Data used for FAINT WHITE DWARF FLUX STANDARDS: DATA AND MODELS

HST PIDs 12967, 13711, 15113, and 16764.

Abstract:

Fainter standard stars are essential for the calibration of larger telescopes. This work adds to the CALSPEC (calibration spectra) database 19 faint white dwarfs (WDs) with all-sky coverage and V magnitudes between 16.5 and 18.7. Included for these stars is new UV (ultraviolet) HST (Hubble Space Telescope) STIS (Space Telescope Imaging Spectrometer) spectrophotometry between 1150 and 3000 ̊A with a resolution of ∼500. Pure hydrogen WD models are fit to these UV spectra and to six-band HST/WFC3 (Wide Field Camera 3) photometry at 0.28 to 1.6 μm to construct predicted model SEDs (spectral energy distributions) covering wavelengths from 900 ̊A to the JWST (James Webb Space Telescope) limit of 30 μm using well-established CALSPEC procedures for producing flux standards with the goal of 1% accuracy.

哈勃空间望远镜（Hubble Space Telescope, HST）项目编号12967、13711、15113及16764。

摘要：
暗弱标准星对于大型望远镜的校准工作至关重要。本研究为CALSPEC（校准光谱，calibration spectra）数据库新增19颗覆盖全天域、V星等介于16.5至18.7之间的暗弱白矮星（white dwarfs, WDs）。针对这些恒星，本研究获取了波长1150至3000埃的全新紫外线（ultraviolet, UV）波段哈勃空间望远镜STIS（空间望远镜成像光谱仪，Space Telescope Imaging Spectrometer）分光光度观测数据，分辨率约为500。研究采用成熟的CALSPEC标准通量星制作流程，将纯氢白矮星模型与上述紫外光谱以及0.28至1.6微米波段的六波段哈勃空间望远镜/广角相机3（Wide Field Camera 3, WFC3）测光数据进行拟合，构建覆盖900埃至詹姆斯·韦布空间望远镜（James Webb Space Telescope, JWST）30微米探测极限的预测模型光谱能量分布（spectral energy distributions, SEDs），目标通量校准精度可达1%。