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CO LINE EMISSION FROM CIRCUMSTELLAR ENVELOPES: TOWARDS HIGHER-J TRANSITIONS

机译:圆包络的CO线排放:朝着更高的J跃迁方向发展

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We present the results of a multi-transition CO observational program conducted on a sample of AGB and post-AGB stars envelopes. Using new observations of the CO line at 691 GHz at the CSO, we have collected maps and single pointing observations of these envelope in 5 rotational transitions ranging from J=1-0 to J=6-5. Using a simplified version of the model of Bujarrabal et al. (1989), we have conducted a systematic modelling analysis using the whole set of CO data collected on a sample of 12 sources. Our modelling approach simultaneously fits all five transitions, taking into account the spatial information provided by the maps. We show that most AGBs data can be fitted using a single mass loss rate, at least within the calibration uncertainties associated to the data collected at high frequencies. For some cases though, a change in the mass loss rate history needs to be invoked to reconcile data at low and high-J respectively
机译:我们介绍了对AGB和AGB后的星际信封样本进行的多次过渡CO观测程序的结果。使用在CSO处691 GHz处CO线的新观测值,我们收集了这些包络线的地图和单点观测值,这些观测值包括从J = 1-0到J = 6-5的5个旋转过渡。使用Bujarrabal等人模型的简化版本。 (1989),我们使用从12个来源的样本中收集的整套CO数据进行了系统的建模分析。考虑到地图提供的空间信息,我们的建模方法可同时适合所有五个过渡。我们显示,大多数AGBs数据可以使用单个质量损失率拟合,至少在与高频收集的数据相关的校准不确定性范围内。不过,在某些情况下,需要调用质量损失率历史记录的变化以协调低J和高J的数据

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