Seismology of stellar envelopes: probing the outer layers of a star through the scattering of acoustic waves

Details Seismology of stellar envelopes: probing the outer layers of a star through the scattering of acoustic waves Seismology of stellar envelopes: probing the outer layers of a star through the scattering of acoustic waves

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.322..473l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 3, pp. 473-485.

Astronomy and Astrophysics

Astronomy

13

Sun: Interior, Sun: Oscillations, Stars: Interiors, Stars: Oscillations

Scientific paper

The outer layers of Sun-like stars are regions of rapid spatial variation which modulate the p-mode frequencies by partially reflecting the constituent acoustic waves. With the accuracy that has been achieved by current solar observations, and that is expected from imminent stellar observations, this modulation can be observed from the spectra of the low-degree modes. We present a new and simple theoretical calculation to determine the leading terms in an asymptotic expansion of the outer phase of these modes, which is determined by the structure of the surface layers of the star. Our procedure is to compare the stellar envelope with a plane-parallel polytropic envelope, which we regard as a smooth reference background state. Then we can isolate a seismic signature of the acoustic phase and relate it to the stratification of the outer layers of the convection zone. One can thereby constrain theories of convection that are used to construct the convection zones of the Sun and Sun-like stars. The accuracy of the diagnostic is tested in the solar case by comparing the predicted outer phase with an exact numerical calculation.

Affiliated with

Also associated with

No associations

Rating

Seismology of stellar envelopes: probing the outer layers of a star through the scattering of acoustic waves 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 Seismology of stellar envelopes: probing the outer layers of a star through the scattering of acoustic waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seismology of stellar envelopes: probing the outer layers of a star through the scattering of acoustic waves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1254510