Searching for flares and CME signatures in the spectra of seven cool stars

Searching for and investigating coronal mass ejections (CMEs) from late-type stars is important for understanding stellar activity and its effects on the stellar evolution, space weather and exoplanet atmospheres. To this end, we performed spectroscopic observations of 4 stars of spectral type K, one M dwarf and two solar-like stars in several epochs with the NOT/ALFOSC at La Palma and the 2-m RCC telescope/ESPERO of The National astronomical observatory Rozhen. We obtained 350 spectra from three consecutive nights in 2012 from ALFOSC and 159 spectra from ESPERO during 2020 and 2021. The resulting dynamic spectra do not show evidence for flares and/or CMEs. In addition, we obtained radial velocities for the stars, which we compare with those from previous investigations.

Bulgarian National Science Fund under contract DN 18/13-12.12.2017

Related Organizations

Bulgarian Academy of Sciences
Bulgaria
Institute of Astronomy and National Astronomical Observatory
Bulgaria

Keywords

stars: magnetic activity; stars: coronal mass ejection; stars: cool stars

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