Stars: HR Diagram & Classification

In this model out activity (MEA), students sort the list of stars based on absolute brightness, size, and temperature. Students analyze the astronomical data displayed on the chart and draw their own data on a special chart called Hertzsprung - Russell Diagram (H - R Diagram). Using this table, they have to decide the correct classification of each star. Using their data analysis, students completing this MEA will be able to identify two stars to a professional client, pointing out which star is the main sequence star and which is the white dwarf, giant or superstar We will develop paper responses.

When a particular globular cluster star is drawn on the HR map, in most cases nearly all stars are on a relatively clear curve. This is different from the HR diagram of the star near the sun. It confuses stars with different age and origin. Crooked shapes of globular clusters are formed almost simultaneously and are a feature of a group of stars coming from the same material, only their initial mass is different. Because the position of each star in the HR map varies with age, you can measure the overall age of the star group using the curve shape of the globular cluster.

When stars near the sun are drawn on the HR chart, the distributions of various masses, age, and constellation stars are displayed. Many stars are relatively close to the slope curve, and as star heat gets bigger, it is called main sequence star. However, this map is usually in the late stage of evolution, including stars that are far from the main sequence curve. Since all stars of a globular cluster are at about the same distance as ours, their absolute size is about the same as their visual size. The main star of a globular cluster fell along a line considered equivalent to a similar star similar to the sun. The accuracy of this hypothesis is confirmed by comparing the size of neighboring short-term variables (such as RR Lyrae stars and Cepheid variable stars) with comparable data from the cluster.