Poster Open Access
Constraining stellar CME occurrence with optical spectroscopy
Odert, Petra; Leitzinger, Martin; Guenther, Eike W.; Heinzel, Petr
Editor(s)
Wolk, ScottOur knowledge on coronal mass ejections (CMEs) on stars other than the Sun is still sparse. Spectroscopic observations in the optical sometimes show asymmetrically broadened wings and/or transient extra-emissions in chromospheric lines during or shortly after flare events. These may be interpreted as signatures of prominence eruptions, which are closely related to CMEs on the Sun. Dedicated searches for these signatures have, however, mostly yielded non-detections. Here we present a semi-empirical model which combines predictions of intrinsic stellar CME rates with simple radiative transfer calculations in the Balmer lines. We find that typical observations have most likely been too short and/or they had a too low signal-to-noise ratio to detect CMEs. We predict the minimum observing time needed to detect CMEs in the Balmer lines for stars with different spectral types and activity levels.
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Heinzel, P. (2015) in: Astrophysics and Space Science Library, Vol. 415, Solar Prominences, ed. J.-C. Vial & O. Engvold, 103-130
Labrosse, N., Heinzel, P., Vial, J.-C., et al. (2010) SSR, 151, 243
Odert, P., Leitzinger, M., Guenther, E. W., Heinzel, P. (2020) MNRAS, 494, 3766
Odert, P., Leitzinger, M., Hanslmeier, A., Lammer, H. (2017) MNRAS, 472, 876
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- Publication date:
- February 25, 2021
- DOI:
-
- Keyword(s):
- Cool Stars on the main sequence
- Grants:
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Austrian Science Fund:
- CME activity of the Sun in different evolutionary stages (P 30949)
- Meeting:
- The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5), virtually anywhere, March 2-4, 2021
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International