It is shown that W UMa-type and SX Phe-type stellar populations are both perfectly and uniquely suited for maintaining hyper-effective biopolymer chain reactions (BCR) on their planets once the planet is in the stellar habitable zone. W UMa-type stars are known to be contact binaries, and SX Phe-type stars are presumably post-binaries, i.e., products of stellar mergers. In case of the contact binaries, the eclipse-driven periodic heating/cooling of planetary surfaces has period-amplitude parameters that perfectly satisfy stringent conditions for maintaining BCR-like reactions. In case of the post-binaries, the stars pulsate with periods and amplitudes also perfectly suited for maintaining the reactions. Therefore, the ‘W UMa – SX Phe’ metamorphosis (from a contact binary to a post-binary, via the merger) seems to provide a potential biosystem reboot on planets in these systems.

中文翻译：

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合并恒星的宜居世界

结果表明，一旦行星处于恒星宜居带，W UMa 型和 SX Phe 型恒星种群都非常适合在其行星上维持超有效的生物聚合物链式反应 (BCR)。已知 W UMa 型恒星是接触双星，而 SX Phe 型恒星可能是后双星，即恒星合并的产物。在接触双星的情况下，日食驱动的行星表面周期性加热/冷却具有完全满足维持类 BCR 反应的严格条件的周期幅度参数。在后双星的情况下，恒星以周期和幅度脉动也非常适合维持反应。因此，“W UMa – SX Phe”变态（从接触二进制到后二进制，