O. Stahl

Publications243
h-index35
Citations3,982
Highly Influential Citations354
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The periodicity of the η Carinae events
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, when…
Commissioning FEROS, the new high-resolution spectrograph at La Silla.
Various calibration procedures are performed for trend analysis purposes; they are mainly used by the instrument scientist. They include a control of the slit position with respect to the detector,…
A spectroscopic survey on the multiplicity of high-mass stars
The formation of stars above about 20 M⊙ and their apparently high multiplicity remain heavily debated subjects in astrophysics. We have performed a vast high-resolution radial velocity spectroscopic…
Successful Commissioning of FORS1 - the First Optical Instrument on the VLT
FORS, the FOcal Reducer/low dispersion Spectrograph, was the first VLT instrument to be designed and built outside ESO. Following a Call for Proposals in 1990, the contract to realise the project was…
Long-term spectroscopic monitoring of the Luminous Blue Variable AG Carinae
We have extensively monitored the Luminous Blue Variable AG Car (HD 94910) spectroscopically. Our data cover the years 1989 to 1999. In this period, the star underwent almost a full S Dor cycle from…
RX J0806.3+1527: A double degenerate binary with the shortest known orbital period (321s)
We carried out optical observations of the field of the X–ray pulsator RX J0806.3+1527. A blue $V =$ 21.1 star was found to be the only object consistent with the X–ray position. VLT FORS spectra…
A multispectral view of the periodic events in η Carinae
A full description of the 5.5-yr low excitation events in η Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first,…
Variable and non-spherical stellar winds in luminous hot stars : proceedings of the IAU Colloquium no. 169, held in Heidelberg, Germany, 15-19 June, 1998
Part I Observation of non-spherical winds: rotationally modulated winds of O stars rotationally modulated winds of BA-type supergiants using spectropolarimetry to determine envelope geometry and test…
IRC +10420 - A cool hypergiant near the top of the H-R diagram
New data are reported for the OH/IR star IRC+10420, including optical/infrared imaging, spectroscopy, polarimetry, and photometry. We conclude the following: 1. The optical spectrum is that of a very…
CARMENES instrument overview
This paper gives an overview of the CARMENES instrument and of the survey that will be carried out with it during the first years of operation. CARMENES (Calar Alto high-Resolution search for M…
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