Atmospheric dynamics and shock waves in RR Lyr - II. Helium emission occurrence

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Table 2

Summary of the occurrence of emission lines of Hα, He I 5875 Å, and He II 4686 Å.

Years	Nights with Hα emission	Nights with He I emission	Nights with He I 2nd emission	Nights with He II emission
1994-1997	19	10+(1)	17	2+(2)

Notes. Summary of the occurrence of emission lines (Hα, He I 5875 Å, and He II 4686 Å) observed in each of the pulsation cycles during the 1994-1997 campaign near the phase of maximum Hα emission (φ ≃ 0.92). The numbers in parentheses means that the visibility of the emission was blurred.

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