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Chromospheric Activity of Periodic Variable Stars Based on the LAMOST Low- and Medium-resolution Spectral Survey
2021 The Astrophysical Journal Supplement Series 253
Caption: Figure 10.
Ratio of maximum and minimum EWs of Hα lines, R(EWHα), plotted against spectral type. The inset shows the mean values of R(EWHα) as a function of spectral type.
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