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HD 7786


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The rotation of AP stars
Photometric periods of silicon stars belonging to clusters andassociations as well as to the field are discussed in relation withtheories of magnetic braking taking place on the main sequence. It isshown that Si stars do not lose the bulk of their angular momentumduring their main-sequence lifetime, but must have lost it before. Anybraking mechanism which predicts an e-folding time of the order of, orshorter than, the star's lifetime seems ruled out. The theory of purelyhydromagnetic rotational braking is much too efficient to fit theobservations (unless under its earlier form proposed by Kulsrud, 1971),while the accretion theory does not fit them either, although it seemsmore realistic. Preinjection of cosmic rays by means of Ap stars appearsdoubtful.

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观测天体数据

星座:玉夫座
右阿森松:01h17m03.33s
赤纬:-30°55'03.8"
视星:8.741
距离:105.708 天文距离
右阿森松适当运动:60.2
赤纬适当运动:-10.5
B-T magnitude:9.337
V-T magnitude:8.791

目录:
适当名称   (Edit)
HD 1989HD 7786
TYCHO-2 2000TYC 7002-135-1
USNO-A2.0USNO-A2 0525-00441026
HIPHIP 5990

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