Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of the rapid magnetic field variability in gamma Equ   We investigated magnetic variability of the roAp star gamma Equ (HD 201601)
with high time resolution. Measurements of the stellar longitudinal magnetic
field B_e were performed with the hydrogen line polarimeter and the 6-m optical
telescope of Special Astrophysical Observatory on 20/21 August 1989. We
obtained a single 3-hour series of 1720 rapid B_e measurements for this star
with the average time resolution of 6.6 sec. The averaged value of <B_e> on
this night equals -750 \pm 22 G. Both the power spectrum and the amplitude
spectrum of the B_e time series essentially are flat. However, they show the
presence of a marginally significant magnetic period at P_B = 3.596 min. which
is real with the probability 67 %. The amplitude of the magnetic field
variations with this period equals 347 \pm 31 G. We did not detect variations
of B_e field in gamma Equ with the well-known photometric period, P_phot=12.44
min.

31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math