Search results for "Star"
showing 10 items of 4285 documents
Long-term optical variability of high-mass X-ray binaries. II. Spectroscopy
2016
We present the results of our monitoring program to study the long-term variability of the Halpha line in high-mass X-ray binaries. We have carried out the most complete optical spectroscopic study of the global properties of high-mass X-ray binaries so far with the analysis of more than 1100 spectra of 20 sources. Our aim is to characterise the optical variability timescales and study the interaction between the neutron star and the accreting material. Our results can be summarised as follows: i) we find that Be/X-ray binaries with narrow orbits are more variable than systems with long orbital periods, ii) we show that a Keplerian distribution of the gas particles provides a good descripti…
Non-thermal radiation from a pulsar wind interacting with an inhomogeneous stellar wind
2017
Binaries hosting a massive star and a non-accreting pulsar are powerful non-thermal emitters due to the interaction of the pulsar and the stellar wind. The winds of massive stars are thought to be inhomogeneous, which could have an impact on the non-thermal emission. We study numerically the impact of the presence of inhomogeneities or clumps in the stellar wind on the high-energy non-thermal radiation of high-mass binaries hosting a non-accreting pulsar. We compute the trajectories and physical properties of the streamlines in the shocked pulsar wind without clumps, with a small clump, and with a large one. This information is used to compute the synchrotron and inverse Compton emission fr…
Activity from the Be/X-ray binary system V0332+53 during its intermediate-luminosity outburst in 2008
2015
Aims: We present a study of the Be/X-ray binary system V 0332+53 with the main goal of characterizing its behavior mainly during the intermediate-luminosity X-ray event on 2008. In addition, we aim to contribute to the understanding of the global behavior of the donor companion by including optical data from our dedicated campaign starting on 2006. Methods: V 0332+53 was observed by RXTE and Swift during the decay of the intermediate-luminosity X-ray outburst of 2008, as well as with Suzaku before the rising of the third normal outburst of the 2010 series. In addition, we present recent data from the Spanish ground-based astronomical observatories of El Teide (Tenerife), Roque de los Muchac…
A study of the B and Be star population in the field of the LMC open cluster NGC 2004 with VLT-FLAMES
2005
Observations of hot stars belonging to the young cluster LMC-NGC2004 and its surrounding region have been obtained with the VLT-GIRAFFE facilities in MEDUSA mode. 25 Be stars were discovered; the proportion of Be stars compared to B-type stars is found to be of the same order in the LMC and in the Galaxy fields. 23 hot stars were discovered as spectroscopic binaries (SB1 and SB2), 5 of these are found to be eclipsing systems from the MACHO database, with periods of a few days. About 75% of the spectra in our sample are polluted by hydrogen (Halpha and Hgamma), [SII] and [NII] nebular lines. These lines are typical of HII regions. They could be associated with patchy nebulosities with a bi-m…
Successful Treatment of Catastrophic Antiphospholipid Antibody Syndrome (CAPS) Associated With Splenic Marginal-zone Lymphoma With Low-molecular Weig…
2008
ABSTRACT Case report A 69-year-old woman with splenic marginal-zone lymphoma was admitted with progressive abdominal pain and splenomegaly as the suspected cause of pain. Rituximab treatment (375 mg/m 2 ) had been initiated on the day of admission. Abdominal computerized tomography revealed splenic infarction. Laboratory tests showed elevation of liver enzymes and creatinine, low platelet count, prolonged partial thromboplastin time, and lupus anticoagulant positivity. The diagnosis of catastrophic antiphospholipid antibody syndrome was made. Weight-adjusted low-molecular weight heparin therapy was initiated. Freedom from symptoms and normalization of liver enzymes and creatinine occurred w…
Amenazas al sistema de bienestar español en los inicios del tercer milenio
2003
Los países europeos se encuentran en un proceso de convergencia que conlleva el planteamiento de similares problemas sociales, económicos y políticos. En particular, el bienestar se empieza a concebir como un valor supranacional que requiere de la conjunción de criterios y esfuerzos para su mantenimiento ante problemas sobrevenidos en todos los países, como son el aumento de la ratio de pensionistas y el aumento de la demanda de cuidados de larga duración, ambos muy correlacionados con el envejecimiento de la población europea, que significan una carga creciente sobre los sistemas públicos sanitario y de pensiones. Además, en los estados meridionales concurre otro fenómeno que afecta direct…
El futuro de la atención a la dependencia: sostenibilidad y prospectiva
2007
El aumento de la demanda de protección sociosanitaria en los Estados del bienestar y la amenaza a la sotenibilidad financiera de los mismos requiere de soluciones más eficaces, que proporcionen mayor calidad de vida, y más eficientes. El objetivo de este artículo es realizar una propuesta alternativa de escenarios de atención a la dependencia de máxima eficiencia, utilizando como referencia el coste de la misma, tanto en la asistencia social como en la asistencia sanitaria, basada en los principios de sostenibilidad social, calidad de vida y equidad. El artículo recoge datos sobre los costes de las estancias en hospitales de personas dependientes, y los costes y beneficios de los escenarios…
Appreciation and rumination, not problem solving and avoidance, mediate the effect of optimism on emotional wellbeing
2023
Research suggests that optimism is positively related to emotional wellbeing. However, little is known about the emotion regulation mechanisms that potentially explain (i.e., mediate) this relationship. The present study was designed to address this issue. To this end, it examined emotion regulation strategies (i.e., appreciation, rumi nation, problem solving, and avoidance) that are theoretically and/or empirically related to optimism as possible mediators of the optimism-emotional wellbeing relationship. In the first of two phases, we established a baseline measure of dispositional optimism among 218 French adults. In the second phase, an experience sampling method was used to assess emot…
Modalidades de escolarización para el alumnado con trastornos del espectro del autismo. (Modalities of education for children with autism spectrum di…
2016
La Comunidad Valenciana ofrece diferentes modalidades de escolarización para el alumnado con trastorno del espectro del autismo. Se comparan las características curriculares y los apoyos disponibles de las tres modalidades de escolarización más extendidas. Se utiliza una metodología de investigación cualitativa a través del análisis documental y de la observación participante de tres alumnos con TEA, escolarizados en estas tres modalidades durante los meses de febrero a mayo de 2014. Asimismo, se han analizado las opiniones que los docentes tienen sobre dichas modalidades, a través de cuestionarios de respuesta abierta.Existen diferencias importantes en las tres modalidades de escolarizació…