The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity
The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity
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DOI：
10.1093/mnras/stw2708
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发表时间：
2016-10
影响因子：
4.8
通讯作者：
S. Goldman;J. V. Loon;A. Zijlstra;J. Green;P. Wood;A. Nanni;H. Imai;P. Whitelock;M. Matsuura-M.-Ma
中科院分区：
文献类型：
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作者：
S. Goldman;J. V. Loon;A. Zijlstra;J. Green;P. Wood;A. Nanni;H. Imai;P. Whitelock;M. Matsuura-M.-Ma
本文报道了大麦哲伦星云中渐近巨星分支（AGB）和红超巨星（RSG）1612 MHz星周OH脉泽辐射的观测结果。我们在大麦哲伦星云中发现了四个新的星周脉泽源，并将大麦哲伦星云中红外星的可靠风速从5个增加到13个。利用我们的新风速，以及来自银河系的风速，我们推导出了尘埃驱动风的更新关系：vexp /ZL 0：4。我们比较了亚太阳的金属丰度LMC OH/IR星与精心挑选的样品更富含金属的OH/IR星，也在已知的距离，在银河系中心和银河系隆起。对于8的膨胀星，我们推导出脉动周期的第一次，使用近红外测光的VVV调查。我们已经模拟了我们的LMC OH/IR星，并开发了一种经验方法，推导出气体尘埃比和质量损失率的模型，从脉泽配置文件的结果。我们还对银河系中心和膨胀区的样品做了这一工作，并导出了一个新的质量损失公式，其中包括光度、脉动周期和气尘比_M = 1：06+3：5
We present the results of our survey of 1612 MHz circumstellar OH maser emission from asymptotic giant branch (AGB) stars and red supergiants (RSGs) in the Large Magellanic Cloud. We have discovered four new circumstellar maser sources in the LMC, and increased the number of reliable wind speeds from IR stars in the LMC from 5 to 13. Using our new wind speeds, as well as those from Galactic sources, we have derived an updated relation for dust driven winds: vexp / ZL0:4. We compare the sub-solar metallicity LMC OH/IR stars with carefully selected samples of more metal-rich OH/IR stars, also at known distances, in the Galactic Centre and Galactic Bulge. For 8 of the Bulge stars we derive pulsation periods for the first time, using near-IR photometry from the VVV survey. We have modeled our LMC OH/IR stars and developed an empirical method of deriving gas-to-dust ratios and mass loss rates by scaling the models to the results from maser profiles. We have done this also for samples in the Galactic Centre and Bulge and derived a new mass loss prescription that includes luminosity, pulsation period, and gas-to-dust ratio _M = 1:06+3:5