An eclipse in FO Aquarii

Twisted accretion curtains in the intermediate polar FO Aquarii

We report on a ∼ 37-ks XMM-Newton observation of the intermediate polar FO Aquarii, presenting X-ray and UV data from the EPIC and OM cameras. We find that the system has changed from its previously reported state of disc-overflow accretion to one of purely disc-fed accretion. We detect the previously reported ‘notch’ feature in the X-ray spin pulse, and explain it as a partial occultation of t...

The changing X-ray light curves of the intermediate polar FO Aquarii

Comparison of five X-ray observations of the intermediate polar FO Aqr reveals that the morphology of the X-ray light curve changes considerably with time. In particular, power spectra of the 1988 Ginga and 1993 ASCA data reveal strong sideband and orbital variations, whereas the 1990 Ginga observation does not. This suggests that the amount of stream-fed accretion varies with epoch, and the sy...

An Eclipse before Sunset

Wolf - An Eclipse Plug-In for WADE

This paper describes WOLF, a development environment for WADE-based applications. WADE is a software platform, based on JADE, a popular Open Source framework, for the development of distributed applications based on the agent oriented paradigm and exploiting the workflow metaphor to define system logics. The main advantage of the workflow metaphor is the expressiveness of the workflow itself, s...

Is an eclipse described in the Odyssey?

Plutarch and Heraclitus believed a certain passage in the 20th book of the Odyssey ("Theoclymenus's prophecy") to be a poetic description of a total solar eclipse. In the late 1920s, Schoch and Neugebauer computed that the solar eclipse of 16 April 1178 B.C.E. was total over the Ionian Islands and was the only suitable eclipse in more than a century to agree with classical estimates of the deca...