CAOSP abstracts, Volume: 27, No.: 3, year: 1998
- Author(s): DRAKE, S.A.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 3, p. 382-389.
- Date: 04/1998
- Title: High-energy phenomena in magnetic CP stars as revealed by their X-ray and radio emission
- Keyword(s): STARS: CHEMICALLY PECULIAR, RADIO CONTINUUM: STARS, X-RAYS: STARS
- Pages: 382 -- 389
Abstract:
Before 1985, attempts to detect radio or X-ray emission from Magnetic CP
(MCP) stars were either fruitless or ambiguous. However, more successful
results have been obtained in the last dozen years: (i) Radio emission has
now been detected from appr. 35 MCP stars of the Helium-peculiar and
Silicon-strong subclasses, with a functional dependence of radio luminosity
L(R) proportional to T_(eff)^(7) H_(s)^(1.2) P_(rot)^(-0.6), where T(eff) is
the effective temperature, H_(s) is the surface magnetic field strength, and
P_(rot) is the rotational period; rotational modulation of the radio emission
has also been observed for several MCP stars. All of this evidence suggests
that it is the MCP stars themselves, not close companions, that are responsible for
the radio emission; (ii) The X-ray emission properties of MCP stars are however
still poorly characterized: although a moderate number (appr. 18) have by
now been associated with X-ray sources, the lack of a clear correlation of
this X-ray emission with other stellar parameters has made it difficult to
rule out the close companion hypothesis.
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