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首页> 外文期刊>Astronomy and astrophysics >Pulsations in the late-type Be star HD?50?209 detected by CoRoT
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Pulsations in the late-type Be star HD?50?209 detected by CoRoT

机译：CoRoT检测到最新型Be star HD？50？209的脉动

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Context. The presence of pulsations in late-type Be stars is still a matter of controversy. It constitutes an important issue to establish the relationship between non-radial pulsations and the mass-loss mechanism in Be stars. Aims. To contribute to this discussion, we analyse the photometric time series of the B8IVe star HD50209 observed by the CoRoT mission in the seismology field. Methods. We use standard Fourier techniques and linear and non-linear least squares fitting methods to analyse the CoRoT light curve. In addition, we applied detailed modelling of high-resolution spectra to obtain the fundamental physical parameters of the star. Results. We have found four frequencies which correspond to gravity modes with azimuthal order m=0,-1,-2,-3 with the same pulsational frequency in the co-rotating frame. We also found a rotational period with a frequency of 0.679cd-1 (7.754Hz). Conclusions. HD50209 is a pulsating Be star as expected from its position in the HR diagram, close to the SPB instability strip. Key words: stars: emission line, Be - stars: oscillations - stars: individual: HD50209
机译：上下文。晚期Be星中是否存在脉动仍然是一个有争议的问题。建立非径向脉动与Be恒星质量损失机制之间的关系是一个重要问题。目的为了促进讨论，​​我们分析了CoRoT任务在地震学领域观测到的B8IVe星HD50209的光度时间序列。方法。我们使用标准傅立叶技术以及线性和非线性最小二乘拟合方法来分析CoRoT光曲线。此外，我们应用了高分辨率光谱的详细建模来获得恒星的基本物理参数。结果。我们发现在同向旋转框架中，四个频率分别对应于重力模式，其方位角阶数分别为m = 0，-1，-2，-3。我们还发现了一个旋转周期，其频率为0.679cd-1（7.754Hz）。结论。从其在HR图中的位置开始，HD50209是一颗脉动的Be星，靠近SPB不稳定性带。关键词：恒星：发射线，Be-恒星：振荡-恒星：个体：HD50209

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