منابع مشابه
On the H α emission from the β Cephei system
Context. Be stars, which are characterised by intermittent emission in their hydrogen lines, are known to be fast rotators. This fast rotation is a requirement for the formation of a Keplerian disk, which in turn gives rise to the emission. However, the pulsating, magnetic B1IV star β Cephei is a very slow rotator that still shows Hα emission episodes like in other Be stars, contradicting curre...
متن کاملH . E . S . S . observation of the Vela X nebula
Vela X is one of the nearest Pulsar Wind Nebulae (PWN) and has served as prototype for evolutionary studies. Associated with the pulsar B0833-45, Vela X has been observed at different wavelengths and in particular in and X-ray bands. The H.E.S.S. Cherenkov telescope array has observed Vela X in 2004 and 2005, discovering very high energy gamma-ray emission in this region, centered to the south ...
متن کاملar X iv : 1 10 8 . 28 74 v 1 [ m at h . Q A ] 1 4 A ug 2 01 1 THERMODYNAMIC SEMIRINGS
Thermodynamic semirings are deformed additive structures on characteristic one semirings, defined using a binary information measure. The algebraic properties of the semiring encode thermodynamical and information theoretic properties of the entropy function. Besides the case of the Shannon entropy, which arises in the context of geometry over the field with one element and the Witt constructio...
متن کاملar X iv : 0 90 4 . 11 74 v 3 [ nu cl - t h ] 1 9 Ju n 20 09 π − decay rates of p - shell hypernuclei revisited
Explicit expressions for the parity-violating s-wave and the parity-conserving p-wave contributions to π− weak-decay rates of Λ hypernuclei in the 1p shell are given in the weak-coupling limit, to update previous shell-model calculations and to compare with recent π− spectra and total decay rates measured by the FINUDA Collaboration for ΛLi, 9 ΛBe, 11 ΛB and 15 ΛN. A useful sum rule for the sum...
متن کاملar X iv : h ep - p h / 05 12 17 7 v 2 1 4
We extend our previous determination of the thermodynamic pressure of the Standard Model so that the result can be applied down to temperatures corresponding to the electroweak crossover. This requires a further resummation which can be cleanly organised within the effective theory framework. The result allows for a precise determination of the expansion rate of the Universe for temperatures ar...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1907
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/68.1.30