DA型脈動(dòng)變星的星震學(xué)研究
發(fā)布時(shí)間：2018-10-23 10:54
【摘要】：首先,本文對(duì)白矮星、脈動(dòng)白矮星做了簡(jiǎn)要介紹,對(duì)恒星振動(dòng)理論、白矮星星震學(xué)、白矮星演化程序及恒星振動(dòng)程序做了簡(jiǎn)要介紹。然后,以三顆DA型脈動(dòng)白矮星即G29-38,HS0507+0434B,和EC14012-1446為目標(biāo),分別做了星震學(xué)模型擬合并將結(jié)果與光譜結(jié)果進(jìn)行比對(duì)。最后,在未來(lái)工作中介紹了欲將星震學(xué)工作和光譜工作結(jié)合起來(lái),考慮擬合吸收線和連續(xù)譜的差別,希望獲得對(duì)DA型脈動(dòng)白矮星GD154的更可靠的擬合結(jié)果。2008年,Thompson等人根據(jù)不同球諧度的幾何效應(yīng)對(duì)光譜產(chǎn)生的臨邊昏暗效應(yīng)對(duì)G29-38認(rèn)證了11個(gè)脈動(dòng)模式的球諧度數(shù)值。我們用WDEC做網(wǎng)格模型,取碳、氦和氦、氫擴(kuò)散平衡輪廓,核中心20%核表面60%的線性碳豐度,擬合這11個(gè)振動(dòng)模式,最終獲得了最佳擬合模型。其中有效溫度和重力加速度和許Pr藝等人2014年的光譜結(jié)果相符和其他人的光譜結(jié)果有出入。2013年,北京師范大學(xué)付建寧等人公布了他們對(duì)HS0507+0434B的WET聯(lián)測(cè)結(jié)果。其中,6個(gè)等間隔三分裂的模式被認(rèn)證成為l=1。我們使用WDEC構(gòu)建網(wǎng)格模型,表面還是擴(kuò)散平衡的輪廓,中心核嘗試著線性擬合MESA生成的熱核燃燒的碳輪廓。擬合這6個(gè)模式,我們的最佳擬合模型結(jié)果和Fontaine等人2003年的光譜結(jié)果以及Koester等人2009年的光譜結(jié)果很接近,但是和Gianninas等人2011年的光譜結(jié)果相差較大。將Handler等人2008年認(rèn)證的獨(dú)立本征頻率和Provencal等人2012年認(rèn)證的獨(dú)立本征頻率合起來(lái)考慮,我們重新對(duì)EC14012-1446做了模式認(rèn)證。根據(jù)頻率分裂關(guān)系和等周期間隔關(guān)系,我們認(rèn)證了6個(gè)l=1,4個(gè)l=2,5個(gè)l=3,和10個(gè)l=1或2的模式。網(wǎng)格模型還是MESA的核加WDEC的殼,但是我們對(duì)MESA生成的白矮星質(zhì)量和WDEC所需的白矮星質(zhì)量做了匹配,并且在WDEC演化白矮星過(guò)程中考慮了元素?cái)U(kuò)散,并非直接取擴(kuò)散平衡輪廓。最終星震學(xué)結(jié)果稍大于光譜結(jié)果�？煽康哪Ｊ秸J(rèn)證工作和符合物理?xiàng)l件的白矮星模型是白矮星星震學(xué)的必要條件。將星震學(xué)工作和光譜工作結(jié)合起來(lái)研究白矮星是一種有效的可行的研究方法。
[Abstract]:Firstly, the white dwarf and pulsating white dwarf are briefly introduced, and the theory of star vibration, the seismology of white dwarf, the evolution program of white dwarf and the program of star vibration are introduced briefly. Then, three DA pulsating white dwarfs, namely G29-38, HS0507 0434B, and EC14012-1446 are taken as targets. Finally, in the future work, it is introduced that we want to combine the astroseismological work with the spectral work, and consider the difference between the fitting absorption line and the continuous spectrum. In 2008, Thompson et al verified the spherical harmonic values of 11 pulsating modes on G29-38 according to the near edge dimming effect of different spherical harmonics on the spectrum. Using WDEC as the grid model, the equilibrium profile of carbon, helium, helium and hydrogen diffusion is taken, and the 60% linear carbon abundance on the core surface of the nuclear center is obtained. The 11 vibration modes are fitted and the best fitting model is obtained. The effective temperature and acceleration of gravity agree with those of others in 2014. In 2013, Fu Jianning and others published their WET results on HS0507 0434B. Of these, six equal-spaced three-splitting patterns were authenticated as lc1. We use WDEC to construct a grid model, the surface is still the contour of diffusion equilibrium, and the central core is trying to fit the carbon profile of hot core combustion generated by MESA linearly. By fitting these six models, the results of our best fitting model are very close to those of Fontaine et al. 2003 and Koester et al. 2009, but they differ greatly from those of Gianninas et al in 2011. Considering the independent eigenfrequency certified by Handler et al in 2008 and the independent eigenfrequency certified by Provencal et al in 2012, we remodel EC14012-1446. According to the frequency splitting relation and the equal periodic interval relationship, we have authenticated the models of 6 lg1, 4 LU 2, 5 LU 3, and 10 LU 1 or 2. The mesh model is also the kernel of