The Luminous Blue Variable RMC 127 as Seen with ALMA and ATCA

摘要: We present ALMA and ATCA observations of the luminous blue variable RMC 127. The radio maps show for first time core nebula evidence that is strongly asymmetric with a Z-pattern shape. Hints this morphology are also visible in archival Hubble Space Telescope Hα image, which overall resembles emission. emission mechanism outer optically thin free–free radio. At high frequencies, component point-source appears at position star, up to frequencies. rising flux density distribution (S_ν ~ ν^(0.78±0.05)) object suggests thermal from ionized stellar wind indicates departure spherical symmetry n_e(r) ∝ r^(-2). examine different scenarios explain excess can arise bipolar outflow, supporting suggestion by other authors 127 aspherical. fit data two collimated models, we find mass-loss rate be factor or more smaller than case. photometry obtained IR space telescopes deduce mid- far-IR must extended, cool (~80 K) dust within nebula. Finally, discuss possible nebular morphology: canonical single-star expanding shell geometry precessing jet model assuming presence companion star.