Polaris and its Kin

TL;DR

This review summarizes 165 years of Polaris observations, highlighting recent precise measurements, orbital solutions, and peculiar behaviors, and discusses its nature and similarities with other Cepheids in the first crossing of the instability strip.

Contribution

It provides a comprehensive synthesis of observational data on Polaris, including recent high-precision measurements and analysis of its unique period and amplitude variations.

Findings

Multiple orbital solutions for Polaris's binary system.

Recent precise measurements of parallax and angular diameter.

Polaris exhibits a unique period decrease during 1963-1966.

Abstract

A review is presented of the past 165 years of observation of the 4-day Cepheid Polaris, including the exciting results of the last 50 years, an interval that has produced three orbital solutions for the spectroscopic binary subsystem, recently resolved by HST, parameters for the optical companion, precise measurement of the star's trigonometric parallax and angular diameter, evidence for a rapid increase in its pulsation period, and observations of the dramatic decline and recent partial recovery of its light amplitude. There has been considerable discussion about the exact nature of the star, with potential resolutions summarized here. It is also noted that many of the star's characteristics are shared by a small number of other Cepheids that display rapid period increases identical to those predicted for stars in the first crossing of the instability strip, small light amplitudes, and intrinsic colors typical of variables lying near the center of the strip, where Cepheids of largest amplitude reside. While all members of the group appear to display the canonical traits of first crossers of the instability strip, Polaris has one unique peculiarity: a brief hiatus in its monotonic period increment between 1963 and 1966 during which the pulsation period underwent a dramatic decrease. Has the average brightness of the Cepheid also increased over the last millennium?