Questions tagged [hr-diagram]

Use this tag for questions regarding the Hertzsprung-Russell diagram.

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1answer
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Estimating a star's radius, temperature, and luminosity based on its mass

(See updated figure and description below.) I've been trying to generate ballpark estimates for the radius, temperature and luminosity of stars in the main sequence based solely on their masses (...
6
votes
3answers
182 views

Is there a stellar database that indicates how long ago stars in our Galaxy formed?

There are several ways of determining the age of a star: its position in the HR diagram, the presence of a protoplanetary disk, it belonging to a cluster... When did the stars in our Galaxy form? Do ...
5
votes
1answer
72 views

Is a branch on HR diagram a line formed by stars in the same evolutionary phase, or the evolutionary track of an individual star?

Here is a HR diagram from Wikipedia, in the well-known form: Here is another one from the Stellar evolution article: I know that when stars leave the main sequence, they go to the giant branch ...
4
votes
1answer
259 views

The life course for a massive star from birth to death using the HR Diagram

Could you explain to me the life course for a massive star (30-40 solar masses) from birth to death using the HR Diagram (by showing key events in its life)?