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HD 172128


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Evidence of decay of the magnetic fields of AP stars
Data obtained in the Geneva photometric system (Rufener, 1981) andappropriate calibrations of this system in terms of surface magneticfield and gravity are used to provide, on the basis of 708 field andcluster Ap stars, observational evidence that these stars undergo decayof their magnetic field on an evolutionary timescale. Justifications aregiven for the application of a photometric gravity calibration topeculiar stars. The dependence of the photometrically estimated surfacemagnetic field on gravity is found to differ markedly from availabletheoretical calculations. HgMn stars are found to show the same trend,strengthening the impression that they might be slightly magnetic.He-weak stars do not.

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观测天体数据

星座:望遠鏡座
右阿森松:18h40m43.89s
赤纬:-47°01'38.1"
视星:6.808
距离:135.318 天文距离
右阿森松适当运动:-5.8
赤纬适当运动:11.2
B-T magnitude:6.889
V-T magnitude:6.815

目录:
适当名称   (Edit)
HD 1989HD 172128
TYCHO-2 2000TYC 8364-777-1
USNO-A2.0USNO-A2 0375-36198247
HIPHIP 91589

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