Confirmation of the decreased pulsational amplitude of Polaris

Details Confirmation of the decreased pulsational amplitude of Polaris Confirmation of the decreased pulsational amplitude of Polaris

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jrasc..78..173k&link_type=abstract

Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 78, Oct. 1984, p. 173-177. Research supported by the

Astronomy and Astrophysics

Astronomy

17

Binary Stars, Cepheid Variables, Stellar Oscillations, Supergiant Stars, Orbital Elements, Radial Velocity

Scientific paper

Data from radial-velocity observations of Polaris, obtained at dispersion 8 A/mm on 34 plates using the blue image slicer and Cassegrain spectrograph on the 1.9-m telescope at David Dunlap Observatory during March-September 1983, are presented in tables and graphs and characterized. The best fit to the data is obtained using a sine curve with amplitude 1.4 + or - 0.3 km/sec, in agreement with the findings of Arellano Ferro (1983) and showing a marked decrease from the 2.8 km/sec amplitude found in the averaged Lick Observatory data for 1896-1958 by Roemer (1965). The difficulties encountered in an attempt to fit the Lick data with a sine function having a secularly varying period with higher-order phase-drift terms are discussed.

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