Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models

Details Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models

2004-09-14

arxiv.org/abs/astro-ph/0409325v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, proceedings of the SOHO14/GONG 2004 Workshop "Helio- and Asteroseismology: Towards a Golden Future" from J

Scientific paper

Hydrodynamical, 3D simulations of the outer layers of the Sun and Alpha Cen A are used to obtain constraints on the properties of turbulent convection in such stars. These constraints enable us to compute - on the base of a theoretical model of stochastic excitation - the rate P at which p modes are excited by turbulent convection in those two stars. Results are then compared with solar seismic observations and recent observations of Alpha Cen A. For the Sun, a good agreement between observations and computed P is obtained. For Alpha Cen A a large discrepancy is obtained which origin cannot be yet identified: it can either be caused by the present data quality which is not sufficient for our purpose or by the way the intrinsic amplitudes and the life-times of the modes are determined or finally attributed to our present modelling. Nevertheless, data with higher quality or/and more adapted data reductions will likely provide constraints on the p-mode excitation mechanism in Alpha Cen A.

Affiliated with

Also associated with

No associations

Rating

Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-414751