Variations in the B Supergiants winds

HAUCKE, M.; CIDALE, L.; VENERO, R.; KRAUS, M.; CURE, M.

Ginebra

Congreso; European Week of Astronomy and Space Science; 2014

IAU

We present here a preliminary study of the wind variability of two B3 supergiant stars (HD 53 138 and HD 75 149) via a line fitting procedure. We model high resolution line spectra of H↵, H", H#, He I 4387, He I 4471, He I 6678 and He II 4686 with the FASTWIND NLTE atmosphere code. The observations were carried out at the Complejo Astron´omico El Leoncito (CASLEO), San Juan, Argentina, during several observing runs, in 2006, 2013 and 2014. The stars show spectral variations, mainly in its H↵ line profile, not only over a long-period but also on time-scales of hours. The observed variation could be linked to photospheric pulsation modes.