Period and amplitude variations of Polaris

Details Period and amplitude variations of Polaris Period and amplitude variations of Polaris

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..755a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 755-762. Research supported by the Consejo Nacional

Astronomy and Astrophysics

Astrophysics

38

Astronomical Photometry, Cepheid Variables, Periodic Variations, Radial Velocity, Stellar Spectrophotometry, Ephemeris Time, Light Curve, Secular Variations, Stellar Color, Ubv Spectra

Scientific paper

A reinterpretation of the pulsational O-C residuals for Polaris (α UMi), combining photometric and radial velocity observations, shows that the pulsational period has been steadily increasing for the last 100 years, with a period increase rate of 316 s per century. The O-C residuals from this ephemeris are significant, and cannot be explained by light-time effects caused by the orbital motion of Polaris around its unseen companion, or by gravitational effects of the companion at closest approach. The photometric amplitude and the pulsational radial velocity amplitude have decreased since the 1940s. These phenomena may be related to the star leaving the instability strip.

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