Radio observations of IRAS-selected Southern hemisphere classical Be stars |
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Authors: | Clark Steele & Fender |
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Institution: | Astronomy Centre, University of Sussex, Falmer, Brighton, BN1 9QH,;Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ,;Astrophysics Research Institute, Liverpool John Moores University, Liverpool, L3 3AF,;Astronomical Institute 'Anton Pannekoek', University of Amsterdam and Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands |
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Abstract: | We present the first radio observations of a sample of 13 optically and IR-bright Southern hemisphere classical Be stars made from the Australian Telescope Compact Array at 3.5 and 6.3 cm simultaneously. One star, δ Cen, was detected at 3.5 cm, and a second, μ Cen, was also thought to have been detected; further observations of this source are required to confirm this detection. No sources were detected at 6.3 cm, although δ Cen was previously detected at this wavelength by other observers at a higher flux than our detection limit. The radio observations show that the spectral energy distribution undergoes a turnover between the far-IR and radio wavelengths, as was seen in previous studies. Likewise we find no simple correlation between far-IR and radio flux. Lower limits to the outer disc radius were found to be of the order of a few hundred solar radii i.e. of the order of those found previously by Taylor et al. |
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Keywords: | circumstellar matter stars: emission-line Be radio lines: stars |
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