The radial-velocity variations of Polaris - A Cepheid leaving the instability strip?

Details The radial-velocity variations of Polaris - A Cepheid leaving the instability strip? The radial-velocity variations of Polaris - A Cepheid leaving the instability strip?

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2249d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2249-2263. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

24

Binary Stars, Cepheid Variables, Radial Velocity, Stellar Systems, Supergiant Stars, Doppler Effect, Stellar Evolution, Stellar Oscillations, Stellar Rotation, Stellar Spectrophotometry

Scientific paper

The radial velocities of Cepheid Polaris are measured using 237 Reticon spectra. The data show a pulsation period of 3.9746 + or - 0.0008 days and RV amplitude 2K = 1.50 + or - 0.08 km/s. It is shown that Polaris has been undergoing a steady period increase, consistent with redward evolution across the instability strip. A post-1980 drop in amplitude and the redward evolution of Polaris suggest that the source is leaving the strip and may cease its pulsation as early as 1995.

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