Two-dimensional Hydrodynamic Simulations of Zero-Age Main-Sequence Convective Cores

Details Two-dimensional Hydrodynamic Simulations of Zero-Age Main-Sequence Convective Cores Two-dimensional Hydrodynamic Simulations of Zero-Age Main-Sequence Convective Cores

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...543..395d&link_type=abstract

The Astrophysical Journal, Volume 543, Issue 1, pp. 395-405.

Astronomy and Astrophysics

Astronomy

14

Convection, Hydrodynamics, Stars: Interiors

Scientific paper

Two-dimensional, fully implicit hydrodynamic simulations of the structure and motion of convective cores are made on complete zero-age main-sequence stellar models between 1.2 and 20 Msolar. The calculations present a picture of hydrogen-burning convective cores where the convective speeds are tens of kilometers per second and the superadiabatic excess may be quite large at various locations in the core at any time. However, when averaged over angle, radius, and time the superadiabatic excess is only about 10-3, although the steps to obtain this number involve some uncertainties. Convective core overshooting occurs in all models. In units of the pressure scale height at the convective core boundary, the overshooting calculated is about 0.45Hp for models above 3 Msolar, and it decreases to about 0.3Hp for lower mass models. Part of this decrease arises from the increase in the pressure scale height at the convective core boundary as the convective core boundary approaches the center of the model while the model mass becomes small. However, using the actual e-folding distance for the pressure as the unit of measure, the overshooting still shows a small decrease for lower masses.

Affiliated with

Also associated with

No associations

Rating

Two-dimensional Hydrodynamic Simulations of Zero-Age Main-Sequence Convective Cores 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 Two-dimensional Hydrodynamic Simulations of Zero-Age Main-Sequence Convective Cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-dimensional Hydrodynamic Simulations of Zero-Age Main-Sequence Convective Cores will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1148293