Blackbody Stars
Blackbody Stars
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DOI：
10.3847/1538-3881/aac88b
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
N. Suzuki;Masataka Fukugita
中科院分区：
文献类型：
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作者：
N. Suzuki;Masataka Fukugita
我们报告发现的恒星，显示光谱非常接近黑体辐射。我们在斯隆数字巡天（SDSS）光谱数据档案中的798，593颗恒星中发现了17颗这样的恒星。我们讨论了这些恒星的测光校准的价值，无论这些恒星的物理性质。这给了我们一个机会，以检查在各个通带的SDSS测光零点的准确性：我们得出结论，SDSS测光系统的零点是内部一致的，在其五个通带的水平低于0.01马格。我们也可以检查银河演化探测器和SDSS的紫外测光之间的一致性零点，和红外测光宽视场红外巡天探测器对SDSS。这些恒星不仅可以作为光度标准星，也可以作为分光光度标准星。我们认为，这些恒星显示出无特征的黑体光谱的有效温度为10000 ± 1500 K是一致的DB白色矮星的温度太低，发展氦吸收功能。
We report the discovery of stars that show spectra very close to blackbody radiation. We found 17 such stars out of 798,593 stars in the Sloan Digital Sky Survey (SDSS) spectroscopic data archives. We discuss the value of these stars for the calibration of photometry, regardless of the the physical nature of these stars. This gives us a chance to examine the accuracy of the zero point of SDSS photometry across various passbands: we conclude that the zero point of SDSS photometric system is internally consistent across its five passbands to the level below 0.01 mag. We may also examine the consistency of the zero points between UV photometry of Galaxy Evolution Explorer and SDSS, and IR photometry of Wide-field Infrared Survey Explorer against SDSS. These stars can be used not only as photometric but also spetrophotometric standard stars. We suggest that these stars showing the featureless blackbody-like spectrum of the effective temperature of 10000 ± 1500 K are consistent with DB white dwarfs with temperatures too low to develop helium absorption features.