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- R. Fender3 profiles44 · h 78
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- Goddard Space Flight CenterUS52 papers
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7 papers · 1 filter
Stellar wind signatures in sdB stars?
U. Heber, P. F. L. Maxted, T. R. Marsh +2
Subdwarf B (sdB) stars form the blue end of the horizonal branch (EHB). Their peculiar atmospheric abundance patterns are due to diffusion processes. However, diffusion models fail…
AGN as cosmic thermostats
Christian R. Kaiser, Marcus Brueggen, James J. Binney
We present a simple analytical model and the results of numerical simulations supporting the idea of periodical heating of cluster gas by AGN outflows. We show why, under this assu…
New subdwarf B star periods
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +1
Subdwarf B (sdB) stars are thought to be helium burning stars with low mass hydrogen envelopes. Several evolutionary paths have been proposed to explain the formation of these syst…
Pair Annihilation and Radio Emission from Nova Muscae
D. C. Hannikainen, C. R. Kaiser
In the hard X-ray spectra of some X-ray binaries line features around 500 keV are detected. We interpret these as arising from pair annihilation in relativistic outflows leading to…
Modelling Oscillations in GRS 1915+105 Jet Emission
Ross S. Collins, Christian R. Kaiser, Simon J. Cox
We have studied time variability in the flux from the flat spectrum synchrotron radiation of the Blandford & Konigl (1979) model for relativistic, conical jets. The resulting model…
Refined and l-adic Euler characteristics of nearly perfect complexes
David Burns, Bernhard Köck, Victor Snaith
We lift the Euler characteristic of a nearly perfect complex to a relative algebraic K-group by passing to its l-adic Euler characteristics.