What goes on inside the heart of a star? Astronomers have been developing theories about stars inner workings for decades, but evidence to confirm the details of those theories has been sparse.
Figure1: A 5x5 arcminute CCD image of the prototype gravity-mode pulsating subdwarf B star, PG1716+426, and nearby comparison stars. North is up and East is to the left. The subdwarf B star pulsator is the brightest star in the northeast quadrant. The image was taken through an R filter at the University of Arizona Mt. Bigelow 1.6 m telescope and is one of hundreds used to measure the light curve of the star.
Photo Credit: Courtesy of Elizabeth Green of Steward Observatory at the University of Arizona and NSF.
In research supported by NSF, University of Arizona astronomer Elizabeth Green and colleagues have found a new subset of "nearly-naked" stars that dim and brighten due to pulses in their cores. The stars, which may help unlock secrets of advanced stages of stellar evolution, are described in the January 20 Astrophysical Journal Letters.
Chemical and physical changes inside star cores cause the light they emit to pulsate, becoming brighter and dimmer in slowly changing patterns. Analysis of these pulsations would give scientists a better of idea of the processes going on inside stars and help them understand how they change from one type to another. Until now, though, astronomers have been frustrated by the faintness of the pulses.
Roberta Hotinski | National Science Foundation
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Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
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Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
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For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
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An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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