Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..278w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 1, 1987, p. 278-283.
Astronomy and Astrophysics
Astronomy
18
Aries Constellation, Binary Stars, Microwave Spectra, Radio Sources (Astronomy), Stellar Spectra, Variable Stars, Circular Polarization, Polarized Electromagnetic Radiation, Stellar Magnetic Fields, Stellar Models, Synchrotron Radiation
Scientific paper
The VLA was used to observe the RS CVn stars, UX Arietis, HR 1099, HR 5110, and II Pegasi with a time resolution of 6.6 s at two pairs of wavelengths near 4835 MHz and 1415 MHz. Variable emission was detected from UX Arietis at 4835 MHz on time scales ranging from 30 s to more than 1 hr. From the variations an upper limit to the source size of L ≤ 9×1011cm is derived. The authors also derive a magnetic field of H ≤ 15 G for the varying source and show that the time scale of the variations cannot be due to synchrotron radiation losses. Instead it is suggested that the variations may be due to absorption by a thermal plasma located between the stars of the binary system.
Lang Kenneth R.
Willson Robert F.
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