Magnetic activities on two single-lined RS Canum Venaticorum binaries IM Pegasi and σ Geminorum
arxiv(2024)
摘要
We present the study on continuous high-resolution spectroscopic observations
of two long-period single-lined RS Canum Venaticorum (RS CVn) binary stars IM
Pegasi (IM Peg) and σ Geminorum (σ Gem), obtained with the
Hertzsprung SONG telescope during the 2015-2016 season. Chromospheric activity
indicators H_α, Na I D_1, D_2 doublet, He I D_3, and
H_β lines have been analyzed by using the spectral subtraction
technique. The expected chromospheric emission features in the H_α, Na
I D_1, D_2 doublet, and H_β lines confirm that both of two
stars are very active systems. In the spectra, the He I D_3 line had been
always detected in absorption feature. Although the behavior of chromospheric
activity indicators is very similar for both stars, the activity level of IM
Peg is much stronger than that of σ Gem. Moreover, the EW variations of
the H_α, He I D_3, and H_β line subtractions correlate
well and show different behavior among different orbital cycles, which
indicates the presence and evolution of activity longitudes over the surface of
two stars. Furthermore, the subtracted H_α line profile is usually
asymmetric. The red-shifted excess absorption features could be interpreted as
a strong down-flow of cool absorbing material, while the blue-shifted emission
component is probably caused by up-flow of hot materials through microflare
events.
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