Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..508g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 508-514
Astronomy and Astrophysics
Astrophysics
6
Emission Spectra, H Alpha Line, Radial Velocity, Shock Wave Propagation, Stellar Activity, Stellar Oscillations, Variable Stars, Astronomical Spectroscopy, Photosphere, Stellar Atmospheres
Scientific paper
For the first time, high spectral resolution observations of the hydrogen alpha profile of BL Her, obtained with a modern detector, during the whole pulsating period are presented. It clearly appears that the profile evolution is very similar to that observed in RR Lyrae stars which are localized just below the BL Herculis stars in the Population II instability strip. No secondary emission is detected. The pulsation has the form of a running wave. The shock wave associated with the emission is accelerated during its propagation between the photosphere and the region where the hydrogen line is formed. The effect of the 2:1 resonance between the fundamental mode and the second overtone is well observed on the photospheric radius and acceleration curves.
Burki Gilbert
Chatel A.
Duquennoy Antoine
Gillet Denis
Lebre Agnès
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