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HD 101180


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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:Leo
Right ascension:11h38m45.57s
Declination:+15°25'09.6"
Apparent magnitude:8.58
Distance:408.163 parsecs
Proper motion RA:-41.8
Proper motion Dec:4
B-T magnitude:10.334
V-T magnitude:8.725

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 101180
TYCHO-2 2000TYC 1438-499-1
USNO-A2.0USNO-A2 1050-06550156
HIPHIP 56810

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