Radio detection of nebulae around four LBV stars in the LMC
Abstract
The nebulae associated to four Luminous Blue Variables (LBVs) in the Large Magellanic Cloud (LMC) have been observed at 5.5 and 9 GHz using the Australia Telescope Compact Array, and radio emission has been detected for first time in these sources, R127, R143, S61 and S119. The radio maps of the nebulae have an angular resolution of 1.5" and a sensitivity of 1.5-3.0×10-2 mJy beam-1, and show a very similar morphology to that observed in Hα. This similarity permit us to assume that the Hα emission is not affected by strong intrinsic extinction due to dust within the nebulae. We estimate the masses of the ionized gas in the LBVs nebulae and their values are consistent with those measured in Galactic LBVs.
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