天文基础知识 - 版本历史

Shen：/* 特殊恒星 */

2014-12-13T08:50:44Z

特殊恒星

←上一版本		2014年12月13日 (六) 08:50的版本
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	*[[BHB stars]]		*[[BHB stars]]

			*[[Be star]]

Shen：/* 星震学 */

2014-12-13T03:15:02Z

星震学

←上一版本		2014年12月13日 (六) 03:15的版本
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	*Asteroseismology (from Greek ἀστήρ, astēr, "star"; σεισμός, seismos, "earthquake"; and -λογία, -logia) also known as stellar seismology[1][2] is the science that studies the internal structure of pulsating stars by the interpretation of their frequency spectra.		*Asteroseismology (from Greek ἀστήρ, astēr, "star"; σεισμός, seismos, "earthquake"; and -λογία, -logia) also known as stellar seismology[1][2] is the science that studies the internal structure of pulsating stars by the interpretation of their frequency spectra.

	*可以精确测量log(g)		*可以精确测量log(g),参考[http://arxiv.org/abs/1411.0235]

	===特殊恒星===		===特殊恒星===

2014年12月13日 (六) 03:12 Shen

2014-12-13T03:12:01Z

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	==~~赫罗图~~==		==恒星==

			===赫罗图===
	*基于HST对球状星团 Omega Centauri(半人马座）的观测构建HR图。amazing movie [http://www.spacetelescope.org/videos/heic1017b/]		*基于HST对球状星团 Omega Centauri(半人马座）的观测构建HR图。amazing movie [http://www.spacetelescope.org/videos/heic1017b/]

			===星震学===
			*Asteroseismology (from Greek ἀστήρ, astēr, "star"; σεισμός, seismos, "earthquake"; and -λογία, -logia) also known as stellar seismology[1][2] is the science that studies the internal structure of pulsating stars by the interpretation of their frequency spectra.

			*可以精确测量log(g)

	==特殊恒星==		===特殊恒星===
	*参考[http://www.astrogeo.va.it/astronom/spettri/apen.htm]		*参考[http://www.astrogeo.va.it/astronom/spettri/apen.htm]

2014年12月13日 (六) 01:17 Shen

2014-12-13T01:17:05Z

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	==赫罗图==		==赫罗图==
	*amazing movie [http://www.spacetelescope.org/videos/heic1017b/]		*基于HST对球状星团 Omega Centauri(半人马座）的观测构建HR图。amazing movie [http://www.spacetelescope.org/videos/heic1017b/]

2014年12月9日 (二) 08:44 Shen

2014-12-09T08:44:07Z

←上一版本		2014年12月9日 (二) 08:44的版本
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			==赫罗图==
			*amazing movie [http://www.spacetelescope.org/videos/heic1017b/]


	==特殊恒星==		==特殊恒星==
	*参考[http://www.astrogeo.va.it/astronom/spettri/apen.htm]		*参考[http://www.astrogeo.va.it/astronom/spettri/apen.htm]

2014年11月21日 (五) 08:49 Shen

2014-11-21T08:49:28Z

←上一版本		2014年11月21日 (五) 08:49的版本
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	*[[magnetic A stars]] （Ap)		*[[magnetic A stars]] （Ap)

			*[[BHB stars]]

Shen：/* 特殊恒星 */

2014-11-21T04:07:58Z

特殊恒星

←上一版本		2014年11月21日 (五) 04:07的版本
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	==特殊恒星==		==特殊恒星==
	*[http://www.astrogeo.va.it/astronom/spettri/apen.htm]		*参考[http://www.astrogeo.va.it/astronom/spettri/apen.htm]

	*[[Metallic A stars]] (Am)		*[[Metallic A stars]] (Am)

Shen：/* 特殊恒星 */

2014-11-21T04:07:29Z

特殊恒星

←上一版本		2014年11月21日 (五) 04:07的版本
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	==特殊恒星==		==特殊恒星==
			*[http://www.astrogeo.va.it/astronom/spettri/apen.htm]

	*[[Metallic A stars]] (Am)		*[[Metallic A stars]] (Am)

Shen：以“==特殊恒星== Metallic A stars (Am) magnetic A stars （Ap)”替换内容

2014-11-21T04:06:43Z

以“==特殊恒星== *Metallic A stars (Am) *magnetic A stars （Ap)”替换内容

←上一版本		2014年11月21日 (五) 04:06的版本
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			==特殊恒星==
⚫	*Metallic A stars (Am)

		⚫	*[[Metallic A stars]] (Am)
	Among the A class, the 25% of stars show some oddities. Among all these peculiar stars the most important classes are the metallic A stars (Am)and the [[magnetic A stars]] (Ap).

