Discovery and analysis of Gamma Doradus type pulsations in the F0 IV star HR 2740=QW Pup
Discovery and analysis of Gamma Doradus type pulsations in the F0 IV star HR 2740=QW Pup
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F0 IV 星 HR 2740=QW Pup 中伽马剑鱼型脉动的发现和分析
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
H. Haupt
中科院分区：
文献类型：
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作者：
E. Poretti;C. Koen;P. Martinez;Florian Breuer;D. D. Alwis;H. Haupt
我们对F0 IV星星HR 2740=QW Pup进行了多站测光观测，发现它是一颗I³ Dor型变星，脉动频率为1.0434、0.9951、1.1088和0.9019 d-1。这些数据是由欧洲南方天文台和南非天文台在1997年1月14日至2月11日的时间基线上获得的。1.0434-d-1项在振幅（10 mmag）上占主导地位，超过其他三个（每个都小于5 mmag）;包括这四个频率的光变曲线似乎非常稳定，功率谱中没有剩余功率。在分析过程中，特别注意方法方面，考虑到频率接近1 d-1，这一点不容忽视。所有着名的I³ Dor恒星的物理参数也被推导出来，证实这类恒星非常均匀。在这次活动的框架内，还观测到了两颗Ap星（PupiHR 2746和PR PupiHR 2761）。这些旋转变星和HR 2740的光度差异被强调，证实了I³ Dor恒星的脉动性质。它进一步表明，旋转分裂不能是一个合适的解释所观察到的频率内容的HR 2740。© 1997 RAS.
We present multi-site photometric observations of the F0 IV star HR 2740=QW Pup that reveal it to be a I³ Dor type variable pulsating with four frequencies: 1.0434, 0.9951, 1.1088 and 0.9019 d-1. These data were obtained at the European Southern Observatory and the South African Astronomical Observatory over a time baseline spanning from 1997 January 14 to February 11. The 1.0434-d-1 term dominates in amplitude (10 mmag) over the other three (each less than 5 mmag); the light curve comprising these four frequencies seems to be very stable and no residual power is left in the power spectrum. During the analysis particular attention was paid to methodological aspects, which cannot be neglected considering the proximity of the frequencies to 1 d-1. Physical parameters were also derived for all the well-known I³ Dor stars, confirming that this class is very homogenous. In the framework of the campaign, two Ap stars (OU Pupâ�iHR 2746 and PR Pupâ�iHR 2761) were also observed. The photometric differences between these rotating variables and HR 2740 are emphasized, corroborating the pulsational nature of the I³ Dor stars. It is further demonstrated that the rotational splitting cannot be a suitable explanation of the observed frequency content of HR 2740. © 1997 RAS.