Emden, R.

Japanese: エムデン,R. - えむでん
Emden, R.

...A theory that seeks to clarify the temperature and density of matter deep inside a star, the reactions that occur there, and the properties of the star as a result. H. Lane and R. Emden were the first to quantitatively treat the internal structure of a star at the end of the 19th century and the beginning of the 20th century. They calculated the distribution of temperature and pressure inside a star, and showed that the star is so hot and high pressured that it does not collapse despite its own weight.

From [Polytrope]

...A star is a gas sphere with high temperature and pressure inside, and maintains a constant size by balancing its own gravity with the pressure of the internal gas. Research into the interior of such stars is called stellar internal structure theory, and was started in the early 20th century by R. Emden (1862-1940) and others. Emden assumed that the pressure p of the gas inside a star is proportional to a power of the density ρ, and investigated the equilibrium state and determined the distribution of the internal pressure, density, etc. ...

*Some of the terminology that mentions "Emden, R." is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…恒星の内部深くでは,物質がどのような温度や密度の状態にあり,そこでどのような反応が起こっており,その結果として,恒星はどのような性質を示すかを明らかにしようとする理論。恒星の内部構造を初めて定量的に取り扱ったのは,レーンH.LaneやエムデンR.Emdenで,19世紀の終りから20世紀初頭のことであった。彼らは恒星の内部における温度や圧力の分布を計算し,恒星が自分自身の重みにもかかわらず,つぶれてしまわないほどの高温,高圧になっていることを示した。…

【ポリトロープ】より

…恒星は内部が高温高圧のガス球で,自分自身が作る重力と内部のガスの圧力がつり合って一定の大きさを保っている。このような恒星の内部がどのようになっているかを調べる研究は,恒星内部構造論と呼ばれ,20世紀初めエムデンR.Emden(1862‐1940)らによって始められた。エムデンは,星の内部のガスについてその圧力pが密度ρのべき乗に比例すると仮定して,平衡状態を調べ,内部の圧力,密度などの分布を求めた。…

※「エムデン,R.」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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