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HD 425


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Do the physical properties of Ap binaries depend on their orbital elements?
We reveal sufficient evidence that the physical characteristics of Apstars are related to binarity. The Ap star peculiarity [represented bythe Δ(V1-G) value and magnetic field strength] diminishes witheccentricity, and it may also increase with orbital period(Porb). This pattern, however, does not hold for largeorbital periods. A striking gap that occurs in the orbital perioddistribution of Ap binaries at 160-600d might well mark a discontinuityin the above-mentioned behaviour. There is also an interestingindication that the Ap star eccentricities are relatively lower thanthose of corresponding B9-A2 normal binaries for Porb>10d.All this gives serious support to the pioneering idea of Abt &Snowden concerning a possible interplay between the magnetism of Apstars and their binarity. Nevertheless, we argue instead in favour ofanother mechanism, namely that it is binarity that affects magnetism andnot the opposite, and suggest the presence of a newmagnetohydrodynamical mechanism induced by the stellar companion andstretching to surprisingly large Porb.

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Osservazione e dati astrometrici

Costellazione:Balena
Ascensione retta:00h08m49.14s
Declinazione:-07°53'49.4"
Magnitudine apparente:8.776
Distanza:1030.928 parsec
Moto proprio RA:40.6
Moto proprio Dec:-2.5
B-T magnitude:9.948
V-T magnitude:8.873

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 425
TYCHO-2 2000TYC 5260-73-1
USNO-A2.0USNO-A2 0750-00034151
HIPHIP 711

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