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Mysteriously Slow Pulses From Giant Old Stars May Finally Have an Explanation The extremely slow, steady pulsations of light from many red giant stars may finally have an explanation. According to a new analysis, these mysterious fluctuations in brightness are not caused by internal processes after all, but by binary companions obscured in clouds of dust siphoned off the dying giants.
When stars of intermediate mass below around eight times the mass of the Sun reach the twilight of their lives, they go through some pretty dramatic changes. When they have fused all the hydrogen in their cores to helium, the nuclear fusion within ceases, and the core starts to contract. This brings more hydrogen into the region immediately around the core, forming a hydrogen shell; then, fusion starts up again, dumping helium into the core. This is called hydrogen shell burning. ....
Research into New Sensors to Monitor Drugs, Speed Up Cancer Detection and Measure Climate Change impact Written by AZoOpticsApr 13 2021 A team of photonics engineers, healthcare clinicians and oceanographers are set to lead an ambitious project to develop the next generation of photonics technology that will enable rapid diagnostic medical screening and environmental monitoring. Vision of low cost sensor technology for measuring drug concentrations Image Credit: David Rowe, University of Southampton. Silicon photonics has transformed data communications technology thanks to its low cost and high performance. This new research project will aim to bring the benefits of this technology to a range of new applications that could be manufactured at a mass scale to solve societal challenges and transform peoples’ lives. Currently silicon photonics applications operate in the near-infrared wavelength range (1.2 μm – 1.6 μm). Key to this project ....