2 resultados para 1455

em Universidad de Alicante


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High-mass X-ray binaries consist of a massive donor star and a compact object. While several of those systems have been well studied in X-rays, little is known for most of the donor stars as they are often heavily obscured in the optical and ultraviolet regime. There is an opportunity to observe them at infrared wavelengths, however. The goal of this study is to obtain the stellar and wind parameters of the donor star in the X1908+075 high-mass X-ray binary system with a stellar atmosphere model to check whether previous studies from X-ray observations and spectral morphology lead to a sufficient description of the donor star. We obtained H- and K-band spectra of X1908+075 and analysed them with the Potsdam Wolf-Rayet (PoWR) model atmosphere code. For the first time, we calculated a stellar atmosphere model for the donor star, whose main parameters are: Mspec = 15 ± 6 M⊙, T∗ = 23-3+6 kK, log geff = 3.0 ± 0.2 and log L/L⊙ = 4.81 ± 0.25. The obtained parameters point towards an early B-type (B0–B3) star, probably in a supergiant phase. Moreover we determined a more accurate distance to the system of 4.85 ± 0.50 kpc than the previously reported value.

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El propòsit de la xarxa 3252 ha estat el de plantejar una sèrie de canvis en la guia docent de l’assignatura «Llengua Catalana aplicada a les Ciències de l’Activitat Física i l’Esport» (codi 16830), la qual, al nostre parer, acompleix els requisits de llengua d’ús homologable a d’altres d’impartides pel Departament de Filologia Catalana de la UA a la Facultat d’Educació, però no compta amb un inseriment adient en el marc dels estudis del grau que l’acull, ço és, CAFE. En aquest sentit, la memòria present vol ser testimoni dels canvis suggerits en pro d’un encaixament més orgànic i esclaridor d’acord amb una visió fonamentada en el Tractament Integrat de Llengua i Continguts.