On some aspects of Balmer-line formation in rotating white dwarfs

Details On some aspects of Balmer-line formation in rotating white dwarfs On some aspects of Balmer-line formation in rotating white dwarfs

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..548k&link_type=abstract

Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 548-554.

Astronomy and Astrophysics

Astrophysics

4

Balmer Series, Line Spectra, Stellar Atmospheres, Stellar Rotation, White Dwarf Stars, Angular Momentum, Gravitational Effects, Orbital Velocity, Rotating Spheres, Stellar Evolution, Stellar Structure

Scientific paper

Balmer-line profiles computed with the most recent addition to the Griem (1974) broadening theory are investigated for model atmospheres of both rapidly and slowly rotating white dwarfs. The model calculations are outlined, the theoretical basis for von Zeipel's theorem and its inapplicability to white dwarfs are discussed, and Balmer-line profiles are presented for two models of rapidly rotating stars. Observational evidence for slowly rotating white dwarfs is summarized, and profiles are computed for four slowly rotating models. It is shown that the observed line profiles are affected only by rotational velocity and latitudinal pressure gradients in the atmospheres, that changes in residual intensities in the Balmer lines are negligible for wavelength differences greater than 7 A regardless of viewing angle even for rapidly rotating stars, and that the changes in line profiles are smaller for slow rotators. Fits of theoretical profiles to available observations yield values of v sin i of less than 70 km/s and less than 60 km/s, respectively, for the slow rotators W1346 and 40 Eri B.

Affiliated with

Also associated with

No associations

Rating

On some aspects of Balmer-line formation in rotating white dwarfs 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 On some aspects of Balmer-line formation in rotating white dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On some aspects of Balmer-line formation in rotating white dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1141317