Visualizing Stars and Emission Nebulas

The Colors of the Deep Sky

The term deep sky object is popular among astronomers to describe those faint patches among the stars that can be found only with optical assistance. The equipment needed to take pictures of deep sky objects is within the reach of dedicated amateur astronomers. In such low light levels there strictly is no color, but there is a natural desire to make these images look as they might appear if ou...

Evolution of Minerals

marc h 2010 H o ll y li n d em Once upon a time there were no minerals anywhere in the cosmos. No solids of any kind could have formed, much less survived, in the superheated maelstrom following the big bang. It took half a million years before the first atoms—hydrogen, helium and a bit of lithium—emerged from the cauldron of creation. Millions more years passed while gravity coaxed these primo...

Nebulas: Using Distributed Voluntary Resources to Build Clouds

Current cloud services are deployed on wellprovisioned and centrally controlled infrastructures. However, there are several classes of services for which the current cloud model may not fit well: some do not need strong performance guarantees, the pricing may be too expensive for some, and some may be constrained by the data movement costs to the cloud. To satisfy the requirements of such servi...

NEBULAS: High performance data-driven event building architectures based on asynchronous self-routing packet-switching networks

The chromospheric emission of solar - type stars in the young open clusters IC 2391 and IC 2602

In this paper we present chromospheric emission levels of the solar-type stars in the young open clusters IC 2391 and IC 2602. High resolution spectroscopic data were obtained for over 50 F, G, and K stars from these clusters over several observing campaigns using the University College London Echelle Spectrograph on the 3.9-m Anglo-Australian Telescope. Unlike older clusters, the majority (28/...