Polaris: History of Pulsation Activity since Discovery

I.O. Usenko; V.V. Kovtyukh; A.S. Miroshnichenko; S. Danford

doi:10.15407/scine13.01.099

Polaris: History of Pulsation Activity since Discovery

Authors

I.O. Usenko Astronomical Observatory, Odessa National University, Research Institute «Mykolaiv Astronomical Observatory»
V.V. Kovtyukh Astronomical Observatory, Odessa National University
A.S. Miroshnichenko Department of Physics and Astronomy, University of North Carolina at Greensboro
S. Danford Department of Physics and Astronomy, University of North Carolina at Greensboro

DOI:

https://doi.org/10.15407/scine13.01.099

Keywords:

Cepheids, pulsation periods, radial velocities, stars, variable amplitude, α Umi

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.

Downloads

Published

2024-08-27

How to Cite

Usenko, I., Kovtyukh, V., Miroshnichenko, A., & Danford, S. (2024). Polaris: History of Pulsation Activity since Discovery. Science and Innovation, 13(1), 99–103. https://doi.org/10.15407/scine13.01.099

Download Citation

Issue

Vol. 13 No. 1 (2017): Science and Innovation

Section

Scientific Framework of Innovation Activity

License

Copyright (c) 2024 Copyright Notice Authors published in the journal “Science and Innovation” agree to the following conditions: Authors retain copyright and grant the journal the right of first publication. Authors may enter into separate, additional contractual agreements for non-exclusive distribution of the version of their work (article) published in the journal “Science and Innovation” (for example, place it in an institutional repository or publish in their book), while confirming its initial publication in the journal “Science and innovation.” Authors are allowed to place their work on the Internet (for example, in institutional repositories or on their website).