Microvariability of line profiles in the spectra of OB stars: III. The supergiant ρ LEO
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- Kholtygin, A.F., Fabrika, S.N., Burlakova, T.E. et al. Astron. Rep. (2007) 51: 920. doi:10.1134/S1063772907110054
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We observed the bright supergiant ρ 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 ρ Leo. The possible influence of the stellar magnetic field on the line-profile variations is discussed.