| |
 |
| 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. |
|
|
|
|
|
