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...

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Бібліографічні деталі
Дата:2017
Автори: Usenko, I.A., Kovtyukh, V.V., Miroshnichenko, A.S., Danford, S.
Формат: Стаття
Мова:English
Опубліковано: Видавничий дім "Академперіодика" НАН України 2017
Назва видання:Наука та інновації
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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.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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Резюме: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.