Anna Frebel

HE1327-2326在2005年被安娜·弗瑞貝爾（德语：Anna Frebel）和共同研究者發現，是迄今為止所知鐵豐度最低的恆星。這顆恆星是第二族恆星，它的鐵對氫的比率([Fe/H])，或金屬量是-5.6。這個數值表示擁有地球的太陽，其鐵含量是它的300,000倍。但是，它的碳豐度大約是太陽的十分之一，[C/H]=-1

Anthony Ayiomamitis. [2008-02-20]. （原始内容存档于2008-12-11）.  Homepage of Anna Frebel. Anna Frebel. [2008-02-20]. （原始内容存档于2008-12-04）.  Astronomers discover HE 1523-0901

  Evan N. Kirby, Joshua D. Simon, Marla Geha, Puragra Guhathakurta, Anna Frebel. Uncovering Extremely Metal-Poor Stars in the Milky Way's Ultrafaint

  Evan N. Kirby, Joshua D. Simon, Marla Geha, Puragra Guhathakurta, Anna Frebel. Uncovering Extremely Metal-Poor Stars in the Milky Way's Ultrafaint

Chiti, Anirudh; Milone, Antonino P.; Mackey, Dougal; da Costa, Gary; Frebel, Anna; Conn, Blair. PORTRAIT OF A DARK HORSE: PHOTOMETRIC PROPERTIES AND KINEMATICS