The study of the nonstationarity of the HD 21 291 atmosphere

Details The study of the nonstationarity of the HD 21 291 atmosphere The study of the nonstationarity of the HD 21 291 atmosphere

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989kfnt....5...75r&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 5, Jan.-Feb. 1989, p. 75-79. In Russian.

Computer Science

Atmospheric Composition, Stellar Atmospheres, Stellar Spectrophotometry, Supergiant Stars, H Alpha Line, Radial Velocity, Spectrograms, Stellar Spectra

Scientific paper

Spectrograms of HD 21 291 (B9 Ia) with dispersions of 0.4-1.5 nm/mm are used to study the time variations of the radial velocities and differential shifts of hydrogen, helium, and metal ion lines. The dependence of the radial velocities on the line formation depth indicate that the atmospheric motions are of the pulsation type. Maximum shifts are about +7 and -25 km/s for contraction and expansion, respectively.

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