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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >CO J = 3-2 Emission from the 'Water Fountain' SourcesIRAS 16342-3814 and IRAS 18286-0959
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CO J = 3-2 Emission from the 'Water Fountain' SourcesIRAS 16342-3814 and IRAS 18286-0959

机译:CO J =来自“喷泉”源的3-2排放IRAS 16342-3814和IRAS 18286-0959

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摘要

We observed CO J = 3-2 emission from "water-fountain" sources, which exhibit high-velocity collimated stellarjets traced by H_2Omaser emission, with the Atacama Submillimeter Telescope Experiment (ASTE) 10 m telescope.We detected CO emission from two sources: IRAS 16342-3814 and IRAS 18286-0959. The IRAS 16342-3814CO emission exhibits a spectrum that could be well fit to a Gaussian profile, rather than to a parabolic profile, witha velocity width (FWHM) of 158 ± 6 km s~(-1)and an intensity peak atVLSR=50 ± 2 km s~(-1).The mass-loss rateof the star is estimated to be ~ 2.9 x 10~(-5)Mo yr~(-1). Our morpho-kinematic models suggest that the CO emissionis optically thin, and associated with a bipolar outflow rather than with a (cold and relatively small) torus. TheIRAS 18286-0959 CO emission has a velocity width (FWHM) of 3.0 ± 0.2 km s~(-1),smaller than typically seen inAGB envelopes. The narrow velocity width of the CO emission suggests that it originates from either an interstellarmolecular cloud or a slowly-rotating circumstellar envelope that harbors the H_2O maser source.
机译:我们使用Atacama亚毫米望远镜实验(ASTE)10 m望远镜观察到“水泉”源的CO J = 3-2排放,这些源表现出由H_2Omaser排放追踪的高速准直恒星喷射。我们从以下两个源中检测到CO排放: IRAS 16342-3814和IRAS 18286-0959。 IRAS 16342-3814CO发射的光谱具有很强的高斯分布,而不是抛物线分布,其速度宽度(FWHM)为158±6 km s〜(-1),强度峰值为VLSR = 50 ±2 km s〜(-1)。恒星的质量损失率估计为2.9 x 10〜(-5)Mo yr〜(-1)。我们的形态运动学模型表明,CO排放在光学上很薄,并且与双极流出有关,而不是与(冷且相对较小的)圆环有关。 IRAS 18286-0959 CO发射的速度宽度(FWHM)为3.0±0.2 km s〜(-1),比AGB信封中的典型值小。 CO排放的狭窄速度宽度表明,它起源于星际分子云或带有H_2O maser源的缓慢旋转的星际包络。

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