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牧夫座λ型星是表面層鐵峰頂元素異常低的一種特殊恆星。一個可能的解釋是，這是從它金屬低的星周盤吸積的結果。它的原型是牧夫座λ星。
- Paunzen, Ernst. The λ Bootis stars. Zverko, J.; Ziznovsky, J.; Adelman, S.J.; Weiss, W.W. (编). The A-Star Puzzle. IAU Symposium, No. 224. 2004 [2008-11-16]. ISBN 0521850185. （原始内容存档于2016-08-11）.
- Gray, R.O. and Corbally, C.J. A Spectroscopic Search for λ Bootis and Other Peculiar A-Type Stars in Intermediate-Age Open Clusters. The Astronomical Journal. 2002, 124 (2): 989–1000. Bibcode:2002AJ....124..989G. doi:10.1086/341609.
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