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"사용자:Ta183ta/연습장"의 두 판 사이의 차이

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{{short description|Type of star larger than main-sequence but smaller than a giant}}
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준거성은 같은 분광형에서 일반적인 주계열성보다 밝지만 거성보다는 어두운 항성이다. '준거성' 단어는 항성의 진화단계 및 특정 광도분류에 모두 적용된다.
A '''subgiant''' is a [[star]] that is brighter than a normal [[main sequence|main-sequence]] star of the same [[stellar classification|spectral class]], but not as bright as [[giant star]]s. The term subgiant is applied both to a particular spectral [[luminosity class]] and to a stage in the [[stellar evolution|evolution of a star]].
 
==Yerkes여키즈 luminosity class광도분류 IV==
The'준거성' term용어는 subgiant1930년 was절대등급이 first+2.5에서 used+4 in사이에 1930있는 forG형 class G and early뜨거운 K stars분광형 with항성들에 [[absolute최초로 magnitude]]s between +2.5 and +4사용되었다. These were noted as being part of a continuum of stars between obvious main-sequence stars such as the [[Sun]] and obvious giant stars such as [[Aldebaran]], although less numerous than either the main sequence or the giant stars.<ref name=sandage>{{cite journal|doi=10.1086/378243|title=The Age of the Oldest Stars in the Local Galactic Disk from ''Hipparcos'' ''Parallaxes'' of G and K Subgiants|journal=Publications of the Astronomical Society of the Pacific|volume=115|issue=812|pages=1187–1206|year=2003|last1=Sandage|first1=Allan|last2=Lubin|first2=Lori M.|last3=Vandenberg|first3=Don A.|arxiv = astro-ph/0307128 |bibcode = 2003PASP..115.1187S |s2cid=7159325}}</ref>
 
The [[Yerkes spectral classification]] system is a two-dimensional scheme that uses a letter and number combination to denote that temperature of a star (e.g. A5 or M1) and a [[Roman numeral]] to indicate the luminosity relative to other stars of the same temperature. Luminosity-class-IV stars are the subgiants, located between main-sequence stars (luminosity class V) and [[red giant]]s (luminosity class III).