Thomas Eversberg

TL;DR: In this paper, the authors present time series of ultra-high S/N, high-resolution spectra of the He II 4686 emission line in the O4I(n)f supergiant ζ Puppis, the brightest early-type O star in the sky.

TL;DR: In this paper, an expression for the error of the line equivalent width σ (Wλ) with respect to pure photon noise statistics was derived and a correction value for previous calculations was provided.

TL;DR: In this article, a constrained non-linear light-curve inversion algorithm was used to trace the locations of the bright surface spots and traced their evolution in the O4I(n)fp star ζ Puppis, showing signatures of corotating interaction regions that turn out to be driven by the bright photospheric spots observed by BRITE.

TL;DR: In this article, an expression for the error of the line equivalent width with respect to pure photon noise statistics was derived, and a correction value for previous calculations was provided for previous errors.

TL;DR: In this paper, a multisite photometric and spectroscopic observations of WN8 stars were carried out in 1989 and 1994-1995 to investigate the role of the stellar core in restructuring the whole wind.