Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..337a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, v.278, p.337
Astronomy and Astrophysics
Astronomy
12
Line: Profiles - Stars: Fundamental Parameters - Cepheids
Scientific paper
The contribution function of different atmospheric layers to a spectral line flux depression is derived. Flux contribution contour diagrams based on this function are introduced and are used to model the effects that pulsational velocity fields have on spectral line formation in a Cepheid atmosphere. In the presence of a constant velocity, the less Doppler-shifted wing of a spectral line is no longer formed at deep atmospheric layers close to the continuum. The presence of a velocity gradient can have a larger effect on the region of line formation. Multiple centres of absorption, separated in wavelength and in physical depth, can occur which will not usually be resolved by observation. The use of spectral lines of different strength and excitation potential to probe depth-dependent phenomena in pulsating stars will give incorrect results if based on static model line formation techniques.
Albrow Michael D.
Cottrell Peter L.
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