劍魚座γ型變星

劍魚座γ型變星是一種由表面非徑向脈動造成亮度變化的變星。這種變星通常是年輕的前端F或後端A型主序星，以「日」的數量級為週期，亮度在0.1星等內變化。這是一種相對來說較新類型的變星，其特徵在1990年代後半期才首度被注意到，詳細的物理原因和變化還在研究之中這種變星的原型是劍魚座γ。 八谷六（御夫9）這顆恆星於1990年首次被發現是顆變星。然而，當時公認的解釋都不充分：儘管注意到與劍魚座γ和HD 96008相似，但它的脈動太慢，又在盾牌座δ型變星的不穩定帶之外，並且沒有證據表明有任何星食的物質。這三顆恒星，以及HD 224638，很快被假設屬於一類新的變星，其中的變化是由g模式產生，而不是由盾牌座δ型變星的p模式脈動產生。此外，注意到HD 224945和HD 164615也有相似的變化，而HD 96008則因其週期更規律而被排除在外。星食和星斑很快被排除為劍魚座γ型變星變異的原因，一年後，「八谷六」的變異性被證實是由g模式脈動引起的，從而證實這些恆星是一類新變星的原型。很快又找到了十多顆這種變星的候選者，於是將這種變星以第一批發現的最亮成員命名為劍魚座γ型變星。 MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021].  Krisciunas, K.; Aspin, C.; Geballe, T. R.; Akazawa, H.; Claver, C. F.; Guinan, E. F.; Landis, H. J.; Luedeke, K. D.; Ohkura, N.; Ohshima, O.; Skillman, D. R. The 9-AURIGAE System. Monthly Notices of the Royal Astronomical Society. 1993, 263 (3): 781. Bibcode:1993MNRAS.263..781K. arXiv:astro-ph/9304008 . doi:10.1093/mnras/263.3.781.  Krisciunas, K. A new class of pulsating stars. 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