疏散星团M67上的多站点活动。III。蓝色离散星中的盾牌座δ脉冲
Multisite campaign on the open cluster M67. III. Delta Scuti pulsations in the blue stragglers
摘要：
我们对疏散星团M67中的可变蓝离散星进行了星震分析。该数据集由来自八个地点的光度时间序列组成，使用九台0.6-2.1米望远镜，时间基线为43天。在两颗恒星，EW Cnc和EX Cnc，我们检测到的频率（41和26）属于一个星团的三角洲盾牌座恒星检测到的最高数量，和EW Cnc的任何三角洲盾牌座恒星检测到的频率的第二高数量。我们已经计算了一个网格的脉动模型，考虑到旋转的影响。观测和理论频率的分布表明，在一个很宽的频率范围内的径向和非径向的低阶模式的显着比例被激发到可检测的振幅。尽管观测到了大量的频率，但我们无法限制恒星的基本参数。为了取得进展，我们需要从多色测光或光谱学中识别某些模式的程度。
英文摘要：
We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time series from eight sites using nine 0.6-2.1 meter telescopes with a time baseline of 43 days. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in delta Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any delta Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies show that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes either from multi-colour photometry or spectroscopy.
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