Copyright

Young Stars & Stellar Associations Video

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: Nuclear Fusion & Star Formation

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
 Replay
Your next lesson will play in 10 seconds
  • 0:02 Association Rules and Fees
  • 0:41 What is an Association?
  • 1:45 T, R, & OB Associations
  • 3:12 Lesson Summary
Save Save Save

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Log in or Sign up

Timeline
Autoplay
Autoplay
Speed Speed
Lesson Transcript
Instructor: Artem Cheprasov
This lesson will describe the concept of a stellar association for you and how it differs from a star cluster. You'll also learn about the three general kinds of stellar associations: R associations, T associations, and OB associations.

Association Rules and Fees

I may never be able to buy an apartment as a result of this, but I'm just gonna say it: I generally dislike homeowner associations. Associations are the organizations that take a property owner's money for things that, often times, they don't even want or need, but it's supposedly for the good of the community.

You may own your own home, but you still have to follow the rules associations set and pay the fees they charge you. To me, that makes little sense most of the time since I can't do anything with my property unless someone else, someone who doesn't own it, approves of what I want to do with it. So, as I've grown older, I've moved away from any properties associated with, well, associations.

Stars also appear to dislike pesky associations, and move away from them with time as well.

What Is an Association?

In the world of astronomy, an association is a loose collection of stars (roughly 10 to 100) moving together through space but not bound to one another by gravity. This means that these stars do not move in a star cluster, a collection of relatively tightly-bound stars moving together through space and held together by way of gravitational attraction to one other.

In star clusters, the stars like one another and stick close by. Associations, however, are a bunch of young stars that simply haven't had the time to move far away from the gas clouds from which they formed.

It's not clear why some gas clouds give rise to a star cluster and others give birth to associations, however. What is known is that the vast majority of stars begin their life as part of an association. But maybe because they don't like their association's rules or fees or whatever, they move away from the association with time - within a few million years, that is.

T, R, & OB Associations

Not all associations are created equal, so I'm sure there are good homeowners associations I don't want to receive any letters about.

Not all stellar associations are the same either.

  • T Associations are large groups of T Tauri stars.
  • OB Associations are groups of very young stars consisting of spectral types O and B.
  • R Associations are groups of bright young stars of intermediate mass illuminating reflection nebulae.

To unlock this lesson you must be a Study.com Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use Study.com

Become a Study.com member and start learning now.
Become a Member  Back
What teachers are saying about Study.com
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create an account
Support