Rapid Oscillations in the Spectrum of roAp Stars χ Psc and γ Equ

Details Rapid Oscillations in the Spectrum of roAp Stars χ Psc and γ Equ Rapid Oscillations in the Spectrum of roAp Stars χ Psc and γ Equ

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001oap....14..110a&link_type=abstract

Odessa Astronomical Publications, 14, 110-112

Astronomy and Astrophysics

Astronomy

Spectroscopy Of Stars-Roap Stars-Stellar Magnetism

Scientific paper

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.

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