DOI: https://doi.org/10.18524/1810-4215.2001.14.99141

RAPID OSCILLATIONS IN THE SPECTRUM OF roAp STARS χ PSC AND γ EQU

S. G. Aliev, N. Z. Ismailov

Анотація


Results of high time and spectral resolution spectral observations with CCD in 1998-1999 for Ap stars χ Psc and γ Equ were presented. Spectroscopic parameters (Vr, Wλ) of spectral lines SiII, CrI, CrII, FeI, FeII, Hα, Hβ shows that despite of different value of rotation velocity of χ Psc (180 km/s) and γ Equ (∼74 years), both stars shows short-time oscillations of spectral parameters, and concern to a subgroup of roAp stars. It is showed that spectroscopic parameters and magnetic field strength variations may be described with short-time pulsation periods ∼17 min and ∼12 min for χ Psc and γ Equ correspondingly.

Ключові слова


spectroscopy of stars; roAp stars; stellar magnetism.

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Посилання


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