Looking for flares and CME signatures in the spectra of several cool stars

It is critical to look for and estimate CME and flare signatures from late-type stars in order to understand stellar activity and its impact on space weather and planetary atmospheres. Spectroscopic observations of the Hα Balmer line is one of the methods. We present spectroscopic observations of four stars of spectral types G, K, and M. The observations were made over a number of epochs using the NOT/ALFOSC on La Palma and the 2-m RCC telescope/ESPERO at the National Astronomical Observatory of Rozhen. In April, July, and September of 2021, we collected 303 spectra over six nights. With the ALFOSC instrument, we obtained 168 spectra, and the ESPERO instrument, we obtained 135 spectra. The results do not show the events we are looking for, which raises concerns.

This research is based on activities supported by the Bulgarian National Science Fund under contract DN 06-Н58/3 – 16.11.2021.

Related Organizations

Institute of Astronomy and National Astronomical Observatory
Bulgaria

Keywords

cool stars, magnetic activity, coronal mass ejection

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