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词汇
BY Dra star
释义
BY Dra star
天龙BY型星;光谱型为K和M的带发射线的矮星;有准周期光变;光变幅小于 0.5目视星等;周期通常从短于1天至几天;光变曲线的形状在变化;表面有黑子活动。
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更新时间:2025/5/24 23:19:21