The effects of zonal atmospheric currents on the spectra of rotating early-type stars

Details The effects of zonal atmospheric currents on the spectra of rotating early-type stars The effects of zonal atmospheric currents on the spectra of rotating early-type stars

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..720c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 2, p. 720-730.

Astronomy and Astrophysics

Astrophysics

9

Atmospheric Turbulence, Early Stars, Stellar Atmospheres, Stellar Rotation, Astronomical Models, Stellar Spectra, Wind Effects

Scientific paper

We suggest the existence of zonal currents in the atmospheres of rapidly rotating stars analogous to those found in planetary atmospheres. The zonal flow is assumed to be characterized by 'thin' atmospheric, nearly geostrophic flow which does not change the gravity darkening and stellar shape determined by the underlying uniformly rotating model. The contribution that such flows make to the continuum spectra of such stars is investigated. The additional rotationally induced Doppler displacement resulting from such zonal wind belts can distort the rotationally broadened stellar lines leading to significant departures from the line profiles predicted by the classical model of rotating stars. Our estimates of the zonal flow velocity stem from the assumption of a relation between it and the latitudinal wavenumber of the zonal velocity field. It is thus possible to create barotropic atmosphere models which, in turn, enable the modeling of the stellar spectrum including important spectral lines. In addition, the radiative transfer equations for the Stokes parameters I and Q are solved for the locally plane-parallel atmospheres so that the polarization structure of the radiation field is determined. We find that the presence of zonal wind belts leads to significant changes in the photospheric polarization from those characteristic of a uniformly rotating model.

Affiliated with

Also associated with

No associations

Rating

The effects of zonal atmospheric currents on the spectra of rotating early-type stars 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 effects of zonal atmospheric currents on the spectra of rotating early-type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The effects of zonal atmospheric currents on the spectra of rotating early-type stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1491040