Rotational evolution of TTS using two polytropes

Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

Low mass stars as the Sun, have had during their first million years of life a large interaction with the accretion disk resulting in the star formation. This interaction which consists in a magnetic connection between the central star and the disk results in an important braking of the star rotation. Later, the disk is disintegrated and a spin up process appears. Much later, magnetic winds will again produce a spin down which will result in the more or less slow Main Sequence (MS) rotations. Despite the tremendous increase of measured periods of rotation in Pre Main Sequence Stars (PMS) during these recent years and theoretical advances, the physics at the end of the disk lifetime remains obscure. We are tackling this problem by considering first, which will be the response of the star rotation when a disk has decreased its accretion rate to a minimum value; this is expected to happen at the end of disk lifetime, observationally inferred to happen at an age of near 10 Myr. For this, we have used the model of Cameron and Campbell (1993) which enable to change the accretion rate with the time. After reproducing the rotation rates of Cameron and Campbell we have introduced an emerging radiative core in the star expected to be produced at this age, by means of two polytropes, one representing this core and the second, the convective envelope. A new distribution of internal energy of the star is formed that produces a linear decrease (independently of the values of initial accretion rates) of the stellar moment of inertia. Nevertheless always maintaining the global virialized equilibria. We have detected a new spin up process due to this internal stellar effect. Future studies will consider which will be the effect when a clearing mass of the disk is considered.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Rotational evolution of TTS using two polytropes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rotational evolution of TTS using two polytropes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotational evolution of TTS using two polytropes will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1666314

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.