Young, metal-heavy stars like the sun are Population I stars; the older the star, the higher the population number. Population I and II stars occupy different parts of the spiral galaxies and have different properties. Stars observed in galaxies were originally divided into two populations by Walter Baade in the 1940s. Another naming convention, drawing upon a star's metal content, lists stars as belonging to Population I, Population II and so on. The rougly spherical region of faint old stars and globular clusters in which the rest of the galaxy is embedded is called the galactic _____. When astronomers classify stars, they normally lump them into three categories, creatively named Population I, II, and III stars. ... How are population II stars different than the Sun? This population is concentrated very close to the disk plane, with a scale height of ~100 pc. The star Schlaufman and his … They include the Sun and are hot and young stars. Population I stars include the sun and tend to be luminous, hot and young, concentrated in the disks of … The metallicity of this population is somewhat higher than that of the Sun (MB81). Many Population III stars were probably more massive than even the Pistol Star, which may have already ejected half of its initial 200 Solar-masses since its birth as much as three million years ago. Stars less than 100 million years old are found in the spiral arms within 400 light years of the disk plane. The rotational velocity of a star near the Galaxy's outer edge and the distance to that star. Halo : The Population II stars in our galaxy are located : The daily motion of the stars in our sky is a consequence of the earth's _____. Which of the following are problems facing the traditional hypothesis of the formation of the Milky Way? … They have circular orbits and metal abundances of 1 to 2.5 times solar abundance. Classical Cepheids are Population I (metal-rich) variable stars that are 4-20 times more massive than the Sun and up to 100,000 times more luminous. Population II stars are lower in metals than population I stars. The young stars have metal abundances of 1 to 2 times the Sun's abundance and stay within 650 light years of the disk plane. The oldest population II star discovered to date has less than one ten-millionth as much iron as the Sun, for example. Representative objects include H I and molecular clouds, H II regions, protostars, stars of types O & B, supergiants and classical cepheids. Population II stars have lower metal abundances than the Sun. The formation of the Sun may have been triggered by shockwaves from one or more nearby supernovae. The best evidence for a distinct population of stars would be a lower cutoff in the metallicity distribution of Population II stars. Search. If the first stars had the same IMF as today, with a lower cutoff at about 0.1 M , one might expect stars smaller than 0.8 M (whose lifetime exceeds the age of the Universe) to display arbitrarily low metallicity. Early stars born in the range of 140 to 260 Solar-masses may … While astronomers have found 30 ancient ultra metal-poor stars in the past , each of them had the approximate mass of the Sun. Start studying Chapter 15.

Wikimedia Commons user … The Sun is a Population I, or heavy-element-rich, star.

These types are usually found in spiral galaxies. The Sun has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. How are population II stars different than the sun, a population I star? However, in the early Universe, almost all of the stars were O or B-class stars, with an average mass 25 times greater than average stars today.

Population I stars are stars like our Sun… Population 1 stars are luminous. Learn vocabulary, terms, and more with flashcards, games, and other study tools.