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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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Observation and Astrometry data

Constellation:Telescopium
Right ascension:18h40m43.89s
Declination:-47°01'38.1"
Apparent magnitude:6.808
Distance:135.318 parsecs
Proper motion RA:-5.8
Proper motion Dec:11.2
B-T magnitude:6.889
V-T magnitude:6.815

Catalogs and designations:
Proper Names
HD 1989HD 172128
TYCHO-2 2000TYC 8364-777-1
USNO-A2.0USNO-A2 0375-36198247
HIPHIP 91589

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