MESA and the shell of WDEC, but we match the mass of white dwarf produced by MESA with the mass of white dwarf required by WDEC, and consider element diffusion in the process of WDEC evolution, not take diffusion equilibrium profile directly. The final astroseismological results are slightly larger than the spectral results. Reliable model verification and white dwarf model are necessary conditions of white dwarf seismology. It is an effective and feasible method to study white dwarf star by combining astroseismology and spectral work.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院(云南天文臺(tái))
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：P145.2
本文編號(hào)：2289025
[Abstract]:Firstly, the white dwarf and pulsating white dwarf are briefly introduced, and the theory of star vibration, the seismology of white dwarf, the evolution program of white dwarf and the program of star vibration are introduced briefly. Then, three DA pulsating white dwarfs, namely G29-38, HS0507 0434B, and EC14012-1446 are taken as targets. Finally, in the future work, it is introduced that we want to combine the astroseismological work with the spectral work, and consider the difference between the fitting absorption line and the continuous spectrum. In 2008, Thompson et al verified the spherical harmonic values of 11 pulsating modes on G29-38 according to the near edge dimming effect of different spherical harmonics on the spectrum. Using WDEC as the grid model, the equilibrium profile of carbon, helium, helium and hydrogen diffusion is taken, and the 60% linear carbon abundance on the core surface of the nuclear center is obtained. The 11 vibration modes are fitted and the best fitting model is obtained. The effective temperature and acceleration of gravity agree with those of others in 2014. In 2013, Fu Jianning and others published their WET results on HS0507 0434B. Of these, six equal-spaced three-splitting patterns were authenticated as lc1. We use WDEC to construct a grid model, the surface is still the contour of diffusion equilibrium, and the central core is trying to fit the carbon profile of hot core combustion generated by MESA linearly. By fitting these six models, the results of our best fitting model are very close to those of Fontaine et al. 2003 and Koester et al. 2009, but they differ greatly from those of Gianninas et al in 2011. Considering the independent eigenfrequency certified by Handler et al in 2008 and the independent eigenfrequency certified by Provencal et al in 2012, we remodel EC14012-1446. According to the frequency splitting relation and the equal periodic interval relationship, we have authenticated the models of 6 lg1, 4 LU 2, 5 LU 3, and 10 LU 1 or 2. The mesh model is also the kernel of MESA and the shell of WDEC, but we match the mass of white dwarf produced by MESA with the mass of white dwarf required by WDEC, and consider element diffusion in the process of WDEC evolution, not take diffusion equilibrium profile directly. The final astroseismological results are slightly larger than the spectral results. Reliable model verification and white dwarf model are necessary conditions of white dwarf seismology. It is an effective and feasible method to study white dwarf star by combining astroseismology and spectral work.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院(云南天文臺(tái))
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：P145.2
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