盾牌座δ 7 Aql和8 Aql（一个新的盾牌座δ变星）的多点观测：2003年第十二次STEPHI活动
Multi-site observations of Delta Scuti stars 7 Aql and 8 Aql (a new Delta Scuti variable): The twelfth STEPHI campaign in 2003
摘要：
本文分析了2003年6月至7月在STEPHI XII活动框架内观测到的一颗新的变星-盾牌座δ 7 Aql（HD 174532）和8 Aql（HD 174589）的脉动行为。在21天的时间里，在三个大陆的三个地点使用四通道光度计获得了183小时的高精度测光。光变曲线和振幅谱是按照经典的多通道光度学方案获得的。还获得并分析了不同过滤器中的观察结果。在7Aql和8Aql中，分别在0.090mHz-0.300mHz和0.100mHz-0.145mHz范围内，在99%置信水平以上明确地检测到六个和三个频率。观测和理论频率的比较表明，7 Aql和8 Aql可能振荡与低径向阶的p模式，典型的盾牌座δ恒星。在径向振荡方面，8Aql的范围从n=1到n=3，而对于7Aql，范围从n=4到n=7。非径向振荡也必须存在于两颗恒星中。根据非绝热分析，两颗恒星的激发模式的预期范围从n=1到n=6。
英文摘要：
We present an analysis of the pulsation behaviour of the Delta Scuti stars 7 Aql (HD 174532) and 8 Aql (HD 174589) -- a new variable star -- observed in the framework of STEPHI XII campaign during 2003 June--July. 183 hours of high precision photometry were acquired by using four-channel photometers at three sites on three continents during 21 days. The light curves and amplitude spectra were obtained following a classical scheme of multi-channel photometry. Observations in different filters were also obtained and analyzed. Six and three frequencies have been unambiguously detected above a 99% confidence level in the range 0.090 mHz--0.300 mHz and 0.100 mHz-- 0.145 mHz in 7 Aql and 8 Aql respectively. A comparison of observed and theoretical frequencies shows that 7 Aql and 8 Aql may oscillate with p modes of low radial orders, typical among Delta Scuti stars. In terms of radial oscillations the range of 8 Aql goes from n=1 to n=3 while for 7 Aql the range spans from n=4 to n=7. Non-radial oscillations have to be present in both stars as well. The expected range of excited modes according to a non adiabatic analysis goes from n=1 to n=6 in both stars.
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