Pulsational mode-typing in line profile variables. V - Multimodes and 'moving shells' in Nu Eridani and other Beta Cephei stars

Details Pulsational mode-typing in line profile variables. V - Multimodes and 'moving shells' in Nu Eridani and other Beta Cephei stars Pulsational mode-typing in line profile variables. V - Multimodes and 'moving shells' in Nu Eridani and other Beta Cephei stars

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..338s&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 338-353.

Astronomy and Astrophysics

Astrophysics

20

Cepheid Variables, Line Spectra, Stellar Oscillations, Stellar Spectra, Radial Velocity, Shock Waves, Signal To Noise Ratios, Stellar Atmospheres

Scientific paper

An analysis of 31 high-resolution Reticon observations of the Si III 4567 A line reveals that most of its variations in shape are a result of nonlinear hydrodynamic processes that remain in phase with the dominant fourth (radial velocity-producing) mode. Line profile analysis shows that this fourth mode is compatible only with radial pulsation and incompatible with any nonradial pulsation mode, including any with m = 0. When the hydrodynamical effects are nearly absent from the profiles at certain times during the cycle, only one of the three nonradial modes (-m = l) is found to be of importance in describing the residual profile variations; this is in agreement with the star's presumed equator-on aspect and with energy equipartition for the triplet-modes. Several conditions imposed by the spectroscopic and photometric amplitudes of the triplet modes require the identification l = 2, and m = -2, -1, and 0.

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