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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Correlation between SiO v?=?3 J?=?1 → 0 maser excitation and the light curve of a long-period variable star
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Correlation between SiO v?=?3 J?=?1 → 0 maser excitation and the light curve of a long-period variable star

机译：SiO v？=？3 J == 1→0 maser激发与长周期变星的光曲线之间的相关性

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摘要

In order to understand the excitation mechanisms of silicon monoxide (SiO) masers around long-period variables (LPVs), we have investigated distributions of the SiO v?=?2 and v?=?3 J?=?1 → 0 masers around 12 LPVs by very long baseline interferometry (VLBI) observations with the VLBI Exploration of Radio Astrometry (VERA) and the Nobeyama 45?m telescopes. VLBI fringes of the v?=?3 maser emission were detected for five LPVs. The composite maps of the v?=?2 and v?=?3 masers were made for T?Cep, W?Hya, WX?Psc, and R?Leo using the spectral line phase-referencing technique. The v?=?2 maser spots were distributed in a ring-like form around the central stars, while it is difficult to recognize any specific morphology in the v?=?3 maser distributions due to the small number of v?=?3 spots detected. However in T?Cep, we find that the distribution of the v?=?3 maser spots correlates well with the v?=?2 masers within a few milliarcseconds (0.2–0.3?au) in position and 1?km?s?1 in line-of-sight velocity at the light curve phase of ??=?0.28 (??=?0.0 and 1.0 correspond to the visible light maxima). This correlation implies that the mechanism of line-overlapping between the mid-infrared lines of H2O and SiO molecules works in T?Cep at ??=?0.28. We discuss the possibility that the line-overlapping may work at the limited duration from the maximum to the minimum of the stellar light curve.
机译：为了了解长周期变量（LPV）附近一氧化硅（SiO）激振的激发机理，我们研究了SiO v？=？2和v？=？3 J？=？1→0 masers在周围的分布。通过超长基线干涉测量（VLBI）观测和VLBI射电占星术（VERA）和Nobeyama 45？m望远镜观测到的12个LPV。对于5个LPV，检测到了v 3 ＝π3 maser发射的VLBI条纹。使用谱线相位参考技术，为T？Cep，W？Hya，WX？Psc和R？Leo制作了v？=？2和v？=？3 masers的合成图。 vα=？2 maser点以环状形式分布在中心恒星周围，而由于v？=？3的数量很少，很难识别v？=？3 maser分布中的任何特定形态。检测到斑点。但是，在T？Cep中，我们发现v？=？3 maser点的分布在位置和1？km？s？的几毫秒（0.2-0.3？au）内与v？=？2 masers很好地相关。在Δθ＝Δ0.28的光曲线相位处的视线速度为1（Δθ＝Δ0.0和1.0对应于可见光最大值）。这种相关性暗示H 2 O和SiO分子的中红外线之间的线重叠的机理在Δε＝β0.28的TβCep中起作用。我们讨论了线重叠可能在恒星光曲线的最大值到最小值的有限持续时间内起作用的可能性。

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