Publications (10)
Multiple views of magnetism in cool stars
J. Morin, M. Jardine, A. Reiners +9
Magnetic fields are regarded as a crucial element for our understanding of stellar physics. They can be studied with a variety of methods which provide complementary - and sometime…
Estimates of Active Region Area Coverage through Simultaneous Measurements of He I 5876 and 10830 Lines
V. Andretta, M. S. Giampapa, E. Covino +2
Simultaneous, high-quality measurements of the neutral helium triplet features at 5876~Ã and 10830~Ã , respectively, in a sample of solar-type stars are presented. The observations…
Transverse component of the magnetic field in the solar photosphere observed by Sunrise
S. Danilovic, B. Beeck, A. Pietarila +12
We present the first observations of the transverse component of photospheric magnetic field acquired by the imaging magnetograph Sunrise/IMaX. Using an automated detection method,…
Towards a dynamical mass of a PG 1159 star: radial velocities and spectral analysis of SDSS J212531-010745
B. Beeck, S. Schuh, T. Nagel +1
The evolutionary scenarios which are commonly accepted for PG 1159 stars are mainly based on numerical simulations, which have to be tested and calibrated with real objects with kn…
Aspects of Multi-Dimensional Modelling of Substellar Atmospheres
Ch. Helling, E. Pedretti, S. Berdyugina +6
Theoretical arguments and observations suggest that the atmospheres of Brown Dwarfs and planets are very dynamic on chemical and on physical time scales. The modelling of such subs…
Simulations of the solar near-surface layers with the CO5BOLD, MURaM, and Stagger codes
B. Beeck, R. Collet, M. Steffen +6
Radiative hydrodynamic simulations of solar and stellar surface convection have become an important tool for exploring the structure and gas dynamics in the envelopes and atmospher…