ヘルクレス座SX星

ヘルクレス座SX星（ヘルクレスざSXせい）は、ヘルクレス座の方向に位置する脈動変光星。

概要

SRD型の半規則型変光星で[1][2]、7.9等と9.3の間を変光する[2]。周期は変光星総合カタログでは102.90日としているが[1]、アメリカ変光星観測者協会では103.5日としている[2]。ヘルクレス座SX星が属するSRD型は半規則型変光星といっても赤色巨星からなるSRA型やSRB型、赤色超巨星からなるSRC型とは異なるタイプの変光星であり[3][4]、スペクトル型がF型からK型の黄色巨星ないし黄色超巨星である[3][4]。ヘルクレス座SX星も変光に伴いスペクトル型がG3ep-K0の間を変化する黄色い星である[1][2]。但し極小期にはスペクトル型がM3になったこともある[1][2]。変光星総合カタログではこの星はおおぐま座SV星とともにSRD型の代表星とされている[5]。

名称

学名はSX Herculis（略称：SX Her）、ボン掃天星表の番号はBD+25°3031[1][2]、ヘンリー・ドレイパーカタログの番号はHD 144921[1][2]。

脚注・出典

[脚注の使い方]
  1. ^ a b c d e f GCVS Query = SX Her - 変光星総合カタログ内のページ。
  2. ^ a b c d e f g VSX : Detail for SX Her - アメリカ変光星観測者協会公式サイト内のページ。
  3. ^ a b 清田誠一郎「変光星ガイド・4月」、『天文ガイド』1986年4月号、誠文堂新光社、134頁。
  4. ^ a b 渡辺努「OBSERVER'S GUIDE 変光星」、『月刊天文』2002年11月号、地人書館、98頁。
  5. ^ GCVS Variability Types and Distribution Statistics of Designated Variable Stars According to their Types of Variability - 変光星総合カタログ内のページ。

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