Subpercent Photometry: Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories-猫眼课题宝

DOI：

10.3847/1538-4365/ab0557

发表时间：

2018-11

期刊：

The Astrophysical Journal Supplement Series

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

G. Narayan;T. Matheson;A. Saha;T. Axelrod;A. Calamida;E. Olszewski;J. Claver;K. Mandel;R. Bohlin;J. Holberg;S. Deustua;A. Rest;C. Stubbs;C. Shanahan;A. Vaz;A. Zenteno;G. Strampelli;I. Hubeny;S. Points;E. Sabbi;J. Mackenty

我们已经建立了一个由19颗暗（16.5等< V < 19等）的北方和赤道DA白色矮星（WD）组成的网络，作为现在和未来宽视场天文台的分光光度标准。我们的分析推断光谱能量分布（SED）模型的恒星，是绑在三个CALSPEC的主要标准。我们的SED模型与全色哈勃空间望远镜测光一致，优于1%。观测和模型之间的良好一致性验证了使用非LTE DA WD大气熄灭星际尘埃作为准确的分光光度参考。我们的标准可从两个半球获得，适用于地面和空间观测站，覆盖紫外线到近红外线。这些微弱源的高精度使我们的标准网络非常适合任何对通量校准有非常严格要求的实验，例如使用大型综合巡天望远镜和宽视场红外巡天望远镜进行暗能量研究。

We have established a network of 19 faint (16.5 mag < V < 19 mag) northern and equatorial DA white dwarfs (WDs) as spectrophotometric standards for present and future wide-field observatories. Our analysis infers spectral energy distribution (SED) models for the stars that are tied to the three CALSPEC primary standards. Our SED models are consistent with panchromatic Hubble Space Telescope photometry to better than 1%. The excellent agreement between observations and models validates the use of non-LTE DA WD atmospheres extinguished by interstellar dust as accurate spectrophotometric references. Our standards are accessible from both hemispheres and suitable for ground- and space-based observatories covering the ultraviolet to the near-infrared. The high precision of these faint sources makes our network of standards ideally suited for any experiment that has very stringent requirements on flux calibration, such as studies of dark energy using the Large Synoptic Survey Telescope and the Wide-field Infrared Survey Telescope.

Subpercent Photometry: Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories

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