本文選題：盾牌座δ型變星 + 星震學(xué)　； 參考：《中國科學(xué)院大學(xué)(中國科學(xué)院云南天文臺)》2017年博士論文

【摘要】：盾牌座δ型脈動變星上存在豐富的振動模式,既有徑向振動模式又有非徑向振動模式.不同的振動模式攜有恒星內(nèi)部不同的結(jié)構(gòu)信息,故盾牌座δ型變星是星震學(xué)理想的研究對象.本文中,我們對三顆盾牌座δ型變星HD 50844,CoRoT102749568,以及EE Cam進(jìn)行了星震學(xué)分析,并獲得了一些非常有意義的結(jié)果.HD 50844的脈動現(xiàn)象是在2005年被發(fā)現(xiàn)的.2014年,Balona分析CoRoT測光序列共獲得59個可靠的振動頻率.本文中,我們更關(guān)心頻率值大于75μHz的40個振動模式.從這40個振動頻率中,我們一共發(fā)現(xiàn)了13組可能的自轉(zhuǎn)分裂多重線.其中有2組完整的自轉(zhuǎn)分裂三重線,1組不完整的自轉(zhuǎn)分裂三重線,7組不完整的自轉(zhuǎn)分裂五重線,和3組不完整的自轉(zhuǎn)分裂七重線.根據(jù)這些自轉(zhuǎn)分裂值,我們計(jì)算得到HD 50844的自轉(zhuǎn)周期為2.44+0.13-0.08天.通過用模型計(jì)算頻率擬合三個m=0的非徑向振動模式f11,f22,和f29和一個徑向基頻模式f4,我們確定了HD 50844的基本參數(shù):M=1.81±0.01 M⊙,Z=0.008±0.001,Teff=7508±125 K,log g=3.658±0.004,R=3.300±0.023 R⊙,L=30.98±2.39L⊙.除此之外,我們發(fā)現(xiàn)大部分觀測頻率屬于混合模式.非徑向振動模式f11,f22,和f29在恒星包層有p模式的傳播特征,同時(shí)它們在恒星氦核兼有顯著的g模式特性.而徑向基頻模式f4主要在恒星包層內(nèi)傳播,攜帶的是恒星包層的結(jié)構(gòu)信息.這些特點(diǎn)要求理論模型的恒星包層和氦核都要與真實(shí)情況相匹配.最終我們得到了HD 50844的氦核大小MHe=0.173±0.004 M⊙和RHe=0.068±0.001R⊙.2013年,Papar¨o等人公布了他們對CoRoT 102749568的分析結(jié)果,共得到52個獨(dú)立的振動頻率.我們從中發(fā)現(xiàn)4組l=1模式的自轉(zhuǎn)分裂多重線,9組l=2模式的自轉(zhuǎn)分裂多重線,和8組l=3模式的自轉(zhuǎn)分裂多重線.尤其,這些自轉(zhuǎn)分裂多重線中有三組完整的三重線,他們分別是(f10,f12,f14),(f31,f34,f35),和(f41,f43,f44).根據(jù)這些自轉(zhuǎn)分裂值,我們確定了CoRoT 102749568的自轉(zhuǎn)周期Prot=1.34+0.04-0.05天.模型擬合結(jié)果表明CoRoT 102749568是一顆主序后恒星,其基本參數(shù)為:M=1.54±0.03 M⊙,Z=0.006,fov=0.004±0.002,log g=3.696±0.003,Teff=6886±70 K,R=2.916±0.039 R⊙,and L=17.12±1.13L⊙.與HD 50844類似,CoRoT 102749568的大部分觀測頻率也屬于混合模式.基于非徑向振動模式(f12,f34,f43)及徑向模式f13的振動特征,我們得到了CoRoT102749568的氦核大小MHe=0.148±0.003 M⊙和RHe=0.0581±0.0007 R⊙.EE Cam的脈動現(xiàn)象是在1997年被發(fā)現(xiàn)的.Breger等人自2006年到2010年對其進(jìn)行了測光觀測,獲得了300+晚上的測光數(shù)據(jù).從這300+晚上的測光數(shù)據(jù)中,Breger等人共提取了37個獨(dú)立的振動頻率.我們從中發(fā)現(xiàn)5組l=1模式的自轉(zhuǎn)分裂,10組l=2模式的自轉(zhuǎn)分裂.僅僅用l=0,1,2模式就可以解釋EE Cam的頻率譜,這和HD 50844和CoRoT 102749568有很大的不同.基于這些自轉(zhuǎn)分裂,我們計(jì)算得到了EE Cam的自轉(zhuǎn)周期為Prot=1.84+0.07-0.05天.通過用計(jì)算頻率與觀測頻率進(jìn)行擬合匹配,我們找到了一個最佳匹配的恒星模型,其物理參數(shù)為:M=2.04 M⊙,Z=0.028,Teff=6433 K,log L/L⊙=1.416,R=4.120 R⊙,log g=3.518.基于最佳擬合模型,我們發(fā)現(xiàn)非徑向振動模式f11和f32屬于混合模式,它們在恒星包層有p模式的傳播特征,同時(shí)它們在恒星氦核兼有顯著地g模式特征.而徑向基頻模式f1主要在恒星包層內(nèi)傳播,它攜帶的是恒星包層的結(jié)構(gòu)信息.最后,我們得到了EE Cam的氦核大小MHe=0.181 M⊙和RHe=0.0796 R⊙.
[Abstract]:There are abundant vibration modes on the delta type pulsating variable star of the shield, which have both radial vibration mode and non radial vibration mode. Different vibration modes carry different structural information inside the star, so the shield delta variable star is the object of the study of the ideal of the star seismology. In this paper, we have three delta variable stars HD 50844, CoRoT102749568, And EE Cam carried out the analysis of the star seismology, and obtained some very meaningful results of the pulsation of.HD 50844, which was found in 2005. The Balona analysis CoRoT photometric sequence obtained a total of 59 reliable vibration frequencies. In this paper, we are more concerned with the 40 vibration modes of the frequency value greater than 75 mu Hz. From these 40 vibrational frequencies, we are concerned. A total of 13 groups of possible spontaneous mitotic multiple lines were found. There were 2 groups of complete rotation split three lines, 1 incomplete rotation split three lines, 7 incomplete rotation split five lines, and 3 groups of incomplete rotation splitting seven lines. According to these rotation splitting