Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..107....1s&link_type=abstract
Astronomy and Astrophysics Suppl. 107, 1-8 (1994)
Astronomy and Astrophysics
Astrophysics
16
Stars: P Cygni, Activity, Mass Loss, Supergiants
Scientific paper
We have monitored P Cygni from 1990 to 1992 with a fiber-linked echelle spectrograph and a CCD detector. The spectra cover the wavelength range 4050A<λ<6750A with a spectral resolution of λ/{DELTA}λ=~12,000. The S/N-ratio of the spectra depends on wavelength and weather conditions, but typically it is better than 100. Due to the linear detector, we cannot only study radial velocities, but also the line strengths with good precision. We found variations in radial velocity of about 30 to 50km/s and line strength variations of the order of 30%. The typical timescales of the variations are months. Clear line splittings have not been found in our data.
Gaeng Thomas
Kaufer Andreas
Mandel Holger
Stahl Otmar
Szeifert Thomas
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