The peculiar structure of very cool non-DA white dwarf atmospheres

Details The peculiar structure of very cool non-DA white dwarf atmospheres The peculiar structure of very cool non-DA white dwarf atmospheres

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..227k&link_type=abstract

Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 227-233.

Astronomy and Astrophysics

Astrophysics

7

Abundance, Heat Flux, Stellar Atmospheres, Stellar Models, Stellar Temperature, White Dwarf Stars, Carbon, Conductive Heat Transfer, Convective Heat Transfer, Equations Of State, Opacity, Radiative Heat Transfer, Rayleigh Scattering, Temperature Gradients

Scientific paper

Because cool, pure He gas without pressure ionization has only Rayleigh scattering opacity, and even this opacity is unusually low under the very late cooling sequence conditions considered in the case of non-DA white dwarfs, these stars have thick outermost layers which barely contribute to stellar atmospheric processes. In the partially pressure-ionized atmosphere, moderately strong electron degeneracy is found. For model atmosphere effective temperatures lower than 3000 K, radiative, conductive and convective flux are all important in the photosphere of the star. The combined action of conduction and very effective convection leads to an atmospheric temperature gradient flatter than that of a radiative atmosphere. In addition, the density variation through the photosphere is typically smaller by more than an order of magnitude than in the solar case, as a consequence of the rapid increase of pressure ionization and, therefore, of opacity, with density.

Affiliated with

Also associated with

No associations

Rating

The peculiar structure of very cool non-DA white dwarf atmospheres 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 The peculiar structure of very cool non-DA white dwarf atmospheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The peculiar structure of very cool non-DA white dwarf atmospheres will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1100385