用三次多项式逼近RR Lyrics光变曲线
Approximating RR Lyrae light curves using cubic polynomials
摘要:
本文用三次多项式逼近天琴座RR型星的光变曲线,并将此方法应用于M31晕中天琴座RR型星的HST数据。我们比较我们的方法傅立叶分解的标准方法,并发现,三次多项式的方法几乎消除了所有的振铃效应,这样做的参数比傅立叶技术少得多。此外,对于RRc星,拟合中的参数都是物理的。我们的研究还揭示了一些以前没有发现的额外的周期岩:我们发现了23颗RRc星,29颗RRab星和3颗多周期星。
英文摘要:
In this paper, we use cubic polynomials to approximate RR Lyrae light curves and apply the method to HST data of RR Lyraes in the halo of M31. We compare our method to the standard method of Fourier decomposition and find that the method of cubic polynomials eliminates virtually all ringing effects and does so with significantly fewer parameters than the Fourier technique. Further, for RRc stars the parameters in the fit are all physical. Our study also reveals a number of additional periodicites in this data not found previously: we find 23 RRc stars, 29 RRab stars and 3 multiperiodic stars.
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