慢不规则变星（GCVS将之区分为L、LB、和LC三种类型）是在很不明确的展示周期中缓慢改变光排放量的变星。这种变星大多数都是晚期的K、M光谱类型，或是S-型星和碳星。LB-型通常都是巨星，而LC-型是展示出光度变化大约是1星等的超巨星 [1]。
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