Open AccessThe null result of a search for pulsational variations of the surface magnetic field in the roAp star γ Equulei
Author(s) -
Kochukhov O.,
Ryabchikova T.,
Landstreet J. D.,
Weiss W. W.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07946.x
Subject(s) - physics , magnetic field
We describe an analysis of the time‐resolved measurements of the surface magnetic field in the roAp star γ Equ. We have obtained a high‐resolution and high signal‐to‐noise (S/N) spectroscopic time series, and the magnetic field was determined using Zeeman‐resolved profiles of the Fe ii 6149.25 Å and Fe i 6173.34 Å lines. Contrary to recent reports, we do not find any evidence of magnetic variability with pulsation phase, and derive an upper limit of 5–10 G for pulsational modulation of the surface magnetic field in γ Equ.