4562965
doi
10.5281/zenodo.4562965
oai:zenodo.org:4562965
user-coolstars20half
Wolk, Scott
Leitzinger, Martin
Institute of Physics/IGAM, University of Graz, Austria
Guenther, Eike W.
Thüringer Landessternwarte Tautenburg, Germany
Heinzel, Petr
Astronomical Institute, Czech Academy of Sciences, Ondřejov, Czech Republic
Constraining stellar CME occurrence with optical spectroscopy
Odert, Petra
Institute of Physics/IGAM, University of Graz, Austria
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
Cool Stars on the main sequence
<p>Our 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.</p>
Zenodo
2021-02-25
info:eu-repo/semantics/conferencePoster
4562964
user-coolstars20half
award_title=CME activity of the Sun in different evolutionary stages; award_number=P 30949; funder_id=013tf3c58; funder_name=FWF Austrian Science Fund;
1614299250.40361
928761
md5:f6cab711d183d4b533b7381952f234a0
https://zenodo.org/records/4562965/files/poster_cs205_odert.pdf
public
10.5281/zenodo.4562964
isVersionOf
doi