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HD 30744


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A UVBY beta photometric study of RR Lyrae stars. I
Results of high-phase-resolution uvby beta photometry of RR Lyrae starsare used to derive effective temperatures, surface gravities and meanabsolute magnitudes, which are important for the use of RR Lyrae starsas distance indicators within the Galaxy. Dereddening of the data wasperformed according to the average of E(b-y) over an orbital period, andeffective temperatures and surface gravities were derived through theuse of color-calibrated atmospheric grids for the metal-poor RRabprogram stars SU Dra, RX Eri and RR Lyr. Application of theBaade-Wesselink method to the data results in values for the meanabsolute magnitudes of these metal-poor stars which average 0.42magnitudes, which is significantly less than the canonical value of 0.6magnitudes.

Identifications of Comparison Stars for RR Lyrae Variables
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观测天体数据

星座:波江座
右阿森松:04h49m37.99s
赤纬:-15°48'32.5"
视星:8.28
距离:103.734 天文距离
右阿森松适当运动:-51.2
赤纬适当运动:-89.4
B-T magnitude:8.867
V-T magnitude:8.329

目录:
适当名称   (Edit)
HD 1989HD 30744
TYCHO-2 2000TYC 5899-818-1
USNO-A2.0USNO-A2 0675-01729461
HIPHIP 22432

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