Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.14365/894
Title: | Chromospheric activity in epsilon Eridani: results from theoretical wave studies | Authors: | Fawzy, Diaa E. Cuntz, M. |
Keywords: | Methods: numerical Shock waves Stars: activity Stars: individual: epsilon Eridani Stars: magnetic field Stars: chromospheres Time-Dependent Ionization Flux-Tube Waves Late-Type Stars Stellar Convection Zones Main-Sequence Stars Basal Ca Ii Solar Chromosphere Magnetic Activity Partial Redistribution K-Dwarfs |
Publisher: | Springer | Abstract: | This work discusses theoretical models of chromospheric heating for Eridani by shock waves. Self-consistent, nonlinear and time-dependent ab-initio numerical computations for the excitation of the atmosphere (i.e., arrays of flux tubes) are pursued based on waves generated in stellar convective zones. Based on previous studies the magnetic filling factor is estimated according to the stellar rotational period, although general models are described as well. The Ca II H+K fluxes are computed assuming partial redistribution (PRD). Time-dependent ionization notably affects the resulting Ca II fluxes, as expected. The emergent Ca II H+K fluxes are based on two-component models, consisting of a dominant magnetic component (as given by longitudinal tube waves) and a subordinate acoustic component. The Ca II fluxes as obtained are smaller by about a factor of 2 than those given by observations. Possible reasons for this discrepancy include (1) inherent limitations of our theoretical approach as it is based on 1-D rather than 3-D modelling and/or (2) the existence of additional heating processes in Eridani (a young star) not included here. | URI: | https://doi.org/10.1007/s10509-018-3373-3 https://hdl.handle.net/20.500.14365/894 |
ISSN: | 0004-640X 1572-946X |
Appears in Collections: | Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
Files in This Item:
File | Size | Format | |
---|---|---|---|
894.pdf Restricted Access | 1.2 MB | Adobe PDF | View/Open Request a copy |
CORE Recommender
SCOPUSTM
Citations
3
checked on Oct 2, 2024
WEB OF SCIENCETM
Citations
3
checked on Oct 2, 2024
Page view(s)
58
checked on Sep 30, 2024
Google ScholarTM
Check
Altmetric
Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.