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- W324062494 abstract "We have calibrated optical and near-infrared surface brightness { colour relations for cool giant and supergiant stars usinghigh-precisionangulardiametersofthesestarsdetermined from Michelson interferometry. We nd that the giant and su- pergiant relations are undistinguishable over a wide range of in- trinsic colours. We independently determine the slopes of these relationsobeyedbyCepheidvariablesandndthatinallthedia- grams considered, these agree very well with the slopes derived from the stable giants and supergiants. Forcing the slopes to the values derived from the Cepheids, we determine a very precise value of the zero point of the surface brightness { colour rela- tions valid for Cepheid variables, which is 3:947 0:003. This value is in agreement with the one derived from the Cepheid effective temperature scale of Pel (1978), and from the lunar occultation angular diameter of the Cepheid Gem (Ridgway et al.1982). We apply our newly calibrated surface brightness { colour relations to the cluster Cepheid U Sgr to nd its radius and dis- tance from the optical V , V RJ and the infrared V , V K and K, J K Barnes-Evans technique. While the numerical valuesderivedfromthethreedifferentversionsofthetechnique do agree within 1, the near-infrared distance and radius values are 5 10 times more accurate than the optical one; in par- ticular, the distance and radius of the star derived from the V , V K solution are 592 4 pc and 48:7 0:3 solar radii, re- spectively,witherrorslessthan1percent.Webrieflydiscussthe potentialofthenear-infraredversionsoftheBarnes-Evanstech- nique to set a very accurate (0.02 mag) zero point to Cepheid period-luminosityrelationsandthusmakeaveryimportantcon- tribution to the absolute calibration of the extragalactic distance scale." @default.
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- W324062494 date "1997-04-01" @default.
- W324062494 modified "2023-09-24" @default.
- W324062494 title "An improved calibration of Cepheid visual and infrared surface brightness relations from accurate angular diameter measurements of cool giants and supergiants." @default.
- W324062494 hasPublicationYear "1997" @default.
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