arXiv 0904.18222009-04-11astro-ph.SR

年轻恒星天体V645 Cyg的新光谱和干涉研究

A new spectroscopic and interferometric study of the young stellar object V645 Cyg

A. S. Miroshnichenko, K. -H. Hofmann, D. Schertl, G. Weigelt, S. Kraus, N. Manset, L. Albert, Y. Y. Balega, V. G. Klochkova, R. J. Rudy, D. K. Lynch, S. Mazuk, … 展开作者

A. S. Miroshnichenko, K. -H. Hofmann, D. Schertl, G. Weigelt, S. Kraus, N. Manset, L. Albert, Y. Y. Balega, V. G. Klochkova, R. J. Rudy, D. K. Lynch, S. Mazuk, C. C. Venturini, R. W. Russell, K. N. Grankin, R. C. Puetter, R. B. Perry

备注：: 14 pages, 10 figures
DOI：: 10.1051/0004-6361/200810936

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摘要：

我们提出的结果，高分辨率的光学光谱，低分辨率的近红外光谱和近红外散斑干涉的大规模年轻恒星候选人V645 Cyg，获得完善其基本参数和性能的拱星包络。在俄罗斯科学院的6米望远镜上获得了$H$和$K$波段的散斑干涉测量和5200 - 6680 nm范围内的光谱，光谱分辨率为$R$ = 60 000。在3.6-mCFHT处获得了$R$ = 79000的4300 - 10500 nm范围内的另一个光谱。Lick天文台的3米Shane望远镜分别用$R \sim$ 800和$\sim$ 700获得了0.46 - 1.4 $μ$ m和1.4 - 2.5 $μ$ m范围内的低分辨率光谱。使用一种新的运动学方法的基础上的非线性建模的中性氢密度分布的方向上的对象，我们提出了一个距离为$D = 4.2\pm$ 0.2千秒差距。我们还提出了一个修正的恒星有效温度的估计，T $_{\rm eff} \sim$ 25 000 K。我们在$H$-和$K$-波段中分辨了该物体。我们的结论是，天鹅座V645是一个年轻的，大质量的，主序星，最近从茧中出现，已经经历了它的原恒星吸积阶段。吸积的存在对于解释（2 - 6）$\times 10^4$ M $_{\odot}$ yr $^{-1}$的高观测光度并不是必需的。一个强大的，大部分是均匀的外流与终端速度$\sim$ 800公里秒$^{-1}$后退的一部分，只是从远离恒星，在那里禁止线形式的看法被阻止。

英文摘要：

We present the results of high-resolution optical spectroscopy, low-resolution near-IR spectroscopy and near-infrared speckle interferometry of the massive young stellar object candidate V645 Cyg, acquired to refine its fundamental parameters and the properties of its circumstellar envelope. Speckle interferometry in the $H$- and $K$-bands and an optical spectrum in the range 5200--6680 Åwith a spectral resolving power of $R$ = 60 000 were obtained at the 6-m telescope of the Russian Academy of Sciences. Another optical spectrum in the range 4300--10500 Åwith $R$ = 79 000 was obtained at the 3.6-m CFHT. Low-resolution spectra in the ranges 0.46--1.4 $μ$m and 1.4--2.5 $μ$m with $R \sim$ 800 and $\sim$ 700, respectively, were obtained at the 3-m Shane telescope of the Lick Observatory. Using a novel kinematical method based on the non-linear modeling of the neutral hydrogen density profile in the direction toward the object, we propose a distance of $D = 4.2\pm$0.2 kpc. We also suggest a revised estimate of the star's effective temperature, T$_{\rm eff} \sim$25 000 K. We resolved the object in both $H$- and $K$-bands. We conclude that V645 Cyg is a young, massive, main-sequence star, which recently emerged from its cocoon and has already experienced its protostellar accretion stage. The presence of accretion is not necessary to account for the high observed luminosity of (2--6)$\times 10^4$ M$_{\odot}$ yr$^{-1}$. The receding part of a strong, mostly uniform outflow with a terminal velocity of $\sim$800 km s$^{-1}$ is only blocked from view far from the star, where forbidden lines form.

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