Polaris: History of Pulsation Activity since Discovery
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 in...
Збережено в:
Дата: | 2017 |
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Автори: | , , , |
Формат: | Стаття |
Мова: | English |
Опубліковано: |
Видавничий дім "Академперіодика" НАН України
2017
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Назва видання: | Наука та інновації |
Теми: | |
Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/117644 |
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Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
Цитувати: | Polaris: History of Pulsation Activity since Discovery / I.A. Usenko, V.V. Kovtyukh, A.S. Miroshnichenko, S. Danford // Наука та інновації. — 2017. — Т. 13, № 1. — С. 109-113. — Бібліогр.: 14 назв. — англ. |
Репозиторії
Digital Library of Periodicals of National Academy of Sciences of UkraineРезюме: | 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. |
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