AI 中文总结
研究针对近红外和中红外波长地面获取微弱源精确通量的挑战，提出结合多种数据构建STARSFLUX全天空目录的方法，经多测试验证，其校准源光谱及导出角直径可用于相关观测，提高通量校准精度。
AI 中文摘要
在近红外和中红外波长从地面获取微弱源的精确通量具有挑战性，因为大气吸收快速变化，且常受附近分光光度校准源缺乏的限制。我们展示了恒星绝对参考光谱通量库（STARSFLUX），这是一个基于中红外恒星直径和通量汇编目录（MDFC）的全天空目录，包含64484个校准源光谱，范围为0.3 - 30μm。STARSFLUX结合了盖亚DR3恒星参数、来自太空和地面调查的多波段测光以及合成的新时代凤凰大气模型。对于每颗恒星，我们用插值模型光谱、角直径和消光来拟合观测到的SED，以产生绝对通量校准光谱。导出的角直径也可用于校准干涉测量观测。我们使用三个独立测试来验证该目录。首先，STARSFLUX角半径与盖亚DR3半径密切一致，中值$|\Delta R|/R_{\rm Gaia,DR3} \simeq 4.8\%$。其次，与科恩红外标准中12颗共同恒星的积分L波段（2.8 - 4.2μm）通量与科恩值一致，平均绝对百分比差异为$4.7 \pm 2.6\%$。第三，与盖亚DR3 BP/RP光谱比较表明，近紫外/可见/近红外绝对分光光度通量一致约3%。FITS光谱可在这个https URL获取，并将提交给VizieR。
英文摘要
Obtaining accurate fluxes for faint sources from the ground at near- and mid-infrared wavelengths is challenging because of rapidly varying atmospheric absorption, and is often limited by the lack of a nearby spectro-photometric calibrator. We present the STellar Absolute Reference Spectroscopic Flux Library (STARSFLUX), an all-sky catalogue of 64,484 calibrator spectra spanning 0.3--30 $μ$m, based on the Mid-infrared stellar Diameters and Fluxes compilation Catalogue (MDFC). STARSFLUX combines Gaia DR3 stellar parameters, multi-band photometry from space- and ground-based surveys, and synthetic NewEra PHOENIX atmosphere models. For each star, we fit the observed SED with an interpolated model spectrum, angular diameter, and extinction to produce an absolutely flux-calibrated spectrum. The derived angular diameters can also be used to calibrate interferometric observations. We validate the catalogue using three independent tests. First, STARSFLUX angular radii agree closely with Gaia DR3 radii, with a median $|ΔR|/R_{\rm Gaia,DR3} \simeq 4.8$ per cent. Second, integrated L-band (2.8--4.2 $μ$m) fluxes for 12 stars in common with the Cohen infrared standards agree with Cohen values with a mean absolute percentage difference of $4.7 \pm 2.6$ per cent. Third, comparison with Gaia DR3 BP/RP spectra shows that the near-UV/visible/near-IR absolute spectro-photometric fluxes agree to approximately 3 per cent. The FITS spectra are available at https://home.strw.leidenuniv.nl/~gamez/ and will be submitted to VizieR.
CommentsSubmitted to Monthly Notices of the Royal Astronomical Society
Journal refMon Not R Astron Soc (2026)
