ISSN 2413-4996 (English ed. Online)
ISSN 2409-9066 (English ed. Print)
ISSN 2409-9066 (English ed. Print)
Polaris: History of Pulsation Activity since Discovery
| Title | Polaris: History of Pulsation Activity since Discovery |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Usenko, IO, Kovtyukh, VV, Miroshnichenko, AS, Danford, S |
| Short Title | Sci. innov. |
| DOI | 10.15407/scine13.01.099 |
| Volume | 13 |
| Issue | 1 |
| Section | Scientific Framework of Innovation Activities |
| Pagination | 99-103 |
| Language | English |
| 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.
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| Keywords | Cepheids, pulsation periods, radial velocities, stars, variable amplitude, α Umi |