منابع مشابه
The infrared spectrum of the Be star γ Cassiopeiae ⋆
We present the 2.4−45 μm ISO-SWS spectrum of the Be star γ Cas (B0.5 IVe). The spectrum is characterised by a thermal continuum which can be well fit by a powerlaw Sν ∝ ν0.99 over the entire SWS wavelength range. For an isothermal disc of ionized gas with constant opening angle, this correponds to a density gradient ρ(r) ∝ r−2.8. We report the detection of the Humphreys (6-∞) bound-free jump in...
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متن کاملBeppoSAX broad–band observations of Gamma Cassiopeiae
We report broad-band X-ray measurements of the Be star γ Cassiopeiae by the BeppoSAX X-ray astronomy satellite. The observations took place on 1998 July, 18–23. The 0.1– 200 keV X-ray spectrum is reasonably well fit by an optically thin thermal plasma model of temperature 12.5±0.6 keV with significant residuals around 0.3 keV and 1 keV. The former is interpreted as the variable soft component r...
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cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Science
سال: 1885
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-6.143.386-a