Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fifth main sequence magnetic B-type star showing coherent radio
  emission: is this really a rare phenomenon?   We report the discovery of intense, highly directional radio emission from
the Bp star HD 35298, which we interpret as the consequence of Electron
Cyclotron Maser Emission (ECME). The star was observed with the Giant Metrewave
Radio Telescope near the rotational phases of both magnetic nulls in band 4
(550-750 MHz) and one of the nulls in band 5 (1060-1460 MHz). In band 4, we
observed flux density enhancement in both circular polarizations near both
magnetic nulls. The sequences of arrival of the left and right circularly
polarized pulses are opposite near the two nulls. In band 5, we did not have
circular polarization information and hence measured only the total intensity
lightcurve, which also shows enhancement around the magnetic null. The observed
sequence of the circular polarization signs in band 4, compared with the
longitudinal magnetic field curve, is able to locate the hemisphere from which
ECME arises. This observational evidence supports the scenario of ECME in the
ordinary mode, arising in a magnetosphere shaped like an oblique dipole. HD
35298 is the most slowly rotating and most distant main sequence magnetic star
from which ECME has been observed.

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The categories of this paper are: q-alg
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom