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ISOCAM OBSERVATIONS OF GALACTIC GLOBULAR CLUSTERS: MASS LOSS ALONG THE RED GIANT BRANCH

机译:银河系团簇的ISOCAM观测:红色巨人分支的质量损失

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摘要

Deep images in the 10 μm spectral region have been obtained for five massive Galactic globular clusters, NGC 104 (=47 Tuc), NGC 362, NGC 5139 (=ω Cen), NGC 6388, NGC 7078 (=M15), and NGC 6715 (=M54) in the Sagittarius Dwarf Spheroidal using the ISOCAM on board the Infrared Space Observatory in 1997. A significant sample of bright giants have an ISOCAM counterpart, but only fewer than 20% of these have a strong mid-IR excess indicative of dusty circumstellar envelopes. From a combined physical and statistical analysis we derive mass-loss rates and frequency. We find that (1) significant mass loss occurs only at the very end of the Red Giant Branch evolutionary stage and is episodic, (2) the modulation timescales must be greater than a few decades and less than a million years, and (3) mass-loss occurrence does not show a crucial dependence on the cluster metallicity.
机译:对于五个巨大的银河系球状星团,NGC 104(= 47 Tuc),NGC 362,NGC 5139(=ωCen),NGC 6388,NGC 7078(= M15)和NGC 6715,已获得10μm光谱区域的深层图像。 (= M54)于1997年在红外太空天文台上使用ISOCAM在人马座矮球体中进行观测。大量明亮的巨人都有一个ISOCAM对应物,但只有不到20%的中红外强于粉尘绕星包络。通过组合的物理和统计分析,我们可以得出质量损失率和频率。我们发现(1)重大质量损失仅发生在Red Giant Branch演化阶段的最后阶段,并且是偶发的;(2)调制时间尺度必须大于几十年且小于一百万年,以及(3)质量损失的发生并没有显示出对团簇金属性的关键依赖性。

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