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HD 164731


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A photometric study of BL Herculis
Photometric observations of the prototype variable BL Her are described.The reddening, metallicity, temperature, and surface gravity of the starare determined. A Baade-Wesselink analysis is made to determine theradius and distance to the variable. The mass of the star is determinedto be 0.75 solar, placing it in the range of RR Lyrae variables. Themetallicity of +0.20, however, is greater than that of any known RRLyrae variable.

Revised photometric properties for the multiperiodic variable HD 200925
The spectroscopic data collected on the HD 200925 variable star in theuvby and beta systems have been analyzed. The results indicate that thisvariable is multiperiodic, with a reddening value, E(b-y), equal to0.029 mag. The reddening-corrected normals for y, (b-y), and c(1)yielded a mean effective temperature of 7020 K, mean log surface gravityof 3.44, and a mean bolometric magnitude of 0.8 mag. A preliminary meanradius of 4.1 solar radii has been determined. The m(1) data show thatthe blanketing is high, but this index varied in an anomalous way whichprecluded a definitive determination of Fe/H. Two possible explanationsare considered for the behavior of the m(1) index: (1) a highmicroturbulence excited by the secondary pulsation mode, and (2) theAm/Fm phenomenon.

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观测天体数据

星座:武仙座
右阿森松:18h01m52.04s
赤纬:+20°08'40.9"
视星:8.289
距离:121.065 天文距离
右阿森松适当运动:-7.3
赤纬适当运动:-9.9
B-T magnitude:8.723
V-T magnitude:8.325

目录:
适当名称   (Edit)
HD 1989HD 164731
TYCHO-2 2000TYC 1562-943-1
USNO-A2.0USNO-A2 1050-09562708
HIPHIP 88296

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