Eta Carinae的亚毫米变率：外部喷出物中的冷尘埃
Submillimetre Variability of Eta Carinae: cool dust within the outer ejecta
摘要：
以前的亚毫米（submm）观测检测到0.7太阳质量的冷尘埃排放围绕发光蓝变（LBV）恒星Eta Carinae。这些观测受到船底座η星的低衰减和来自恒星风的自由辐射的污染的阻碍。在这里，我们提出了深亚毫米观测与LABOCA在870微米，在5.5年的无线电周期的最大值后不久。我们发现一个显着的差异，在这里测量的submm通量与以前的测量相比：在submm波长的变化的第一个迹象。亚毫米结构与电离发射特征的比较表明，870微米主要是由电离风的发射，而不是尘埃的热发射。我们估计Eta Carinae周围的尘埃质量为0.4 +/- 0.1太阳质量。亚毫米辐射的空间分布限制了质量损失在过去的一千年内，并且与大爆发和爆发前LBV风阶段的质量喷射有关;我们估计Eta Carinae在这个时间尺度内喷射了> 40个太阳质量的气体。
英文摘要：
Previous submillimetre (submm) observations detected 0.7 solar masses of cool dust emission around the Luminous Blue Variable (LBV) star Eta Carinae. These observations were hindered by the low declination of Eta Carinae and contamination from free-free emission orginating from the stellar wind. Here, we present deep submm observations with LABOCA at 870um, taken shortly after a maximum in the 5.5-yr radio cycle. We find a significant difference in the submm flux measured here compared with the previous measurement: the first indication of variability at submm wavelengths. A comparison of the submm structures with ionised emission features suggests the 870um is dominated by emission from the ionised wind and not thermal emission from dust. We estimate 0.4 +/- 0.1 solar masses of dust surrounding Eta Carinae. The spatial distribution of the submm emission limits the mass loss to within the last thousand years, and is associated with mass ejected during the great eruptions and the pre-outburst LBV wind phase; we estimate that Eta Carinae has ejected > 40 solar masses of gas within this timescale.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
