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- W2891950461 abstract "We present an analysis of 67 recent spectra of α UMi (Polaris) obtained in 2017 August–2018 May. Frequency analysis reveals an increase in the pulsation period to |$3{{^{rm d}_{.}}}970662$| relative to our 2016/17 observations. The radial velocity amplitude was found to be 3.87 |$mathrm{, km, s}^{-1}$| in the last half of 2017, but dropped to 2.80 |$mathrm{, km, s}^{-1}$| during the first half of 2018. In comparison with 4.16 |$mathrm{, km, s}^{-1}$| observed by us in 2015, the observations reveal a new decrease in pulsation amplitude. Such a result is unexpected given that a gradual amplitude growth was evident during the last decade. The average values of |${T_{rm eff}, }$| were found to be 6017 K and 6039 K, respectively, but the |${T_{rm eff}, }$| amplitude has increased despite the decrease in radial velocity amplitude. Possibly that could be explained by the presence of starspots on the Cepheid’s surface." @default.
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- W2891950461 date "2018-09-10" @default.
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- W2891950461 title "Pulsational activity changes in the Cepheid Polaris (α UMi) during 2017–2018: a new amplitude decrease" @default.
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- W2891950461 doi "https://doi.org/10.1093/mnrasl/sly170" @default.
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