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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Near-infrared spectra of 29 carbon stars: Simple estimates of effective temperature
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Near-infrared spectra of 29 carbon stars: Simple estimates of effective temperature

机译：29个碳星的近红外光谱：有效温度的简单估算

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摘要

Near-infrared spectra of 29 carbon stars in the 0.9-2.4 mu m range were obtained by using a cross-dispersed echelle spectrograph. The target stars, which were classified into C-H, C-R, C-J, and C-N types, were selected from an atlas of Barnbaum, Stone, and Keenan (1996, ApJS, 105, 419). Because the stars are non long-period variables, the phase differences of the light curves do not strongly affect the spectra. The effective temperatures (T-eff) of the carbon stars were estimated with errors of +/- 200 K by fitting our spectra at wavelengths of 1.35, 1.74, and 2.29,mu m, with simple model spectra, while considering the H- opacity minimum to be around 1.6 mu m. At these wavelengths, molecular absorption due to CO, CN, and C-2 is not strong. The derived effective temperatures are distributed between 5 100 K and 2600 K, and highly correlate with the temperature sequence in Barnbaum, Stone, and Keenan (ibid.), although the stars with temperature sequences beyond 4 have similar temperatures near similar to 3000 K. We also compared our results with values derived by other methods in the literature: the aperture diameter method, the infrared flux method, and some model calculations.
机译：通过使用交叉分散的埃歇尔光谱仪获得了在0.9-2.4微米范围内的29个碳星的近红外光谱。从Barnbaum，Stone和Keenan（1996，ApJS，105，419）地图集中选择了分为C-H，C-R，C-J和C-N型的目标恒星。由于恒星不是长期变量，因此光曲线的相位差不会强烈影响光谱。碳星的有效温度（T-eff）通过将我们在1.35、1.74和2.29μm波长处的光谱与简单的模型光谱拟合，同时考虑了H-不透明性，估计误差为+/- 200 K最小为1.6微米左右。在这些波长下，由于CO，CN和C-2引起的分子吸收不强。得出的有效温度分布在5100 K和2600 K之间，并且与Barnbaum，Stone和Keenan的温度序列高度相关（同上），尽管温度序列超过4的恒星具有相似的温度，接近3000K。我们还将结果与文献中其他方法得出的值进行了比较：孔径方法，红外通量方法和一些模型计算。

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