利用多星表交叉外推恒星能量的方法研究
投稿时间:2018-10-14  修订日期:2019-03-20  点此下载全文
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作者单位E-mail
王誉都 中国科学院大学 wangyudu@gmai.com 
孙小进 中国科学院上海技术物理研究所  
陈凡胜 中国科学院上海技术物理研究所 cfs@mail.sitp.ac.cn 
中文摘要:基于恒星的能量光谱虽然已被广泛研究,但是大多是基于少数特定的标准定标星。为了获取满足特定探测器工作谱段的恒星能量,本文提出了一种基于多星表数据的恒星能量外推方法,利用IRAS、WISE和2MASS星表数据交叉校验,将已有的高精度恒星谱段能量转化为相机的任意工作谱段。该模型简化了外推过程,提高了外推效率,实现对70%的恒星外推精度3%以内,达到了Cohen等人对Vega和Sirius长期观测得到的相同结果,并给出一个可用于辐射定标的星表。在恒星定标时可以根据模型外推结果选择更适合探测器的多恒星数据。
中文关键词:恒星定标  能量外推  星表  普朗克定律
 
A new approach for extrapolating star flux using cross-matching multiple catalogues
Abstract:Although the spectral energy distributions (SEDs) of stars based on a few of specific calibration star are widely studied, the models they used cannot satisfy all bands of the specific detector. This paper presents a model for extrapolating flux from cross-matching multiple catalogues combining the data of IRAS, WISE and 2MASS, which used the Planck’s law to extrapolate flux to every band. The model simplifies the extrapolation process, and improves the extrapolation efficiency with a high precision of 3% for 70% of the stars. Our finding is in agreement with the independent long-term observation of the Vega and Sirius star reported by Cohen et al. According to the extrapolation results, more suitable multiple data of stars could be selected for star calibration.
keywords:Star calibration  Flux extrapolation  Star catalogues  Planck’s law
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