Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982japa....3..297p&link_type=abstract
Journal of Astrophysics and Astronomy, vol. 3, Sept. 1982, p. 297-302.
Astronomy and Astrophysics
Astrophysics
1
B Stars, Balmer Series, Gas Flow, Radial Velocity, Stellar Envelopes, Velocity Distribution, Absorption Spectra, Conservation Laws, Hydrogen, Kinetic Energy, Radiation Pressure, Shell Stars, Stellar Mass, Stellar Models, Stellar Temperature
Scientific paper
The Balmer progression in velocities seen in Pleione and other shell stars is investigated without undertaking the complicated calculations of non-LTE radiative transfer and hydrodynamics of the shells. The equations of the conservation of mass and momentum are simultaneously solved using assumptions which simplify the calculations of the solution. The radiation pressure due to the lines and continuum are examined. It is found qualitatively that the high excitation Balmer lines of hydrogen are formed in a region where the velocity gradients are high and therefore these lines show high radial velocities.
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