CCD {Delta}a-photometry of 5 open clusters
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The time scale on which chemical peculiarity in upper main sequence stars begins is unknown. Results from the Hipparcos measurements indicate that the classical chemically...
上主序星的化学反常现象起始的时间尺度目前尚未明确。依巴谷（Hipparcos）卫星的测量结果表明，经典化学……
