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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Near-infrared spectroscopic monitoring observations of three yellow hypergiants and time variation of 2.3 mu m CO features of rho cassiopeia
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Near-infrared spectroscopic monitoring observations of three yellow hypergiants and time variation of 2.3 mu m CO features of rho cassiopeia

机译：3种黄色超巨生菌的近红外光谱监测观察及rho Cassiopeia的2.3μm CO特征时变

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摘要

We made spectroscopic monitoring observations of the three yellow hypergiants (rho Cassiopeia, HR 8752, and IRC+10420) in the 0.9-2.4 Am wavelength range with a resolution of similar to 2600 over a fifteen month period. The spectra of HR 8752 and IRC+10420 showed no time variations. On the other hand, those of p Cas showed just a series of time variation in 2.3 mu m CO features from nondetection to absorption through emission during 2002-2004. We interpret this variation as being a result of an expanding gas shell whose excitation temperature was being cooled down to similar to 800 K. The CO column densities were estimated from the CO absorption depths. Moreover, assuming spherical symmetry of the expanding shell with a constant expansion velocity of 35 klm s(-1), a stellar effective temperature of 7000 K, a stellar radius of 400 R-circle dot, solar abundance, and all carbon atoms forming CO molecules, we estimated the mass of the shell to be similar to 2 x 10-3M(circle dot) for a model with a single shell expanding from the photosphere, or similar to 5 x 10(-4) M-circle dot for another model with an expanding shell and a static envelope. These estimates of the released mass strongly depend on assumptions of the expansion velocity, the abundance, and the dissociation of the CO molecules.
机译：我们在0.9-2.4 Am的波长范围内对三种黄色超巨细胞（rho仙后座，HR 8752和IRC + 10420）进行了光谱监视观察，在15个月的时间内分辨率接近2600。 HR 8752和IRC + 10420的光谱没有时间变化。另一方面，在2002-2004年期间，p Cas的碳特征仅显示了2.3μmCO的一系列时间变化，从未发现到吸收再到通过发射的吸收。我们将这种变化解释为气体壳膨胀的结果，该气体壳的激发温度被冷却至接近800K。CO柱密度是根据CO吸收深度估算的。此外，假设膨胀壳的球对称性以35 klm s（-1）的恒定膨胀速度，恒星有效温度为7000 K，恒星半径为400 R-圆点，太阳丰度和所有形成CO的碳原子分子，对于一个具有从光球扩展的单个壳的模型，我们估计壳的质量类似于2 x 10-3M（圆点），对于另一个模型，我们估计其质量与5 x 10（-4）M圆点相似带有扩展壳和静态包络的模型。这些释放质量的估计值在很大程度上取决于对CO分子的膨胀速度，丰度和解离的假设。

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