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HD 449


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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.

Effects of rotation in the colour-magnitude diagrams of Praesepe and the Hyades.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971MNRAS.151..463S&db_key=AST

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Osservazione e dati astrometrici

Costellazione:Pesci
Ascensione retta:00h09m02.85s
Declinazione:+09°50'59.9"
Magnitudine apparente:8.574
Distanza:95.602 parsec
Moto proprio RA:125.6
Moto proprio Dec:2.3
B-T magnitude:9.414
V-T magnitude:8.644

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 449
TYCHO-2 2000TYC 594-243-1
USNO-A2.0USNO-A2 0975-00032675
HIPHIP 733

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