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arXiv 1409.3422astro-ph.SR
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行星状星云的距离

On the distances of planetary nebulae

Haywood Smith

摘要:

我们重新考虑校准行星状星云的统计距离尺度,检查精度和系统误差的各种距离的方法,以及规模本身。一种不同的校准策略,一种基于Harris等人(2007; Benedict等人2009)的精确三角函数的校准策略。大多数统计尺度都有一个整体的尺度误差;此外,所有四个测试显示距离比[尺度/实际]对星云半径的依赖性。然而,Frew的H-alpha标度(2008;在Frew et al. 2014中略有修订)在大R时只有很小的半径依赖性,总体上与这些松弛一致。一些用于校准的方法存在系统误差,并且发现消光法大多不可靠。比较依巴谷的一些大行星与我们的“最佳估计”的距离证实了哈里斯等人发现的高估2.5。我们认为这可能与Melis等人(2014)在测试依巴谷天体的一些昴星团时发现的较小高估有关。

英文摘要:

We reconsider calibration of statistical distance scales for planetary nebulae, examining precision and systematic error for various distance methods used as well as the scales themselves. A different calibration strategy, one based on precise trigonometric parallaxes by Harris et al. (2007; some improved by Benedict et al. 2009), is presented. Most statistical scales have an overall scale error; in addition, all four tested show dependence of distance ratio [scale/actual] on nebular radius. However, the H-alpha scale of Frew (2008; slightly revised in Frew et al. 2014) has only a small radius dependence at large R and overall is consistent with these parallaxes. Some methods used for calibration have systematic errors, and the extinction method is found to be mostly unreliable. Comparison of Hipparcos parallaxes for a few large planetaries with our "best estimate" distances for those confirms the overestimation of 2.5 found by Harris et al. for PHL 932. We suggest a possible connection with the smaller overestimation found by Melis et al. (2014) when testing Hipparcos parallaxes for some of the Pleiades.

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