Spectral and Photoelectric Studies of the Herbig Ae/Be Star HD 259431 |
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| Authors: | J N Chkhikvadze |
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| Institution: | (1) Abastumani Astrophysical Observatory, Georgia |
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| Abstract: | Spectral and photoelectric (ubvy, H , H ) observations of the Herbig Ae/Be star HD 259431 are reported. It is found that as its brightness fades, this star becomes bluer in the Paschen continuum and the intensity and equivalent width of the hydrogen emission lines increase. The spectral observations reveal significant variations in the intensity of the Mg II 4481 Å photospheric absorption line. A rise and fall in the luminosity by 0m.04 within a period of 5-7 minutes was recorded. Radical variations in the H lineshape ("double"  "P Cyg") and flare activity are not only observed in this star, but also in a number of HAEBE stars. It is suggested that flare activity may initiate a change in the velocity gradient at the base of the wind and, thereby, induce "double P Cyg" or "P Cyg single" transitions. The nonradial pulsations of this star are also discussed. |
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| Keywords: | stars photometry spectrophotometry - stars individual HD 259431 stars |
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