The Absolute Magnitude of the Sun in Several Filters
The Absolute Magnitude of the Sun in Several Filters
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DOI：
10.3847/1538-4365/aabfdf
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发表时间：
2018-04
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影响因子：
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通讯作者：
C. Willmer
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文献类型：
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作者：
C. Willmer
本文提出了一个表，估计的绝对星等的太阳和转换从vegamag AB和ST系统的几个宽带滤波器中使用的地面和空间为基础的天文台。这些估计使用织女星的无尘光谱能量分布（SED），绝对使用天狼星的SED校准，以设置vegamag零点和太阳的合成光谱，该合成光谱将从紫外到近红外的天基观测与太阳大气模型结合起来。通过比较合成色与太阳类似物的光度测量值，估算了绝对星等的不确定度，结果为0.02mga，结合织女星太阳像仪（Vega SED）标定的0.2%的不确定度，绝对星等的误差为0.3%~ 4%。使用这些SED，对于河外工作中最常用的三个滤波器，在vegamag系统中估计太阳的绝对星等为MB = 5.44，MV = 4.81和MK = 3.27等，在AB系统中为MB = 5.31，MV = 4.80和MK = 5.08等。
This paper presents a table with estimates of the absolute magnitude of the Sun and the conversions from vegamag to the AB and ST systems for several wide-band filters used in ground-based and space-based observatories. These estimates use the dustless spectral energy distribution (SED) of Vega, calibrated absolutely using the SED of Sirius, to set the vegamag zero-points and a composite spectrum of the Sun that coadds space-based observations from the ultraviolet to the near-infrared with models of the Solar atmosphere. The uncertainty of the absolute magnitudes is estimated by comparing the synthetic colors with photometric measurements of solar analogs and is found to be ∼0.02 mag. Combined with the uncertainty of ∼2% in the calibration of the Vega SED, the errors of these absolute magnitudes are ∼3%–4%. Using these SEDs, for three of the most utilized filters in extragalactic work the estimated absolute magnitudes of the Sun are MB = 5.44, MV = 4.81, and MK = 3.27 mag in the vegamag system and MB = 5.31, MV = 4.80, and MK = 5.08 mag in AB.