高振幅的δScuti变星的周期变化分析

发布时间：2018-06-16 20:42

本文选题：O-C方法 + δScuti型脉动变星　；参考：《西华师范大学》2016年硕士论文

【摘要】：对四颗高振幅的δScuti型脉动变星GSC 4464-0924、V524 And、AD CMi、CY Aqr的O-C图像进行了分析。得到GSC 4464-0924的周期是增大的,它的周期变化率dP/dE为123.10 10 days/cycle-?。V524 And的周期是在减小的,它的周期变化率dP/dE为122.45 10--?days/cycle。对AD CMi和CY Aqr两颗星进行周期分析的时候发现它们的O-C的图形并不是呈现单纯的抛物线的形式,因此我们对这两颗的周期变化进行了进一步的分析。首先利用离散的傅里叶变换的方法对它们的谐频进行分析,然后用Kopal[1]的方法得到可能存在的伴星的轨道参数。我们得到的结论是AD CMi可能存在着一颗伴星,而这颗伴星的轨道参数为:轨道周期P26.36years??,离心率e??0.8542,同时我们计算了当轨道倾角i?=30?-90?时伴星的质量m??1.0228 M⊙-2.6595 M⊙。而CY Aqr可能不仅仅存在着一颗伴星,很可能存在着两颗伴星,第一颗伴星的轨道参数为:轨道周期为P??54.2years,离心率为e??0.49。当1i?=30?-90?时计算得出伴星的质量1m?0.09 M⊙-0.04 M⊙。第二颗伴星的轨道参数为:轨道周期为P??47.3years,轨道倾角为e??0.69。当2i?=30?-90?时计算得出伴星的质量2m?0.05 M⊙-0.02 M⊙。因此CY Aqr极有可能为一个三星系统。
[Abstract]:The O-C images of four high amplitude 未 Scuti pulsating variable stars GSC4464-0924 V524 and AD CMiCY Aqr are analyzed. It is obtained that the period of GSC4464-0924 is increased, and the period of DP / dE = 123.10 10 days / r cycle.V524 And is decreased, and the rate of periodic variation dp / dE is 122.45 10-daysr-cycle. In the periodic analysis of AD CMI and CY Aqr stars, it is found that their O-C patterns do not represent a simple parabola, so we further analyze the periodic variations of these two stars. Their harmonic frequencies are analyzed by means of discrete Fourier transform, and then the orbital parameters of possible companion stars are obtained by Kopal [1] method. Our conclusion is that there may be a companion star in AD CMi, and the orbital parameters of the companion star are: orbital period P26.36 years1, eccentricity = 0.8542. The mass of the time companion star is 1.0228M} -2.6595M _ (-) _ _ _. However, CY Aqr probably has not only one companion star, but also two companion stars. The orbital parameters of the first companion star are: the orbit period is 54.2 years, and the centrifugal rate is 0.49. When 1ijiao 30-90? The mass of the companion star 1m?0.09 M is obtained by time calculation. The orbital parameters of the second companion star are as follows: the orbital period is 47.3 years, and the orbit inclination is 0.69. When the 2ijiao 30-90? The mass of the companion star 2m?0.05 M is obtained by time calculation. So CY Aqr is likely to be a Samsung system.
【学位授予单位】：西华师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P145.2

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