Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Nickeler, Dieter H."'
Autor:
Kraus, Michaela, Kourniotis, Michalis, Arias, Maria Laura, Torres, Andrea F., Nickeler, Dieter H.
Publikováno v:
Galaxies, 11, 76 (2023)
Massive stars expel large amounts of mass during their late evolutionary phases. We aim to unveil the physical conditions within the warm molecular environments of B[e] supergiants (B[e]SGs) and yellow hypergiants (YHGs), which are known to be embedd
Externí odkaz:
http://arxiv.org/abs/2306.10911
Autor:
Kraus, Michaela, Liimets, Tiina, Moiseev, Alexei, Arias, Julieta P. Sanchez, Nickeler, Dieter H., Cidale, Lydia S., Jones, David
The Galactic B[e] supergiant MWC 137 is surrounded by a large-scale optical nebula. To shed light on the physical conditions and kinematics of the nebula, we analyze the optical forbidden emission lines [NII] 6548,6583 and [SII] 6716,6731 in long-sli
Externí odkaz:
http://arxiv.org/abs/2106.15981
In this work we describe a numerical optimization method for computing stationary MHD-equilibria. The newly developed code is based on a nonlinear force-free optimization principle. We apply our code to model the solar corona using synoptic vector ma
Externí odkaz:
http://arxiv.org/abs/2010.02945
Topological characteristics reveal important physical properties of plasma structures and astrophysical processes. Physical parameters and constraints are linked with topological invariants, which are important for describing magnetic reconnection sc
Externí odkaz:
http://arxiv.org/abs/1901.09913
Autor:
Kraus, Michaela, Kolka, Indrek, Aret, Anna, Nickeler, Dieter H., Maravelias, Grigoris, Eenmäe, Tõnis, Lobel, Alex, Klochkova, Valentina G.
Yellow hypergiants are evolved massive stars that were suggested to be in post-red supergiant stage. Post-red supergiants that evolve back to the blue, hot side of the Hertzsprung-Russell diagram can intersect a temperature domain in which their atmo
Externí odkaz:
http://arxiv.org/abs/1812.03065
Autor:
Kraus, Michaela, Liimets, Tiina, Cappa, Cristina E., Cidale, Lydia S., Nickeler, Dieter H., Duronea, Nicolas U., Arias, Maria L., Gunawan, Diah S., Oksala, Mary E., Fernandes, Marcelo Borges, Maravelias, Grigoris, Cure, Michel, Santander-Garcia, Miguel
The Galactic object MWC 137 was suggested to belong to the group of B[e] supergiants. However, with its large-scale optical bipolar ring nebula and the high velocity jet and knots, it is a rather atypical representative of this class. We performed mu
Externí odkaz:
http://arxiv.org/abs/1709.06439
Many magnetic structures in the solar atmosphere evolve rather slowly so that they can be assumed as (quasi-)static or (quasi-)stationary and represented via magneto-hydrostatic (MHS) or stationary magneto-hydrodynamic (MHD) equilibria, respectively.
Externí odkaz:
http://arxiv.org/abs/1702.03986
Akademický článek
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Publikováno v:
ASTRA Proc. 1 (2014) 51-60
The geometrical shapes and the physical properties of stellar wind -- interstellar medium interaction regions form an important stage for studying stellar winds and their embedded magnetic fields as well as cosmic ray modulation. Our goal is to provi
Externí odkaz:
http://arxiv.org/abs/1501.05122
Autor:
Kraus, Michaela, Nickeler, Dieter H., Haucke, Maximiliano, Cidale, Lydia, Venero, Roberto, Fernandes, Marcelo Borges, Tomic, Sanja, Cure, Michel
During the post-main sequence evolution massive stars pass through several short-lived phases, in which they experience enhanced mass loss in the form of clumped winds and mass ejection events of unclear origin. The discovery that stars populating th
Externí odkaz:
http://arxiv.org/abs/1309.4904