δScuti型变星脉动特性的研究

【作者】 徐岩；

【导师】 李治平； 夏晓阳；

【作者基本信息】 天津师范大学 ， 天体物理， 2003， 硕士

【摘要】 本文回顾了δ Scuti型变星的发现和研究的历史。介绍了δ Scuti型变星脉动不稳定带的蓝端最重要的激发机制，氢和氦的电离效应所导致的κ机制。介绍了对δ Scuti型变星观测性质和物理性质的统计研究，以及以频谱分析为基础的测光研究的方法和三种最重要的通过光谱研究做模式证认的方法。我们针对1997年STEPHI联测的数据和利用兴隆站85cm望远镜从2001到2002年观测得到的资料，得出δ Scuti型变星V647 Tau，SAO73233，SAO54473，V650 Tau，V461 Phe振幅谱，计算出变星的物理参数，研究它们的脉动特性。与进行过大量观测研究的变星做比较，物理参数相似的变星显示出频谱上的一致性。并根据对V650 Tau历年的观测资料，指出了它的振幅随时间变化的特点。最后本文比较了Pamyatnykh(2000) 得到的脉动不稳定带与Xiong&Deng(2001) 利用依赖于时间的非局域对流理论得到的脉动不稳定带。介绍了Xiong＆Deng(2001) 得到的理论的红边界。利用Rodriguez et al．(2000) 星表中的δ Scuti型变星的样本对观测和理论的红蓝边界做比较。并分析了导致相互间差别的可能原因。更多还原

【Abstract】 In present thesis, we briefly reviewed discovery and study progress of 6 Scuti variables. It is introduced about mechanism caused by ionization of H and He which is dominant excitation mechanism near blue edge of instability strip. Statistical study about observational and physical characters of 6 Scuti variables, photometric method based on Fourier analysis and three kinds of spectroscopic techniques approach to mode identification are reviewed.Analyzing data observed by STEPHI in 1997 and by us using 85cm’telescope of XingLong from 2001 to 2002, we obtained amplitude spectra of V647 Tau, SAO73233, SAO54473, V650 Tau, V461 Phe and calculated their physical parameters to study their pulsation peculiarity. Comparing with carefully studied variables, spectra of S Scuti stars having similar physical parameters show identity. According to observational results of past years, amplitude variability of V650 Tau is investigated.We compared Pamyatnykh’s pulsation strip (2000) and Xiong & Deng’s pulsation strip (2001) obtained by considering non-local time-dependent statistical theory of convection. Xiong & Deng’s theoretical red edge is introduced. Samples in catalogue (Rodriguez et al. 2000) are used to derive the observational blue and red edges to compare with the theoretical ones. Possible reasons causing difference between results of theory and observation are discussed.更多还原