Polaris Revisited

Details Polaris Revisited Polaris Revisited

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116..936k&link_type=abstract

The Astronomical Journal, Volume 116, Issue 2, pp. 936-940.

Astronomy and Astrophysics

Astronomy

21

Binaries: Spectroscopic, Stars: Variables: Cepheids, Stars: Individual: Name: Polaris

Scientific paper

We report 212 radial velocity measures of Polaris obtained during 1994-1997 and use these to rediscuss Polaris's changing pulsational amplitude and rate of period change during the 20th century. In the course of this work we discovered a serious error in an earlier paper, which led to our finding too steep a decline in amplitude in recent decades. We correct this error and no longer predict a cessation of pulsation in the 1990s. In fact, the new, more precise radial velocities suggest that the decrease in amplitude has abruptly stopped and that the peak-to-peak amplitude is holding steady at about 1.6 km s^-1, or 0.03 mag in V. The period, however, continues to change.

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