Variability of the spectrum and brightness of RY Tau |
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| Authors: | N Z Ismailov P N Shustarev A N Adigezalzade G R Bahaddinova |
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| Institution: | 1.Baku State University,Baku,Azerbaijan;2.Shemakha Astrophysical Observatory (ShAO),National Academy of Sciences of Azerbaijan,Shemakha,Azerbaijan |
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| Abstract: | The results of spectroscopic observations of the star RY Tau in the ultraviolet based on IUE data and in the visual spectral range obtained at ShAO are presented. Despite significant brightness variability in 1983–1984, the Mg II λ2800 Å emission doublet showed no synchronous variation with the UBV photometric data. Periodic variability of the Mg II λ2800 Å emission intensity with a period of 23 days has been detected for the first time. The periodicity is also observed for a group of such lines as CIV λ1450 Å, He II λ1640 Å, and S II λ1756 Å. The equivalent widths and shifts of the individual components of the Hα, H + H ε , and CaII K lines also vary with the period found. The observed variability of the emission spectrum can be explained by the existence of a companion in the system in an orbit with a semimajor axis of about 0.13 AU. |
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