1995-2000 optical spectra of CH Cyg
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CH Cyg is one of the most studied symbiotic stars. Its properties, however, are still not well known. Two main periods, about 15 years and 750-days, are known in the photometric...
天鹅座CH（CH Cyg）是迄今研究最为广泛的共生星（symbiotic star）之一，但其物理性质仍未得到充分认知。目前已在其测光观测中发现两个主要周期，分别约为15年与750天……
