A star whose magnetic field strength changes over time. In 1946, H. Babcock discovered the Zeeman effect in the spectrum of 78 Virgo. Since then, magnetic fields have been detected in over 100 stars. Many of these have a magnetic field whose polarity reverses or whose strength changes with a period of about 10 days. The double star Cor Caroli, alpha Canes Venatici, exhibits a magnetic field that varies from -1400 G (gauss) to 1600 G with a period of 5.5 days. HD215441 in Lacerta has been observed to have the strongest magnetic field, at 34,400 G. White dwarfs and neutron stars are thought to have even stronger magnetic fields. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
磁場の強さが時間によって変化する星。 1946年 H.バブコックは,おとめ座 78番星のスペクトルにゼーマン効果が存在することを発見した。その後,100以上の星に磁場が検出されている。その多くは 10日程度の周期で磁場極性が逆転したり,強さが変化する。りょうけん座α星の二重星コル・カロリは,周期 5.5日で-1400G (ガウス) から 1600Gにいたる変動を示す。とかげ座の HD215441は最強の磁場3万 4400Gが観測されている。白色矮星や中性子星はさらに強い磁場をもっていると思われている。
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