Polaris: History of Pulsation Activity since Discovery
- UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
- Anatoly S. Miroshnichenko, Professor (Creator)
- Institution
- The University of North Carolina at Greensboro (UNCG )
- Web Site: http://library.uncg.edu/
Abstract: 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.
Polaris: History of Pulsation Activity since Discovery
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Created on 12/21/2017
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Additional Information
- Publication
- Nauka ta Innovacii, 13(1). 109-113
- Language: English
- Date: 2017
- Keywords
- Cepheids, pulsation periods, radial velocities, stars, variable amplitude, a Umi