Microvariability of line profiles in the spectra of OB stars: III. The supergiant r LEO

We observed the bright supergiant r Leo (B1 lab) in January--February 2004 using the 6-m telescope of the Special Astrophysical Observatory (Russia) and the 1.8-m telescope of the Bohyunsan Optical Astronomy Observatory (South Korea). 47 spectra with high time resolution (4--10 min), signal-to-noise ratios 300--1000, and spectral resolutions 45 000--60 000 were obtained. We detected variability in the HeI, SiII, SiIII, and NII line profiles, which may be due to rotational modulation of the profiles and photospheric pulsations of r Leo. The possible influence of the stellar magnetic field on the line-profile variations is discussed.