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

Автор(и)

  • S. G. Aliev Shemakha astrophysical observatory NAS of Azerbaijan, Азербайджан
  • N. Z. Ismailov Shemakha astrophysical observatory NAS of Azerbaijan, Азербайджан

DOI:

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

Ключові слова:

spectroscopy of stars, roAp stars, stellar magnetism.

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.

Посилання

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Kanaan A., Hatzes A.P.: 1998, Astrophys. J., 503, 848.

Malanushenko V., Savanov I.S., Ryabchikova T.: 1998, IBVS, N 4650.

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Опубліковано

2017-04-20

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