本文關(guān)鍵詞：臨界轉(zhuǎn)動恒星Achernar的斜壓結(jié)構(gòu)與引力昏暗的精細研究　出處：《物理學(xué)報》2016年04期 　論文類型：期刊論文

  更多相關(guān)文章： 轉(zhuǎn)動 潮汐 斜壓結(jié)構(gòu) 引力昏暗

【摘要】：轉(zhuǎn)動和潮汐效應(yīng)是影響恒星結(jié)構(gòu)和演化的非常重要的物理因素.根據(jù)對Achernar的觀測數(shù)據(jù),用擾動理論推導(dǎo)了臨界轉(zhuǎn)動恒星Achernar分別作為單星和雙星的斜壓結(jié)構(gòu)的特征,給出Achernar等壓面上的密度等物理量的分布.利用考慮轉(zhuǎn)動和潮汐及形變效應(yīng)的單、雙星模型研究了Achernar的引力昏暗現(xiàn)象.結(jié)果表明正剪切增強離心力、減小赤道的重力加速度和溫度,反剪切結(jié)果則與之相反.反剪切和剛性轉(zhuǎn)動情況并不符合對Achernar的引力昏暗觀測結(jié)果.發(fā)現(xiàn)轉(zhuǎn)動雙星模型比單星模型雖更符合Achernar赤道和極半徑之比的觀測值,但理論計算的角速度比觀測值小.對比理論計算和觀測結(jié)果發(fā)現(xiàn),當(dāng)Achernar的自轉(zhuǎn)角速度為4 65 10~(-5)s~(-1),正剪切率?/?_s為0.7851時,Achernar的極點溫度為16041 K,赤道溫度為12073 K.所有理論計算與觀測值的相對誤差不超過7%.
[Abstract]:The rotation and tidal effect is very important physical factors affecting the stellar structure and evolution. According to the observation data of Achernar, deduced by perturbation theory of critical rotating stars Achernar respectively as the characteristics of the baroclinic structure of single and binary star of the distribution of the density of the physical quantities of Achernar are given. With the consideration of the isobaric surface and rotation the tide and deformation effect of single and binary Achernar model to study the phenomenon of gravity darkening. The results showed that the positive shear enhanced centrifugal force, reduce the equatorial acceleration of gravity and temperature, anti shear results on the contrary. The anti shear and rigid rotation does not fit on the Achernar gravity darkening observations. Rotation model is better than single star the star model is more in line with the Achernar equatorial and polar radius ratio of the observed values, but the angular velocity calculation than the observations. The comparison between theoretical calculation and observation results showed that when Ache The rotation speed of rnar is 465 10~ (-5) s~ (-1), and the positive shear rate / _s is 0.7851. The extreme temperature of Achernar is 16041 K, and the equator temperature is 12073 K.. The relative error between all theoretical calculations and observations is not more than 7%..

【作者單位】： 貴州大學(xué)理學(xué)院物理系;中國科學(xué)院天體結(jié)構(gòu)與演化重點實驗室;中國科學(xué)院國家天文臺-貴州大學(xué)天文聯(lián)合研究中心;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:11463002) 中國科學(xué)院天體結(jié)構(gòu)與演化重點實驗室開放課題(批準(zhǔn)號:OP201405) 貴州大學(xué)研究生創(chuàng)新基金(批準(zhǔn)號:研理工2015055)資助的課題~~
【分類號】：P152
【正文快照】： 1引言近年來,很多研究者逐漸認識到轉(zhuǎn)動效應(yīng)是影響恒星結(jié)構(gòu)和演化的非常重要的物理因素[1 10]1924年,von Zeipel[11]假設(shè)當(dāng)恒星以角速度轉(zhuǎn)動并且處于輻射平衡時,發(fā)現(xiàn)恒星表面的輻射流與有效重力加速度eff成正比,=()eff4π()即von Zeipel原理.這表明輻射流將隨重力加速度的增大，

本文編號：1357456