988 resultados para Crenne, Hélisenne de, époque 1538-1541


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Textos en valenciano y en castellano

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Context. 4U 1538−52, an absorbed high mass X-ray binary with an orbital period of ~3.73 days, shows moderate orbital intensity modulations with a low level of counts during the eclipse. Several models have been proposed to explain the accretion at different orbital phases by a spherically symmetric stellar wind from the companion. Aims. The aim of this work is to study both the light curve and orbital phase spectroscopy of this source in the long term. In particular, we study the folded light curve and the changes in the spectral parameters with orbital phase to analyse the stellar wind of QV Nor, the mass donor of this binary system. Methods. We used all the observations made from the Gas Slit Camera on board MAXI of 4U 1538−52 covering many orbits continuously. We obtained the good interval times for all orbital phase ranges, which were the input for extracting our data. We estimated the orbital period of the system and then folded the light curves, and we fitted the X-ray spectra with the same model for every orbital phase spectrum. We also extracted the averaged spectrum of all the MAXI data available. Results. The MAXI spectra in the 2–20 keV energy range were fitted with an absorbed Comptonisation of cool photons on hot electrons. We found a strong orbital dependence of the absorption column density but neither the fluorescence iron emission line nor low energy excess were needed to fit the MAXI spectra. The variation in the spectral parameters over the binary orbit were used to examine the mode of accretion onto the neutron star in 4U 1538−52. We deduce a best value of Ṁ/v∞ = 0.65 × 10-9M⊙ yr-1/ (km s-1) for QV Nor.

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Situé dans la vallée de la Birse, Reinach appartient à l'arrière-pays de Bâle et est localisé dans la plaine du Rhin supérieur. Cette zone jouant un rôle important pendant la Guerre des Gaules ainsi que durant le Ier siècle apr. J.-C., on doit envisager de forts bouleversements du peuplement de cette région au changement d'ère. Grâce à des conditions favorables, les structures de La Tène finale au lieu-dit "Mausacker" sont très bien conservées et permettent de restituer une ferme laténienne avec deux phases différentes. Au même endroit se situe une villa gallo-romaine, mieux connue par ses enclos funéraires que par les structures résidentielles. Des études pluridisciplinaires financées par le Fonds national suisse (FNS) sont en cours pour les vestiges laténiens et gallo-romains de Reinach-Nord.

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Mode of access: Internet.

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"Addenda et corrigenda" tipped in.

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Paged continuously; v. 1: xxxii, 606 p.; v. 2: 2 p. l., [607]-1365, [1] p.

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Mode of access: Internet.