2800 Mg II emission in the most active radio stars
Spectral recordings in the region near 2800 Å are examined from the IUE archives for the twenty most active radio stars, which are also close binary systems. In all of these spectra, the doublet k and h Mg II is seen in strong emission. We find that the observed fluxes of the magnesium doublet emission are directly proportional to the mean fluxes of the observed radio emission at the frequency of 8.4 GHz. The same correlation is found between the absolute luminosities of the radio emission and magnesium doublet emissions. It is argued that the source of both emissions, radio and magnesium doublet, is related to a high temperature stratified cloud located between the components of the binary system. The fluxes of the magnesium doublet emission of these sources are much larger, by one or two orders of magnitude, compared with the usual chromospheric magnesium emission seen in single stars.
KeywordsMagnesium Binary System Radio Emission Strong Emission Close Binary System
Unable to display preview. Download preview PDF.
- Bethe, H. and Gurzadyan, G.A.: 1991,Astrophys. Space Sci. 183, 1.Google Scholar
- Buscombe, W.: 1977,MK Spectral Classification. 7th General Catalogue, Northwestern University.Google Scholar
- Dupree, A.R., Kenyon, S.J.: 1989, Preprint Series No.2892. Harvard-Smithsonian Center for Astrophysics.Google Scholar
- Gurzadyan, G.A.: 1984,Stellar Chromospheres, or Doublet of 2800 Mg II in Astrophysics, Nauka, Moscow (in Russian).Google Scholar
- Slee, O.B.et al.: 1987a,Monthly Not. Roy. Astr. Soc. 229, 659.Google Scholar
- Slee, O.B.et al., 1987b,Monthly Not. Roy. Astr. Soc. 227, 467.Google Scholar
- Stewart, R.T.: 1987, in: J.L. Linsky and R.E. Stencel (eds.),Cool Stars, Stellar Systems, and the Sun, Springer Verlag, Heidelberg.Google Scholar
- Strassmeier, K.G.et al.: 1988,Astron. Astroph. Suppl. 72, 291.Google Scholar