The pulsation mode of the Cepheid Polaris

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dc.creator Turner, David Gerald, 1945-
dc.creator Kovtyukh, V. V.
dc.creator Usenko, I. A.
dc.creator Gorlova, N. I. 2018-02-23T16:08:42Z 2018-02-23T16:08:42Z 2013-01-01
dc.identifier.issn 2041-8205
dc.description Publisher's version/PDF
dc.description.abstract <p>A previously derived photometric parallax of 10.10 &plusmn; 0.20 mas, d = 99 &plusmn; 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 &lang;M<sub>V</sub>&rang; = &minus;3.07 &plusmn; 0.01 s.e., average effective temperature of &lang;T<sub>eff</sub>&rang; = 6025 &plusmn; 1 K s.e., and intrinsic color of (&lang;B&rang; &minus; &lang;V&rang;)<sub>0</sub> = +0.56 &plusmn; 0.01 s.e., which match values obtained previously from the photometric parallax for a space reddening of E<sub>B&minus;V</sub> = 0.02 &plusmn; 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 <em>Hipparcos</em> parallax for Polaris appears discrepant by comparison.</p>
dc.language.iso en en_CA
dc.publisher IOP Publishing Limited en_CA
dc.subject.lcsh Polestar
dc.subject.lcsh Cepheids
dc.title The pulsation mode of the Cepheid Polaris en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal Letters 762(1), L8. (2013) en_CA

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