			*[[magnetic A stars]] （Ap)
	Am stars, due to the strong intensity of their metallic lines were first classified in the F class and they were shifted to the A class only after the discovery that their black-body temperature was in the range of the temperatures of A stars.
	Among the elements that can be found in the atmosphere of these stars with abundancies up to 25 times the average we can find Stronzium,Yttrium, Barium, Zirconium, Zinc and Copper. On the contrary, sole light elements are under abundant, like Calcium and Scandium.

	The real physical processes involved in such an odd spectrum were first understood around 1970 when it become clear that Am stars are all unusually slow rotators and that they belong to binary systems where the original fast rotation was slowed down by tidal forces until star rotation was locked with orbital period.

	Without a fast rotation and without convection that is typical only of colder stars, the atmospheres of these stars are extremely quiet and superficial segregation phenomena can arise where the chemical composition is very different from that of deeper layers, producing peculiar absorption spectra.

2014年11月21日 (五) 04:04 Shen

2014-11-21T04:04:45Z

←上一版本		2014年11月21日 (五) 04:04的版本
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			*Metallic A stars (Am)
⚫	*Metallic A stars (Am) Among the A class, the 25% of stars show some oddities. Among all these peculiar stars the most important classes are the metallic A stars (Am)and the magnetic A stars (Ap).
⚫	Am stars, due to the strong intensity of their metallic lines were first classified in the F class and they were shifted to the A class ~~onlyafter~~ the discovery that their black-body temperature was in the range of the temperatures of A stars.
⚫	Among the elements that can be found in the atmosphere of these stars with abundancies up to 25 times the average we can find Stronzium,Yttrium, Barium, Zirconium, Zinc and Copper. On the contrary, sole light elements are ~~underabundant~~, like Calcium and Scandium.

		⚫	Among the A class, the 25% of stars show some oddities. Among all these peculiar stars the most important classes are the metallic A stars (Am)and the [[magnetic A stars]] (Ap).

		⚫	Am stars, due to the strong intensity of their metallic lines were first classified in the F class and they were shifted to the A class only after the discovery that their black-body temperature was in the range of the temperatures of A stars.
⚫	The real physical processes involved in such an odd spectrum were first understood around 1970 when it become clear that Am ~~starsare~~ all unusually slow rotators and that they belong to binary systems where the original fast rotation was slowed down by tidal ~~forcesuntil~~ star rotation was locked with orbital period.
		⚫	Among the elements that can be found in the atmosphere of these stars with abundancies up to 25 times the average we can find Stronzium,Yttrium, Barium, Zirconium, Zinc and Copper. On the contrary, sole light elements are under abundant, like Calcium and Scandium.
⚫	Without a fast rotation and without convection that is typical only of colder stars, the atmospheres of these stars are extremely ~~quietand~~ superficial segregation phenomena can arise where the chemical composition is very different from that of deeper layers, ~~producingpeculiar~~ absorption spectra.

		⚫	The real physical processes involved in such an odd spectrum were first understood around 1970 when it become clear that Am stars are all unusually slow rotators and that they belong to binary systems where the original fast rotation was slowed down by tidal forces until star rotation was locked with orbital period.

		⚫	Without a fast rotation and without convection that is typical only of colder stars, the atmospheres of these stars are extremely quiet and superficial segregation phenomena can arise where the chemical composition is very different from that of deeper layers, producing peculiar absorption spectra.

天文基础知识 - 版本历史

Shen：​/* 特殊恒星 */

Shen：​/* 星震学 */

2014年12月13日 (六) 03:12 Shen

2014年12月13日 (六) 01:17 Shen

2014年12月9日 (二) 08:44 Shen

2014年11月21日 (五) 08:49 Shen

Shen：​/* 特殊恒星 */

Shen：​/* 特殊恒星 */

Shen：​以“==特殊恒星== *Metallic A stars (Am) *magnetic A stars （Ap)”替换内容

2014年11月21日 (五) 04:04 Shen

Shen：/* 特殊恒星 */

Shen：/* 星震学 */

Shen：/* 特殊恒星 */

Shen：/* 特殊恒星 */

Shen：以“==特殊恒星== Metallic A stars (Am) magnetic A stars （Ap)”替换内容