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EQ Eridani, a Multiperiodic δ Scuti Star

机译:EQ Eridani,多周期δShield星

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摘要

DSLR photometry of the δ Scuti star EQ Eridani (HD 28665) was undertaken on six nights between 2 November and 8 December 2013. Comparison and check stars were HD 28508 and HD 28901, respectively. Inspection of the light curves revealed an irregular pattern and variation in amplitude that signified the presence of two or more periods. Fourier analysis using the software period04 yielded at least three pulsation frequencies of 14.3663, 11.6862, and 7.2128 cycles per day, corresponding to periods of 0.0696, 0.0856, and 0.1386 day, respectively. The first of these frequencies is very close to the period of 0.0700 day listed in a catalogue of δ Scuti stars published in 2000. This is the first report of multiperiodicity in EQ Eri. None of the period ratios fall within the range of 0.74-0.78 expected for the ratio of the first overtone to the fundamental mode of δ Scuti stars pulsating in the radial mode.
机译:在2013年11月2日至12月8日的六个晚上对δScuti星EQ Eridani星(HD 28665)进行了DSLR光度测定。比较星和校验星分别为HD 28508和HD 28901。检查光曲线发现不规则的图案和振幅变化,表明存在两个或更多个周期。使用软件period04进行的傅立叶分析得出每天至少有3个脉动频率分别为14.3663、11.6862和7.2128个周期,分别对应于0.0696、0.0856和0.1386天。这些频率中的第一个非常接近2000年出版的δScuti星目录中列出的0.0700天的周期。这是EQ Eri中多周期的第一个报告。对于第一个泛音与以径向模式脉动的δScuti星的基本模式之比,预期的周期比均不在0.74-0.78的范围内。

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