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arXiv 1002.1348astro-ph.SR
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尘埃在47 Tuc的红巨星分支上形成吗?

Is Dust Forming on the Red Giant Branch in 47 Tuc?

M. L. Boyer, J. Th. van Loon, I. McDonald, K. D. Gordon, B. Babler, M. Block, S. Bracker, C. Engelbracht, J. Hora, R. Indebetouw, M. Meade, M. Meixner, K. Misse… 展开作者

M. L. Boyer, J. Th. van Loon, I. McDonald, K. D. Gordon, B. Babler, M. Block, S. Bracker, C. Engelbracht, J. Hora, R. Indebetouw, M. Meade, M. Meixner, K. Misselt, M. Sewilo, B. Shiao, B. Whitney

摘要:

使用斯皮策IRAC观测SAGE-SMC遗产计划和存档的斯皮策IRAC数据,我们调查尘埃生产47 Tuc,附近的大规模银河系球状星团。先前的一项研究发现了红外线过量,表明星周尘埃,在47 Tuc的大量恒星中,跨越了整个红巨星分支(RGB)。我们表明,这些结果遭受恒星混合和成像文物所造成的影响,它很可能是没有恒星低于约1等的RGB的尖端正在产生尘埃。唯一看起来有尘埃的恒星是变星,它们也是星团中最冷、最亮的恒星。

英文摘要:

Using Spitzer IRAC observations from the SAGE-SMC Legacy program and archived Spitzer IRAC data, we investigate dust production in 47 Tuc, a nearby massive Galactic globular cluster. A previous study detected infrared excess, indicative of circumstellar dust, in a large population of stars in 47 Tuc, spanning the entire Red Giant Branch (RGB). We show that those results suffered from effects caused by stellar blending and imaging artifacts and that it is likely that no stars below about 1 mag from the tip of the RGB are producing dust. The only stars that appear to harbor dust are variable stars, which are also the coolest and most luminous stars in the cluster.

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。

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