Bibcode
Bonet, J. A.; Marquez, I.; Vazquez, M.; Woehl, H.
Bibliographical reference
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 492-500. DGICYT-supported research.
Advertised on:
4
1991
Citations
18
Refereed citations
15
Description
A computing code has been developed to simulate the center-to-limb
variation (CLV) of the bisector's shape, and absolute wavelength shift
of the core in strong photospheric lines. Observational results
concerning these aspects are also reported for the K I 7699 line. In the
numerical simulation, granulation is represented, as a first
approximation, by means of the granular model by Nelson (1978). It
appears that granulation alone does not reproduce the observations and
thus some modification has to be implemented in the dynamical model
employed. A good match to the observed CLV of the wavelength shift of
the line core is achieved by adding two 8-min period gravity waves with
horizontal wavelength of the granular scale, the only difference between
them being the sign of their horizontal wavenumber. Changes in the phase
difference between the oscillating parameters have a decisive influence
on the result.