γ Dor CoRoT靶向HD49434。一.地面活动的结果
The gamma Dor CoRoT target HD49434. I-Results from the ground-based campaign
摘要：
背景：我们提出了对伽马Dor CoRoT目标HD 49434进行广泛的地面光度和光谱活动的结果。这一活动是为2007年10月至2008年3月进行的CoRoT卫星观测做准备。结果如下：频率分析清楚地表明，在0.2-1.7 c/d区间存在四个频率，以及在5-12 c/d域存在六个频率。低频是gamma Dor变量的典型频率，而高频是delta Sct变量的常见频率。我们建议频率2.666 c/d作为可能的旋转频率。所有的模式，其识别是可能的，似乎是高次模式（3 <= 1 <= 8）。我们没有发现HD 49434可能具有二进制性质的证据。我们推导出的元素丰度与以前的分析中获得的值是一致的。结论：我们将伽马Dor星HD 49434归类为混合型脉冲发生器，它同时以p和g模式脉动。这一发现使HD 49434成为一个非常有趣的小行星地震模型目标。观测：根据欧洲南方天文台大方案（LP 178.D-0361）下在拉西拉天文台使用2.2米欧洲南方天文台/多学科望远镜进行的观测。也是根据内华达山脉天文台（西班牙）、卡拉尔阿尔托西班牙阿莱曼天文中心（西班牙）、圣佩德罗马蒂尔国家天文台（墨西哥）、孔科利天文台皮斯克斯泰托山站（匈牙利）、上普罗旺斯天文台（法国）和约翰山大学天文台（新西兰）的观测结果。
英文摘要：
Context: We present the results of an extensive ground-based photometric and spectroscopic campaign on the gamma Dor CoRoT target HD49434. This campaign was preparatory to the CoRoT satellite observations, which took place from October 2007 to March 2008. Results: The frequency analysis clearly shows the presence of four frequencies in the 0.2-1.7 c/d interval, as well as six frequencies in the 5-12 c/d domain. The low frequencies are typical for gamma Dor variables while the high frequencies are common for delta Sct pulsators. We propose the frequency 2.666 c/d as a possible rotational frequency. All modes, for which an identification was possible, seem to be high-degree modes (3 <= l <= 8). We did not find evidence for a possible binary nature of HD49434. The element abundances we derived are consistent with the values obtained in previous analyses. Conclusions: We classify the gamma Dor star HD49434 as a hybrid pulsator, which pulsates simultaneously in p- and g-modes. This finding makes HD49434 an extremely interesting target for asteroseismic modelling. Observations: Based on observations made with the 2.2m ESO/MPI telescope at the La Silla Observatory under the ESO Large Programme: LP178.D-0361. Also based on observations obtained at Observatorio de Sierra Nevada (Spain), at the Centro Astronomico Hispano Aleman at Calar Alto (Spain), at Observatorio Astronomico Nacional San Pedro Martir (Mexico), at the Piszkesteto Mountain Station of Konkoly Observatory (Hungary), at Observatoire de Haute Provence (France) and at Mount John University Observatory (New Zealand).
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