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arXiv 1006.2848astro-ph.SR
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关于前主序星[ NeII ] 12.81微米发射的起源：喷流、喷流和吸积

On the origin of [NeII] 12.81 micron emission from pre-main sequence stars: Disks, jets, and accretion

M. Guedel, F. Lahuis, K. R. Briggs, J. Carr, A. E. Glassgold, Th. Henning, J. R. Najita, R. van Boekel, E. van Dishoeck

备注：
accepted for Astronomy & Astrophysics, 25 pages, 11 figures - revisions: affiliation added, NeII flux unit in Table 3 corrected
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摘要：

我们对92颗前主序星的[NeII]线辐射进行了研究，其中包括13颗吸积过渡盘天体和14颗驱动喷流和外流的天体。我们发现几个显着的L[NeII]和恒星参数之间的相关性，特别是LX和风的质量损失率，dM/dt。然而，大多数相关性强烈地受系统分散的支配。虽然L[NeII]和LX之间存在正相关性，但恒星质量吸积率dMacc/dt只有在我们将喷流源和没有喷流的恒星的不同子集结合起来时才会产生相关性。我们的研究结果表明，L[NeII]是双峰分布，两个子样本的单独分布。喷流源显示出系统性的高L[NeII]，相对于没有喷流的物体，高出1-2个数量级。喷流驱动的恒星也往往表现出更高的质量吸积率。因此，我们假设dMacc/dt的趋势反映了dM/dt的趋势，该趋势与[NeII]排放更具有物理相关性。L[NeII]测量的对象没有已知的流出和射流被发现同意从磁盘表面层的[NeII]发射的简化计算，如果测量的恒星X射线是负责加热和电离的气体。在L[NeII]中的大散射可能是由磁盘属性和辐照光谱的变化引起的，如前所述。从喷流源系统增强[NeII]通量清楚地表明了喷流本身的作用，如前所述的空间分辨观测T Tau三元组的外流系统。

英文摘要：

(Abridged) We have conducted a study of [NeII] line emission based on a sample of 92 pre-main sequence stars mostly belonging to the infrared Class II, including 13 accreting transition disk objects and 14 objects driving jets and outflows. We find several significant correlations between L[NeII] and stellar parameters, in particular LX and the wind mass loss rate, dM/dt. Most correlations are, however, strongly dominated by systematic scatter. While there is a positive correlation between L[NeII] and LX, the stellar mass accretion rate, dMacc/dt, induces a correlation only if we combine the largely different subsets of jet sources and stars without jets. Our results suggest that L[NeII] is bi-modally distributed, with separate distributions for the two subsamples. The jet sources show systematically higher L[NeII], by 1-2 orders of magnitude with respect to objects without jets. Jet-driving stars also tend to show higher mass accretion rates. We therefore hypothesize that the trend with dMacc/dt reflects a trend with dM/dt that is more physically relevant for [NeII] emission. L[NeII] measured for objects without known outflows and jets is found to agree with simplified calculations of [NeII] emission from disk surface layers if the measured stellar X-rays are responsible for heating and ionizing of the gas. The large scatter in L[NeII] may be introduced by variations of disk properties and the irradiation spectrum, as previously suggested. The systematically enhanced [NeII] flux from jet sources clearly suggests a role for the jets themselves, as previously demonstrated by a spatially resolved observation of the outflow system in the T Tau triple.

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