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首页> 外文期刊>Astronomy and astrophysics >Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD?50064
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Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD?50064

机译：热巨人HD？50064中由于振幅可变的振荡模式而导致的周期性质量损失事件

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Aims. We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD50064 (V=8.21). Methods. CoRoT space photometry and follow-up high-resolutionspectroscopy with a time base of 137d and 169d,respectively, was gathered, analysed, and interpreted using standardtime series analysis and light curve modelling methods, as well asspectral line diagnostics. Results. The space photometry reveals one period of 37d,which undergoes a sudden amplitude change with a factor 1.6. Thepulsation period is confirmed in the spectroscopy, which additionallyreveals metal line radial velocity values differing by 30kms-1 depending on the spectral line and on the epoch. We estimate K, from the equivalent width of Si lines. The Balmer lines reveal that thestar undergoes episodes of changing mass loss on a time scale similarto the changes in the photometric and spectroscopic variability, withan average value of (in yr-1). We tentatively interpret the 37d period as the result of a strange mode oscillation. Key words: asteroseismology - stars: oscillations - stars: winds, outflows - stars: individual: HD50064 - stars: atmospheres - supergiants
机译：目的我们旨在解释夜光蓝色变量超巨型HD50064（V = 8.21）的光度和光谱变异性。方法。使用标准时间序列分析和光曲线建模方法以及光谱线诊断，分别收集，分析和解释了CoRoT空间光度法和时基分别为137d和169d的高分辨率光谱。结果。空间光度法揭示了一个37d的周期，该周期经历了一个突然的幅度变化，幅度为1.6。脉动周期在光谱学中得到确认，该谱学还揭示了根据谱线和历时相差30kms-1的金属线径向速度值。我们根据Si线的等效宽度估算K。巴尔默线表明，该恒星在一段时间内经历了质量损失的变化，类似于光度和光谱变异性的变化，其平均值为（yr-1）。我们尝试将37d周期解释为奇怪的模式振荡的结果。关键词：地震学-恒星：振荡-恒星：风，流出-恒星：个人：HD50064-恒星：大气-超巨星

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