Thesesmallstarsarelocatedon thelowerleftoftheH-Rdiagram andarecalledwhitedwarfs. (Hertzsprung-Russeldiagram, 简写为H-Rdiagram)是丹麦天文学家赫 茨普龙及由天文学家分别于 1911年和1913年各自独立。后来 的研究发现,这是研究恒星演化的 重要工具。
The Evolution of StarsHertzsprung–Russel (HR) diagramluminosityasymptotic giant branch (AGB)planetary nebula (PN)Wolf‐Rayet starssupernovaewhite dwarfsblack holesCNO cyclerapid and slow neutron captureWe present statistical properties of diffuse Lyα haloes (LAHs) around high-z star-forming galaxies ...
燃料用尽后恒星会坍缩,而这一次因为质量很大于是重力也很大,突然的收缩造成密度的急剧上升,它的核心会implode. 出现sudden burst of energybouncing the collapse back out也就是产生shockwave, 造成explode.此刻的恒星叫作type 2 supernova. Type 2 supernova 有两种走向 当恒星的质量在8-20个太阳的质量之间,core r...
Figure 1. Evolution of a Star Like the Sun on an H–R Diagram: Each stage in the star’s life is labeled. (a) The star evolves from the main sequence to be a red giant, decreasing in surface temperature and increasing in luminosity. (b) A helium flash occurs, leading to a readjus...
1.An introduction is given to a model of the structure and evolution of stars, their distribution in the Hertzsprung-Russel diagram, their formation and early evolution,the evolution from the main sequence for stars of different masses, the final stage of stellar evolution and the resulting white...
An introduction is given to a model of the structure and evolution of stars, their distribution in the Hertzsprung-Russel diagram, their formation and early evolution,the evolution from the main sequence for stars of different masses, the final stage of stellar evolution and the resulting white dw...
The study shows that the rotational velocity of these stars reaches a minimum at the same location in the H-R diagram. However, no tight relationship between X-ray luminosities and projected equatorial velocities was found among the sample stars. I suggest that these results could reflect the ...
We have already used the H–R diagram to follow the evolution of protostars up to the time they reach the main sequence. Now we’ll see what happens next. Once a star has reached the main-sequence stage of its life, it derives its energy almost entirely from the conversion of hydrogen...
Observations taken in the ultraviolet, optical, infrared and radio regions of the spectrum of numerous stars as well as theories concerning stellar winds and mass loss rates and their effects on evolutions of O-type stars are presented in this book. Specific topics include free-free emission in ...
STARS: WOLF-RAYETWe constructed diagnostic diagrams using emission line ratios and equivalent widths observed in several samples of HII galaxies. The diagrams are compared to predictions from new photoionization models for evolving starbursts. We find that HII galaxies from objective-prism surveys are ...