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X-RAY FLARES AND MASS OUTFLOWS DRIVEN BYMAGNETIC INTERACTION BETWEEN A PROTOSTAR AND ITS SURROUNDING DISK 

作成者 松元, 亮治
キーワード等 stars: activity, stars: pre-main sequence, ISM: jets and outflows, accretion, accretion disks, MHD
日本十進分類法 (NDC) 440
内容 We propose a model of hard X-ray ares in protostars observed by ASCAsatellite. Assuming that the dipole magnetic eld of the protostar threads theprotostellar disk, we carried out 2.5-dimensional magnetohydrodynamic (MHD)simulations of the disk-star interaction. The closed magnetic loops connectingthe central star and the disk are twisted by the rotation of the disk. As thetwist accumulates, magnetic loops expand and nally approach to the open eldconguration. A current sheet is formed inside the expanding loops. In thepresence of resistivity, magnetic reconnection takes place in the current sheet.Outgoing magnetic island and post are loops are formed as a result of thereconnection. The time scale of this `are' is the order of the rotation periodof the disk. The released magnetic energy partly goes into the thermal energyand heats up the aring plasma up to 108 K. The length of the aring loopis several times of the radius of the central star, consistent with observations.The speed of the hot plasmoid ejected by the reconnection is 200 when the footpoint of the loop is at 0.03 AU from 1 M protostar. The hotplasma outow can explain the speed and mass ow rate of optical jets. Dense,cold, magnetically accelerated wind (v 150
日付 1996-06
コンテンツの種類 プレプリント Preprint
DCMI資源タイプ text
ファイル形式 application/pdf
ハンドルURL http://mitizane.ll.chiba-u.jp/meta-bin/mt-pdetail.cgi?cd=00020210
フルテキストへのリンク http://mitizane.ll.chiba-u.jp/metadb/up/joho/matsumoto_9606157X.pdf
言語 英語


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stars: activity
stars: pre-main sequence
ISM: jets and outflows
accretion, accretion disks
MHD