204 citations · 1.3k across the 32 of their papers we have counts for
14 papers · 1 filter
A hydrodynamic scheme for two-component winds from hot stars
V. Votruba, A. Feldmeier, J. Kubát +1
We have developed a time-dependent two-component hydrodynamics code to simulate radiatively-driven stellar winds from hot stars. We use a time-explicit van Leer scheme to solve the…
Neglecting the porosity of hot-star winds can lead to underestimating mass-loss rates
L. M. Oskinova, W. -R. Hamann, A. Feldmeier
Context: The mass-loss rate is a key parameter of massive stars. Adequate stellar atmosphere models are required for spectral analyses and mass-loss determinations. Present models…
A Nozzle Analysis of Slow-Acceleration Solutions in One-Dimensional Models of Rotating Hot-Star Winds
Thomas I. Madura, Stanley P. Owocki, Achim Feldmeier
We analyze the steady 1D flow equations for a rotating stellar wind based on a ``nozzle'' analogy for terms that constrain the local mass flux. For low rotation, we find the nozzle…
Quantitative X-ray spectroscopy of massive stars
L. M. Oskinova, W. -R. Hamann, A. Feldmeier
Radiative transfer in a clumped winds is used to describe X-ray emission line profiles observed in the XMM-Newton RGS spectrum of the OI star Zeta Puppis. It is shown that this X-r…
High resolution X-ray spectroscopy of bright O type stars
L. M. Oskinova, A. Feldmeier, W. -R. Hamann
Archival X-ray spectra of the four prominent single, non-magnetic O stars Zeta Pup, Zeta Ori, Ksi Per and Zeta Oph, obtained in high resolution with Chandra HETGS/MEG have been stu…
O Star X-ray Line Profiles Explained by Radiation Transfer in Inhomogeneous Stellar Wind
L. M. Oskinova, A. Feldmeier, W. -R. Hamann
It is commonly adopted that X-rays from O stars are produced deep inside the stellar wind, and transported outwards through the bulk of the expanding matter which attenuates the ra…