THE DETECTION OF INFRARED SiS BANDS IN SPECTRA OF S STARS

THE DETECTION OF INFRARED SiS BANDS IN SPECTRA OF S STARS
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S星光谱中红外SiS波段的检测

DOI:
10.1088/0004-637x/690/2/l122
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发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Cami J
Cami J
中科院分区:
--
文献类型:
--
作者:
Cami J

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我们给出了S星的斯皮策光谱,S星是C/O比接近1的冷演化恒星,其中一些S过程丰度增强。我们在n波段窗口内,在13 μm的中红外波段探测到一个强而不寻常的波段。利用量子化学计算的谱线表和模型光谱,我们确定了这个波段是si的基本旋转振动带。在6.7 μm的泛音波段检测证实了这一识别。拟合谱线显示分子位于相对较冷的层中,温度为T ~ 1500 K。我们在化学平衡模型的背景下讨论这些结果。在温度较低的S型恒星中观测到的这些波段的强度使它们成为研究褐矮星和系外行星大气的一个很有前途的观测诊断工具。
We present Spitzer spectra of S stars, which are cool evolved stars with a C/O ratio near unity, some of which have enhanced s-process abundances. We present the detection of a strong and unusual band in the mid-infrared, at 13 μm, within the N-band window. Using quantum-chemically calculated line lists, and model spectra, we identify this band as the fundamental rovibrational band of SiS. Detection of the overtone band at 6.7 μm confirms the identification. Fitting the line profile shows that the molecule is located in relatively cool layers, at T∼ 1500 K. We discuss these results in the context of chemical equilibrium models. The observed strength of these bands in the cool S stars makes them a promising observational diagnostic tool for studying the atmospheres of brown dwarfs and exoplanets.
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