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HD 164731


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관련 글

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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관측 및 측정 데이터

별자리:헤르쿨레스자리
적경:18h01m52.04s
적위:+20°08'40.9"
가시등급:8.289
거리:121.065 파섹
적경상의 고유운동:-7.3
적위상의 고유운동:-9.9
B-T magnitude:8.723
V-T magnitude:8.325

천체목록:
일반명
HD 1989HD 164731
TYCHO-2 2000TYC 1562-943-1
USNO-A2.0USNO-A2 1050-09562708
HIPHIP 88296

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