A standard stellar library for evolutionary synthesis
A standard stellar library for evolutionary synthesis
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发表时间：
1998
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通讯作者：
T. Lejeune;R. Buser
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作者：
T. Lejeune;R. Buser
提出了一个用于多种合成光度测定应用（包括光谱演化合成）的理论恒星光谱标准库。该网格包括 M 矮星模型光谱，因此补充了论文 I 中建立的第一个库版本（Lejeune 等人，1997）。它涵盖了广泛的基本参数：Te：50 000 K 2000 K、logg：5.5 1 :02 和 (M=H)：+1:0 5 :0。校正程序也适用于理论光谱，以便在大范围的有效温度范围内提供颜色校准的通量分布。为此，在 11500 K 和 2000 K 之间构建了经验 Te{颜色校准，并建立了非太阳丰度的半经验校准 ((M=H )= 3:5 至 +1.0)。在 (UBV)J(RI)CJHKLL 0 M 系统中合成的原始光谱和校正光谱的模型颜色和辐射热校正针对全范围的恒星参数给出。我们发现校正后的光谱提供了经验恒星颜色的更真实的表示，尽管所采用的方法并不完全适应最低温度模型。特别是，金属丰度和/或光度变化所暗示的网格的原始差异颜色在 2500 K 以下不会保留。还讨论了所使用的校正方法的局限性。
A standard library of theoretical stellar spec- tra intended for multiple synthetic photometry appli- cations including spectral evolutionary synthesis is pre- sented. The grid includes M dwarf model spectra, hence complementing the rst library version established in Paper I (Lejeune et al. 1997). It covers wide ranges of fundamental parameters: Te: 50 000 K 2000 K, logg: 5.5 1 :02, and (M=H): +1:0 5 :0. A correction pro- cedure is also applied to the theoretical spectra in or- der to provide color-calibrated flux distributions over a large domain of eective temperatures. For this purpose, empirical Te{color calibrations are constructed between 11500 K and 2000 K, and semi-empirical calibrations for non-solar abundances ((M=H )= 3 :5 to +1.0) are estab- lished. Model colors and bolometric corrections for both the original and the corrected spectra, synthesized in the (UBV)J(RI)CJHKLL 0 M system, are given for the full range of stellar parameters. We nd that the corrected spectra provide a more realistic representation of empiri- cal stellar colors, though the method employed is not com- pletely adapted to the lowest temperature models. In par- ticular the original dierential colors of the grid implied by metallicity and/or luminosity changes are not preserved below 2500 K. Limitations of the correction method used are also discussed.