搜索结果: 1-15 共查到“知识库 恒星形成与演化”相关记录81条 . 查询时间(3.469 秒)
研究人员利用LAMOST数据发现富含ɑ元素“年轻”恒星的形成机制（图）
LAMOST数据 ɑ元素 “年轻”恒星 形成机制
2023/1/12
近期，北京大学博士研究生张萌、张华伟研究员、德国马普天文研究所向茂盛博士等使用红巨星样本的LAMOST光谱数据筛选出富含ɑ元素的“年轻”恒星，并对这些恒星的形成机制进行了深入分析和研究，结果表明这些富ɑ元素的“年轻”恒星可能起源于双星演化，这使得人们对此类特殊恒星的形成有了更进一步的认识。该成果发表在国际知名天文学术期刊《天体物理学报》（2021,ApJ,922,145）。
东濮凹陷石炭－二叠系煤系烃源岩的生烃演化时空差异性尚存在争议，烃源岩热演化生烃史的定量化研究仍有待进一步深入.利用热模拟实验和盆地模拟技术对烃源岩热演化生烃史进行了系统定量评价.煤系暗色泥岩、煤和碳质泥岩具有相似的生气模式，以Ro为0.5%、1.2%、2.2%、3.15%作为界限，将煤系烃源岩生气作用统一划分为5个阶段，其中主生气期门限Ro为2.2%，对应深度约为5500 m；东濮凹陷石炭－二叠系...
Anatomy of the Gem OB1 molecular cloud complex
Gem Molecular cloud Molecular gas Form Star formation
2014/12/9
I have conducted an extensive study of the Gem OB1 molecular cloud complex in order to determine the global morphology of the molecular gas and how the morphology is correlated with the distribution o...
We conducted an extensive multi-wavelength study of the nearest giant molecular cloud, L1641, with the goal of characterizing its stellar populations. At a distance of approximately 500 pc, L1641 prov...
Emission line diagnostics of magnetospheric accretion in young stellar objects
Line emission Stars Accretion Star formation Formation of the accretion flow Stars Magnetic layer
2014/12/9
This thesis seeks to explain the nature of line emission observed in young stellar objects, and to use the lines as diagnostics of the accretion process that is central to star formation. We maintain ...
基于星云的流体力学和磁流体动力学，用非线性方程的定性分析理论讨论了双星的形成。非线性相互作用和旋转取到非常关键的作用。此外，Lorenz模型可以由流体力学方程导出，模型中的双翼正好形成双星。而线性方程仅仅形成单星。
A Mid-Infrared Indicator for Total Infrared Luminosity and Star Formation Rate of Local and High-Redshift Galaxies
Indicator Total Infrared Luminosity High-Redshift Galaxies
2011/10/9
We present a new method to use 24 micron observations to estimate the total infrared luminosity, LIR, and the star formation rate of star-forming galaxies across the redshift range 0 < z < 3. This is ...
Dynamics of Cosmological Perturbations in Multi-Speed Inflation
Dynamics Cosmological Perturbations Multi-Speed Inflation
2011/10/18
We study a multi-field inflationary theory with separable Lagrangian, which has different speed of sound for each field. We find that the fields always coupled at perturbative level through gravitatio...
Measurement of cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight in Antarctica
Measurement cosmic-ray antiproton spectrum solar minimum long-duration balloon
2011/10/18
The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.17 to 3.5 GeV, based on 7886 antiprotons collected by the BESS-Polar II instrument during a long-duration flight over Ant...
We analyzed the distribution of the RC stars throughout Galactic bulge using 2MASS data. We mapped the position of the red clump in 1 sq.deg. size fields within the area |l|<=8.5deg and $3.5deg<=|b|<=...
Evidence for Inflow in High-Mass Star-Forming Clumps
Evidence for Inflow in High-Mass Star-Forming Clumps
2011/10/17
We analyze the HCO+ 3-2 and H13CO+ 3-2 line profiles of 27 high-mass star-forming regions to identify asymmetries that are suggestive of mass inflow. Three quantitative measures of line asymmetry are ...
The properties and polarization of the H2O and CH3OH maser environment of NGC7538-IRS1
Stars: formation - masers: water, methanol - polarization - magnetic fi elds - ISM: individual: NGC7538
2011/10/17
NGC7538 is a complex massive star-forming region. The region is composed of several radio continuum sources, one of which is IRS1, a high-mass protostar, from which a 0.3 pc molecular bipolar outflow ...
Galaxy evolution in groups and clusters: star formation rates, red sequence fractions, and the persistent bimodality
methods: statistical-galaxies: groups: general-galaxies: clusters:general-galaxies: haloes-galaxies: evolution-galaxies: star formation
2011/10/17
Using galaxy group/cluster catalogs created from the Sloan Digital Sky Survey Data Release 7, we examine in detail the specific star formation rate (SSFR) distribution of satellite galaxies and its de...
Stellar Evolution Constraints on the Triple-Alpha Reaction Rate
Stellar Evolution Constraints Triple-Alpha Reaction Rate
2011/10/19
We investigate the quantitative constraint on the triple-alpha reaction rate based on stellar evolution theory, motivated by the recent significant revision of the rate proposed by nuclear physics cal...