作者: Tomokazu Kogure , Kam-Ching Leung
DOI: 10.1007/978-0-387-68995-1_6
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摘要: Late-type stars are generally characterized by the chromospheric structure showing active phenomena observable formation of emission lines and X-ray UV radiations. In optical region, most ubiquitous CaII H, K lines, while Hα line appears in fully developed chromospheres. this section we consider basic activities focusing to lines.