values, the rotation period of HD 50844 was calculated to be 2.44+0.13-0.08 By using the model to calculate the non radial vibration modes of three m=0, F11, F22, and f29 and a radial fundamental frequency mode F4, we determine the basic parameters of HD 50844: M=1.81 + 0.01 M, Z=0.008 + 0.001, Teff=7508 + 125 K, log 0.004, + 0.023. The frequency of the measurement is a mixed mode. The non radial vibration modes F11, F22, and f29 have the propagation characteristics of the P mode in the stellar cladding, and they have a significant G mode characteristic in the helium nucleus of the star. The radial fundamental frequency mode F4 is mainly propagating in the stellar cladding and carrying the structural information of the stellar cladding. These characteristics require the stellar cladding of the theoretical model. And the helium core should be matched with the true condition. Finally, we got the HD 50844 helium core size MHe=0.173 + 0.004 M and RHe=0.068 + 0.001R.2013 years. Papar & O and others published their analysis results to CoRoT 102749568. We got 52 independent vibrational frequencies. We present 4 groups of l=1 modes of the split multiple lines, 9 l=2. The split multiple lines of the mode, and the 8 groups of l=3 modes of the split multiple lines. In particular, there are three sets of complete three lines in these split multiple lines, they are (F10, F12, F14), (f31, F34, F35), and (F41, F43, f44). According to these rotation splitting values, we determine the rotation of CoRoT 102749568 for the cycle of Prot=1.34+0.04-0.05 days. The fitting results show that CoRoT 102749568 is a star after main sequence, and its basic parameters are M=1.54 + 0.03 M, Z=0.006, fov=0.004 + 0.002, log g=3.696 + 0.003, Teff=6886 + 70 K, R=2.916 + 0.039 R. Similar to 50844, the large part of the observed frequency of 102749568 is based on the non radial vibration. The vibration characteristics of the mode (F12, F34, F43) and radial mode f13, we have obtained the pulsation phenomenon of the CoRoT102749568 helium size MHe=0.148 + 0.003 M and RHe=0.0581 + 0.0007 R.EE Cam, which were found in 1997 from 2006 to 2010. In the evening photometry data, Breger and others extracted 37 independent vibrational frequencies. We found 5 groups of l=1 mode rotation splitting and 10 groups of l=2 mode spin splitting. The frequency spectrum of EE Cam can be explained by only l=0,1,2 mode, which is very different from HD 50844 and CoRoT 102749568. Based on these spin splitting, we calculate The rotation period of EE Cam is Prot=1.84+0.07-0.05 days. By fitting the calculated frequency with the observed frequency, we find a best matching star model. The physical parameters are M=2.04 M, Z=0.028, Teff=6433 K, log L/L, =1.416, and based on the best fitting model, we find non radial. The vibration modes F11 and F32 belong to the mixed mode, which have the propagation characteristics of the P pattern in the stellar cladding, and they have a significant g pattern in the helium nucleus of the star. And the radial fundamental frequency mode F1 is propagating mainly in the stellar cladding, which carries the structural information of the stellar cladding. Finally, we get the EE Cam's helium core size MHe=0.181 M M And RHe=0.0796 R.

【學(xué)位授予單位】：中國科學(xué)院大學(xué)(中國科學(xué)院云南天文臺)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：P15

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