Radio observations of peculiar emission-line Algol binary stars

Details Radio observations of peculiar emission-line Algol binary stars Radio observations of peculiar emission-line Algol binary stars

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..337e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 337-341.

Astronomy and Astrophysics

Astronomy

3

Binary Stars, Line Spectra, Peculiar Stars, Radio Observation, Spectral Emission, Bremsstrahlung, Brightness Temperature, Stellar Evolution, Stellar Luminosity

Scientific paper

Twelve peculiar emission-line Algol (PELA) binaries were observed at cm wavelengths. Six of these objects, WW And (tentative), KX And, AM Aur, V644 Mon, DN Ori, and AY Per were detected at the 100 to 400 micro-Jy level, corresponding to luminosity densities of order 10 exp 17 erg/s/Hz. These luminosity densities, combined with nearly flat cm spectra and high brightness temperatures, are consistent with the nonthermal gyrosynchrotron radiation model proposed as the result of observations from the previous PELA survey. Also, the star V367 Cyg was reobserved at thirteen different orbital phases; no variability was found within the errors. V367 Cyg's lack of variability and well-determined average spectral index, however, imply the possibility of a different emission mechanism, thermal bremsstrahlung, although the nonthermal model cannot be entirely ruled out. The characteristic brightness temperature of thermal bremsstrahlung is only about 10,000 K, which means that the radius of the emission region would have to be much larger than previously assumed, about 10 AU. Suggestions for further observations of all previously observed PELAS are presented in order to determine the correct emission mechanism.

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