一种估算远紫外通量的新方法及邻近恒星形成区中带恒星盘星表的编制
A Novel Method to Estimate the FUV Flux and a Catalogue for Star-Hosting Discs in Nearby Star-Forming Regions
AI总结：
本文提出利用恒星形成区二维成对恒星间距分布推断三维间距以估算FUV通量的新方法，并在合成星团上验证其精度优于以往方法，进而为多个邻近恒星形成区编制带恒星盘FUV通量星表，初步发现盘质量与FUV通量存在负相关迹象。
摘要：
原行星盘在受到OBA型恒星发出的远紫外（FUV）光子外部辐照时，会通过光致蒸发风损失物质，从而减少可用于形成行星的物质总量。要理解环境辐照与观测到的盘性质之间的联系，就需要准确评估带恒星盘处的FUV通量，而由于恒星视差的不确定性，这一评估可能颇具挑战。本文针对这一问题提出了一种新方法：利用恒星形成区的局域密度分布（即二维成对恒星间距分布）并在各向同性假设下，推断带恒星盘与大质量恒星之间的三维间距。我们在合成星团上测试了该方法，结果表明与以往方法相比，其精度显著提高。我们为200 pc范围内7个区域、猎户座6个区域以及Serpens子区域中的大量带星盘样本计算了FUV通量，并提供了一个可公开访问的星表。我们发现，在寄宿晚B型和早A型恒星的区域中，盘所受到的辐照水平对盘演化而言不可忽略（10–100 G0）。我们研究了尘埃盘质量与FUV通量的关系，在限定于区域平均年龄时检测到负相关的迹象。然而，我们强调需要在>10^2 G0条件下获得更多恒星和盘的测量数据，以探究盘性质对环境辐照的依赖。计入平均星际尘埃消光后，中位FUV通量并未显著衰减，尽管若能得到高分辨率三维尘埃消光图，这一结果可能会改变。本文所提出的方法是一种强有力的工具，可扩展到更多区域。
英文摘要：
Protoplanetary discs, when externally irradiated by Far Ultraviolet (FUV) photons from OBA-type stars, lose material through photoevaporative winds, reducing the amount of material available to form planets. Understanding the link between environmental irradiation and observed disc properties requires accurately evaluating the FUV flux at star-hosting discs, which can be challenging due stellar parallax uncertainties. In this paper, we address this issue proposing a novel approach: using the local density distribution of a star-forming region (i.e. 2D pairwise star separations distribution) and assuming isotropy, we infer 3D separations between star-hosting discs and massive stars. We test this approach on synthetic clusters, showing that it significantly improves the accuracy compared to previous methods. We compute FUV fluxes for a large sample of star-bearing discs in 7 regions within 200 pc, 6 regions in Orion, and Serpens sub-regions, providing a publicly accessible catalogue. We find that discs in regions hosting late-type B and early-type A stars can reach non-negligible irradiation levels for disc evolution (10-100 G0). We investigate dust disc masses relative to FUV fluxes detecting hints of a negative correlation when restricting to average region ages. However, we emphasize the need for more stellar and disc measurements at >10^2 G0 to probe the dependence of disc properties on the environmental irradiation. Including average interstellar dust extinction, median FUV fluxes are not significantly attenuated, though this result may change if high-resolution 3D dust extinction maps were available. The method presented in this work is a powerful tool that can be expanded to additional regions.
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。
