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Paper: Long-Term Variability of Emission Lines in the Spectrum of the Be Star HD 152478
Volume: 464, Circumstellar Dynamics at High Resolution
Page: 227
Authors: Pogodin, M. A.; Drake, N. A.; Jilinski, E. G.; Daflon, S.; Herencia, M. I. Z.; de la Reza, R.; Ortega, V. G.
Abstract: We present the results of our spectroscopic investigation of the southern Be star HD 152478. Five high-resolution (R=48 000) spectra of this star were obtained with the FEROS echelle spectrograph at the 2.2 m ESO telescope (La Silla, Chile). Synthetic spectra calculated with SYNPLOT and non-LTE model atmospheres were used to estimate rotational velocity, effective temperature, surface gravity, and He abundance. The spectra of HD 152478 show a remarkable variability in the line profiles of a number of elements as HI, He I, Fe II and others. The analysis of the variability shows that the widely accepted hypothesis of “one-armed perturbation” drifting in the equatorial gaseous disk is not confirmed by the observations. We suggest an alternative interpretation of the observed variability consisting in the assumption of a variable magnetized stellar wind of flattened geometry flowing close to the equatorial disk.
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