10.5281/zenodo.4562059
https://zenodo.org/records/4562059
oai:zenodo.org:4562059
Magaudda Enza
Magaudda Enza
Institut für Astronomie und Astrophysik, Eberhard-Karls Universität Tübingen, 72076 Tübingen, German
Stelzer Beate
Stelzer Beate
Institut für Astronomie und Astrophysik, Eberhard-Karls Universität Tübingen, 72076 Tübingen, German
Raetz Stefanie
Raetz Stefanie
Institut für Astronomie und Astrophysik, Eberhard-Karls Universität Tübingen, 72076 Tübingen, German
Probing activity and rotation of M dwarfs with X-rays and photometric timeseries
Zenodo
2021
2021-02-25
Poster
10.5281/zenodo.4562058
https://zenodo.org/communities/coolstars20half
Creative Commons Attribution 4.0 International
The activity-rotation relation of M dwarfs provides observational evidence of the stellar dynamo,
which is poorly understood for fully convective stars. It is known that the X-ray activity-rotation
relation has a two-regime behavior with saturation for faster rotating stars and with a Lx decrease
for slower rotation. However, the number of M dwarfs with sensitive X-ray and rotation measure-
ments has for a long time been very limited. New XMM-Newton, Chandra and eROSITA X-ray observations
with K2 mission and TESS rotation periods analyzed in my work have substantially increased the number
of low activity and fast/slow rotation stars that have been dicult to assess in the past. Combining
the new data with a systematic update and homogenization of the literature data has enabled
me to examine the activity-rotation relation in different mass bins within the M dwarf regime.
Several interesting findings emerged, including a non-constant Lx-level in the saturated regime and a
mass-dependence of the slope in the unsaturated regime.