138 citations · 255 across the 8 of their papers we have counts for
6 papers · 1 filter
Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E
Jiri Krticka, Jiri Kubat, Detlef Groote
We study the possibility of the helium decoupling in the stellar wind of sigma Ori E. To obtain reliable wind parameters for this star we first calculate an NLTE wind model and der…
The Rigidly Rotating Magnetosphere of Sigma Ori E
R. H. D. Townsend, S. P. Owocki, D. Groote
We attempt to characterize the observed variability of the magnetic helium-strong star sigma Ori E in terms of a recently developed rigidly rotating magnetosphere model. This model…
Discovery of X-ray flaring on the magnetic Bp-star sigma Ori E
D. Groote, J. H. M. M. Schmitt
We report the detection of an X-ray flare on the Bp star sigma Ori E with the ROSAT high resolution imager (HRI). The flare is shown to have likely occurred on the early-type star,…
Wind Circulation in Selected Rotating Magnetic Early-B Stars
Myron A. Smith, Detlef Groote
The rotating magnetic B stars have oblique dipolar magnetic fields and often anomalous helium and metallic compositions. These stars develop co-rotating torus-shaped clouds by chan…
Patchy intergalactic HeII absorption in HE 2347-4342. - The possible discovery of the epoch of He-reionization
D. Reimers, S. Koehler, L. Wisotzki +3
We report on observations of redshifted HeII 304 A absorption in the QSO HE 2347-4342 (z=2.885, V=16.1) with the GHRS on board HST (FWHM=0.7 A). At the expected position of HeII 30…
The local luminosity function of QSOs and Seyfert 1 nuclei
T. Koehler, D. Groote, D. Reimers +1
We present the analysis of a new flux-limited sample of bright quasars and Seyfert 1 galaxies in an effective area of 611 square deg, drawn from the Hamburg/ESO survey. We confirm…