Gyrochronology paper

  • #1
jim mcnamara
Mentor
4,222
2,787
Meibom, Søren; Barnes, Sydney A.; Platais, Imants; Gilliland, Ronald L.; Latham, David W.; Mathieu, Robert D. (5 January 2015). "A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster". Nature. doi:http://dx.doi.org/10.1038%2Fnature14118 [Broken].

The rotational velocity of a G-type or smaller star apparently indicates the age of the star. Good tool, assuming this observation holds generally. For example, if you wanted to find a star system like ours, then look for G-type stars with a period of rotation similar to the sun: 26 days.

Since this not my area, can someone point out where the lost angular momentum goes over time. The early Earth's day length was considerably shorter than it is today. The Earth-moon system has transferred angular momentum to the moon over time. Correct? So stars in the study slowed rotation is a similar way? Does this imply planets?
 
Last edited by a moderator:

Answers and Replies

  • #2
Chronos
Science Advisor
Gold Member
11,408
742
There are a variety of ways a star can shed rotational velocity, including magnetic braking and interaction with a companion or planetary system. For discussion see http://astro.uwo.ca/~dfgray/Rotation.html.
 
  • Like
Likes jim mcnamara
  • #3
jim mcnamara
Mentor
4,222
2,787
Great help - thank you.
 

Related Threads on Gyrochronology paper

  • Last Post
Replies
3
Views
4K
  • Last Post
2
Replies
25
Views
4K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
11
Views
2K
  • Last Post
Replies
7
Views
3K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
2K
Top