けんびきょう座AU星とは - わかりやすく解説 Weblio辞書

けんびきょう座AU星

出典: フリー百科事典『ウィキペディア（Wikipedia）』 (2023/11/18 21:26 UTC 版)

けんびきょう座AU星（けんびきょうざAUせい、AU Microscopii、AU Mic）は、けんびきょう座の方角に、太陽から約31.7光年の距離にある小さな恒星である^[3]^[5]。けんびきょう座AU星の視等級は8.73等で、肉眼でみることはできない^[1]。けんびきょう座AU星という名称は、変光星の命名規則に基づいて付与されたものである^[8]。がか座β星のように、けんびきょう座AU星は星周領域に残骸円盤（英語版）を持っている^[5]。

脚注

注釈

^ ^a ^b パーセクは1 ÷ 年周視差（秒）より計算、光年は1÷年周視差（秒）×3.2615638より計算
^ 視等級 + 5 + 5×log（年周視差（秒））より計算。小数第1位まで表記
^ ハッブル宇宙望遠鏡の観測結果によれば、中心星からの距離を $b{\mbox{[AU]}}$ で表すと、散乱光の面輝度は、 $b<15$ ではほぼ一定、 $15\lesssim b\lesssim 43$ では $\propto b^{-1.8}$ に従い、 $b\gtrsim 43$ では $\propto b^{-4.7}$ に従うと推定される。

出典

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