…There is a considerable amount of interstellar absorption even in globular clusters, especially those close to the center of the galaxy. In 1930, RJ Trumpler revealed the fact of absorption, and in 1936, J. Stebbins and AE Whitford applied this to determining the distances of globular clusters, resulting in a significant revision of the size of the galaxy to 160,000 x 130,000 x 110,000 light years, and the distance of the sun from the center of the galaxy to 33,000 light years. There has also been much discussion about the absolute magnitude of the RR Lyrae type variable stars used to determine the distances of globular clusters, and in the early days, a value of 0.0 magnitude (photographic absolute magnitude) was adopted, but as of the early 1980s, a value of 0.6 magnitude (visual absolute magnitude) has become the standard value. … *Some of the terminology references "Whitford, AE" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…球状星団でも,とくに銀河系中心に近い方向にあるものについては,かなりの星間吸収が存在するのである。30年,トランプラーR.J.Trumplerが吸収の事実を明らかにし,ステビンズJ.StebbinsとウィットフォードA.E.Whitfordが36年にこれを球状星団の距離決定にも適用した結果,銀河系の大きさは16万光年×13万光年×11万光年に,また太陽の銀河系中心からの距離は3.3万光年と大幅に修正された。なお球状星団の距離決定に使われること座RR星型変光星の絶対等級の値についても,諸種の議論があり,初期のころは0.0等(写真絶対等級)という値が採用されていたのが,80年代初期現在では,0.6等(実視絶対等級)という値が標準値とされている。… ※「Whitford,A.E.」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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