5 research outputs found

    Polaris: History of Pulsation Activity since Discovery

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    The pulsation activity of small-amplitude Cepheid Alpha UMi (Polaris) during the period of its radial velocity observations has been analyzed. In the 20th century, Polaris was known to demonstrate a decrease in radial velocity amplitude to the minimum, in the 1980s. Thereafter, the amplitude has increased. The observations of September-December 2015 (21 spectra) obtained by 81cm telescope TCO with spectrograph have showed that radial velocity amplitude comes to 4.16 km/s and is approximately twice higher than the estimates made in 2007, with pulsation period adding 8.6 min

    Ion Composition of the Earth’s Radiation Belts in the Range from 100 keV to 100 MeV / nucleon 100\mbox{ MeV}/\mbox{nucleon} : Fifty Years of Research

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    Old-Aged Primary Distance Indicators

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    Old-Aged Primary Distance Indicators

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