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Polaris: History of Pulsation Activity since Discovery

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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Bibliographic Details
Main Authors: Usenko, I.A., Kovtyukh, V.V., Miroshnichenko, A.S., Danford, S.
Format: Article
Language:English
Published: Видавничий дім "Академперіодика" НАН України 2017
Series:Наука та інновації
Subjects:
Наукові основи інноваційної діяльності
Online Access:http://dspace.nbuv.gov.ua/handle/123456789/117644
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Summary: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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