Submillimetre Variability of Eta Carinae: cool dust within the outer ejecta - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: Previous submillimetre submm observations detected 0.7 solar masses of cooldust emission around the Luminous Blue Variable LBV star Eta Carinae. Theseobservations were hindered by the low declination of Eta Carinae andcontamination from free-free emission orginating from the stellar wind. Here,we present deep submm observations with LABOCA at 870um, taken shortly after amaximum in the 5.5-yr radio cycle. We find a significant difference in thesubmm flux measured here compared with the previous measurement: the firstindication of variability at submm wavelengths. A comparison of the submmstructures with ionised emission features suggests the 870um is dominated byemission from the ionised wind and not thermal emission from dust. We estimate0.4 +- 0.1 solar masses of dust surrounding Eta Carinae. The spatialdistribution of the submm emission limits the mass loss to within the lastthousand years, and is associated with mass ejected during the great eruptionsand the pre-outburst LBV wind phase; we estimate that Eta Carinae has ejected >40 solar masses of gas within this timescale.



Author: H. L. Gomez, C. Vlahakis, C.M. Stretch, L. Dunne, S.A. Eales, A. Beelen, E.L. Gomez, M.G. Edmunds

Source: https://arxiv.org/



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