Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ssrv...27..329y&link_type=abstract
(International Astronomical Union, Colloquium on Stellar Hydrodynamics, 58th, Los Alamos, N. Mex., Aug. 12-15, 1980.) Space Scie
Astronomy and Astrophysics
Astronomy
1
Cepheid Variables, Spectral Line Width, Spectral Resolution, Stellar Atmospheres, Stellar Spectra, Gas Ionization, H Alpha Line, Helium, Stellar Models, Stellar Oscillations
Scientific paper
An experimental Fairchild CCD-211 was placed in the 2.1-m coude spectrograph at the Kitt Peak National Observatory and used to record an 87 A spectral band centered on Hα. On the night of July 11, 1979 UT, this system was used to observe continuously the extreme Beta Cephei variable BW Vulpeculae throughout one of its 4-h 49-m cycles with an average exposure of 13 minutes per observation. A total of 18 observations was secured. The results show dramatic profile variations of Hα, including features not previously reported, and extreme variations of the C II 6578 and 6582 A lines, including variations of equivalent width. The fast time-resolution capability and the photometric linearity of the CCD have permitted the detection of subtle effects that have been missed by photographic observations and has led directly to important new interpretations of the complex atmospheric pulsations in this star, including effects of altered opacity on the formation of spectral lines and the suggestion of a helium-ionization heat engine as a mechanism for driving atmospheric pulsations.
Furenlid Ingemar
Young Alex
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