Modeling Balmer line signatures of stellar CMEs

0558361 - ASÚ 2023 RIV GB eng J - Článek v odborném periodiku
Leitzinger, M. - Odert, P. - Heinzel, Petr
Modeling Balmer line signatures of stellar CMEs.
Monthly Notices of the Royal Astronomical Society. Roč. 513, č. 4 (2022), s. 6058-6073. ISSN 0035-8711. E-ISSN 1365-2966
Grant CEP: GA ČR(CZ) GA22-34841S; GA ČR(CZ) GA19-17102S
Institucionální podpora: RVO:67985815
Klíčová slova: coronal mass ejections * slingshot prominences * flare stars
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 4.8, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1093/mnras/stac1284

From the Sun, we know that coronal mass ejections (CMEs) are a transient phenomenon, often correlated with flares. They have an impact on solar mass- and angular momentum loss, and therefore solar evolution, and make a significant part of space weather. The same is true for stars, but stellar CMEs are still not well constrained, although new methodologies have been established, and new detections presented in the recent past. So far, probable detections of stellar CMEs have been presented, but their physical parameters which are not directly accessible from observations, such as electron density, optical thickness, temperature, etc., have been so far not determined for the majority of known events. We apply cloud modeling, as commonly used on the Sun, to a known event from the literature, detected on the young dMe star V374 Peg. This event manifests itself in extra emission on the blue side of the Balmer lines. By determining the line source function from 1D NLTE modeling together with the cloud model formulation, we present distributions of physical parameters of this event. We find that except for temperature and area all parameters are at the upper range of typical solar prominence parameters. The temperature and the area of the event were found to be higher than for typical solar prominences observed in Balmer lines. We find more solutions for the filament than for the prominence geometry. Moreover, we show that filaments can appear in emission on dMe stars contrary to the solar case.
Trvalý link: http://hdl.handle.net/11104/0332246