Turner, David Gerald, 1945-; Kovtyukh, V. V.; Usenko, I. A.; Gorlova, N. I. (IOP Publishing Limited, 2013-01-01)
<p>A previously derived photometric parallax of 10.10 ± 0.20 mas, d = 99 ± 2 pc, is confirmed for Polaris by a spectroscopic parallax derived using line ratios in high dispersion spectra for the Cepheid. The resulting estimates for the mean luminosity of ⟨M<sub>V</sub>⟩ = −3.07 ± 0.01 s.e., average effective temperature of ⟨T<sub>eff</sub>⟩ = 6025 ± 1 K s.e., and intrinsic color of (⟨B⟩ − ⟨V⟩)<sub>0</sub> = +0.56 ± 0.01 s.e., which match values obtained previously from the photometric parallax for a space reddening of E<sub>B−V</sub> = 0.02 ± 0.01, are consistent with fundamental mode pulsation for Polaris and a first crossing of the instability strip, as also argued by its rapid rate of period increase. The systematically smaller Hipparcos parallax for Polaris appears discrepant by comparison.</p>...