Browsing Physics by Sponsor "NASA"
Now showing items 1-7 of 7
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Chandra observations of coronal emission from the early-G supergiants Alpha and Beta Aquarii
(University of Colorado, 2005)We report Chandra detections of coronal X-rays from the early-G supergiants ? Aquarii (HD209750: G2 Ib) and ? Aquarii (HD204867: G0 Ib). Previous ROSAT observations of these archetype \hybrid chromosphere" stars were ... -
Coronal Mass Ejection Detection using Wavelets, Curvelets and Ridgelets: Applications for Space Weather Monitoring
(2011)Coronal mass ejections (CMEs) are large-scale eruptions of plasma and magnetic field that can produce adverse space weather at Earth and other locations in the Heliosphere. Due to the intrinsic multiscale nature of features ... -
Mg I emission lines at 12 and 18?m in K giants
(EDP Sciences, 2008)Context. The solar mid-infrared metallic emission lines have already been observed and analyzed well, and the formation scenario of the Mg I 12 $\rm\mu$m lines has been known for more than a decade. Detections of stellar ... -
Water vapor on Betelgeuse as revealed by TEXES high-resolution 12 micron spectra
(American Astronomical Society, 2006)The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged. They have shown, for ... -
Water vapor on supergiants. The 12 micron TEXES spectra of ? Cephei
(American Astronomical Society, 2006)Several recent papers have argued for warm, semidetached, molecular layers surrounding red giant and supergiant stars, a concept known as a MOLsphere. Spectroscopic and interferometric analyses have often corroborated this ...