There are two populations, or groups, of stars that make up the galaxy: Population I (newer, heavier) and Population II (older, lighter). Learn the distinct compositions and cosmic behavior of these two populations, including how they form. ...
4.According to paragraph 2, Population I stars and Population II stars differ from each other in terms of both A. how old they are and where in their galaxies they are found B. how old they are and whether they have a halo around them C. where in their galaxies they are found ...
The age difference between the oldest Population I stars and the extreme Population II stars is investigated by comparison of observational H-R diagrams with theoretical results using the common input physics and computer program for both Populations. Chemical compositions adopted for Population I and ...
4.According to paragraph 2, Population I stars and Population II stars differ from each other in terms of both how old they are and where in their galaxies they are found how old they are and whether they have a halo around them where in their galaxies they are found and whether they...
stars as discovered by Baade in 1944.Population II starsare the old metal poor stars that form the halo of the galaxy.Globular clustersare population II objects.Population I starsare younger and more metal rich. They form the disk of the galaxy. The sun is an intermediate age population I ...
网络释义 1. 第二类星族 我们现在看到的最古老的恒星,称为第二类星族(Population II stars) ,应该是稍微晚一点才形成的第二代恒星。和类似太阳的 … tw.knowledge.yahoo.com|基于2个网页
Stochastic Leslie matrix population projection model for the brush turkey (Alectura lathami) birdsaustraliaavespopulation-projectionspopulation-modelleslie-matrixbrush-turkeyalectura-lathami UpdatedJun 12, 2023 R Baker, Swanson, Tayman, and Tedrow's Cohort Change Ratio Files ...
On the basis of our age estimations of Population I pulsating stars in our Galaxy (Tsvetkov, 1986a), the mean ages of 6 open star clusters containing 21 Delta Scuti-variables and of 8 star clusters and associations containing 13 classical cepheids, have been evaluated. These mean cluster age...
E Pfahl,S Rappaport,AP Podsiadlowski - 《Astrophysical Journal Letters》 被引量: 74发表: 2002年 Population synthesis of double neutron stars Using the StarTrack binary population synthesis code we model the population of double neutron stars in the Galaxy. We include a detailed treatment of the...
I. Type II Cepheids. STARS: POPULATION IISTARS: EVOLUTIONSTARS: OSCILLATIONSII CEPHEIDSPulsating convective models and evolutionary tracks are used to constrain mass, luminosity, ... G Bono,F Caputo,P Santolamazza - 《Astronomical Journal》 被引量: 98发表: 1997年 EVOLUTION OF THERMALLY PULSING ...