. The plans elaborated by those countries must consider, the posible environmental impact\ud that produce the treatment facilities and the effect\ud upon the social environment. The objetive of this work is the discussion of the effects of the management waste centers upon the social environment\ud and the selection of the appropiate variables based\ud on direct questionaries to experts and administrations

Proyecto de convivencia para niños de familias desestructuradas: Una experiencia estival en onda

Vuitenes Jornades de Foment de la Investigació de la FCHS (Any 2002-2003)Este “proyecto de convivencia para niños de familias desestructuradas: una experiencia estival en Onda” surge por la necesidad de intervenir en la resolución de los problemas y necesidades educativas de una comunidad. Como su título indica, va dirigido a niños procedentes de ambientes familiares desestructurados, con bajos niveles socio-económico y culturales con residencia en la localidad castellonense de Onda. Concretamente, el grupo escogido se compone por 60 niños (30 niños y 30 niñas) con edades de 6 a 14 años (entre 1º de Primaria y 2º de ESO) Los objetivos generales del proyecto son los siguientes: 1-Adquirir habilidades de convivencia. Interaccionar con iguales; Aprender a dialogar y a respetar; Fomentar actividades cooperativas. Transmitir normas y valores. 2-Adquirir hábitos de higiene. Lavarse los dientes. Ducharse, peinarse y asearse. Utilizar los cubiertos. Comportarse en la mesa. Enseñar a pedir y agradecer. 3-Adquirir habilidades de control emocional. Desarrollar habilidades comunicativas. Generar alternativas. Pedir disculpas. Respetar derechos propios. La finalidad que persigue el proyecto a través de la realización de estas colonias de verano es no es que los alumnos aprendan las disciplinas sino que el conocimiento que éstas puedan aportar les sirva para reconstruir sus formas de pensar, sentir y de actuar, con la intención de reconstruir los conocimientos vitales que cada uno ha ido construyendo en su contexto y que esto les ayude a ser más capaces y competentes en la superación de los retos y problemas que les plantea el mundo que les ha tocado vivir

Crucial aspects of the initial mass function (I): The statistical correlation between the total mass of an ensemble of stars and its most massive star

Our understanding of stellar systems depends on the adopted interpretation of the IMF, phi(m). Unfortunately, there is not a common interpretation of the IMF, which leads to different methodologies and diverging analysis of observational data.We study the correlation between the most massive star that a cluster would host, mmax, and its total mass into stars, M, as an example where different views of the IMF lead to different results. We assume that the IMF is a probability distribution function and analyze the mmax-M correlation within this context. We also examine the meaning of the equation used to derive a theoretical M-char_mmax relationship, N x int[Char_mmax-mup] phi(m) dm = 1 with N the total number of stars in the system, according to different interpretations of the IMF. We find that only a probabilistic interpretation of the IMF, where stellar masses are identically independent distributed random variables, provides a self-consistent result. Neither M nor N, can be used as IMF scaling factors. In addition, Char_mmax is a characteristic maximum stellar mass in the cluster, but not the actual maximum stellar mass. A -Char_mmax correlation is a natural result of a probabilistic interpretation of the IMF; however, the distribution of observational data in the N (or M)-cmmax plane includes a dependence on the distribution of the total number of stars, N (and M), in the system, Phi(N), which is not usually taken into consideration. We conclude that a random sampling IMF is not in contradiction to a possible mmax-M physical law. However, such a law cannot be obtained from IMF algebraic manipulation or included analytically in the IMF functional form. The possible physical information that would be obtained from the N (or M)-mmax correlation is closely linked with the Phi(M) and Phi(N) distributions; hence it depends on the star formation process and the assumed.Comment: Accepted by A&A; 16 pages, 10 figure