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A. F. Kholtygin A. A. Batrakov S. N. Fabrika A. F. Valeev I. M. Tumanova O. A. Tsiopa 《Astrophysical Bulletin》2018,73(4):471-477
This study continues our investigation of the super-fast variability of line profiles in the spectra of early-type stars. We have investigated the line-profile variability in spectra of OBA-stars with the SCORPIO multi-mode focal reducer mounted at the 6-m SAO RAS telescope. Regular short-period variations of the H and He lines in the spectra of the B1I star ρ Leo were detected with periods ranging from 2 to 90 minutes, as well as irregular line-profile variations on time intervals less than 1 minute. A possible origin of rapid spectral variations is discussed. 相似文献
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Ionospheric perturbation indices based on the low- and high-orbiting satellite radio tomography data
Nesterov I. A. Andreeva E. S. Padokhin A. M. Tumanova Yu. S. Nazarenko M. O. 《GPS Solutions》2017,21(4):1679-1694
GPS Solutions - Methods are suggested for constructing ionospheric perturbation indices (IPIs) based on empirical radio tomographic (RT) electron density distributions taking into account... 相似文献
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