arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.4381astro-ph.SR
收藏

HST分光光度法和太阳类似物模型

HST Spectrophotometry and Models for Solar Analogs

R. C. Bohlin

备注：
19 pages, 2 tables, 7 figures; to appear in AJ 2010 April
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

用HST分光光度法测量了7颗太阳模拟星在0.3 ~ 2.5 μm波段的绝对通量分布，为了预测JWST定标所需的较长波长的中红外通量，用Castelli & Kurucz模型大气拟合了HST SEDs，并与MARCS模型网格拟合的结果进行了比较。两个模型网格的最佳拟合的10个宽带箱的均方根残差均<0.5%。然而，拟合系统地不同：MARCS拟合在T_{eff}中热40-100 K，log g高0.25-0.80，log z高0.01-0.10，红化E（B-V）高0.008-0.021，可能是因为它们的规格包括不同的金属丰度。尽管拟合的参数存在这些差异，但预测的中红外通量仅相差约1%;这些G星的模拟通量分布在30 μm范围内的估计总体准确度为2%。

英文摘要：

Absolute flux distributions for seven solar analog stars are measured from 0.3 to 2.5 μm by HST spectrophotometry.In order to predict the longer wavelength mid-IR fluxes that are required for JWST calibration, the HST SEDs are fit with Castelli & Kurucz model atmospheres; and the results are compared with fits from the MARCS model grid. The rms residuals in 10 broad band bins are all <0.5% for the best fits from both model grids. However, the fits differ systematically: The MARCS fits are 40-100 K hotter in T_{eff}, 0.25-0.80 higher in log g, 0.01-0.10 higher in log z, and 0.008-0.021 higher in the reddening E(B-V), probably because their specifications include different metal abundances. Despite these differences in the parameters of the fits, the predicted mid-IR fluxes differ by only ~1%; and the modeled flux distributions of these G stars have an estimated ensemble accuracy of 2% out to 30 μm.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