The rotational velocity of low-mass stars in the Pleiades

Details The rotational velocity of low-mass stars in the Pleiades The rotational velocity of low-mass stars in the Pleiades

1998-03-11

arxiv.org/abs/astro-ph/9803138v1

Astron.Astrophys.335:183-198,1998

Astronomy and Astrophysics

Astrophysics

17 pages, 9 figures. Accepted for publication in Astronomy and Astrophysics Main Journal

Scientific paper

We present new vsini measurements for 235 low-mass stars in the Pleiades. The differential rotational broadening has been resolved for all the stars in our sample. These results, combined with previously published measurements, provide a complete and unbiased rotation data set for stars in the mass range from 0.6 to 1.2 Msol. Applying a numerical inversion technique on the vsini distributions, we derive the distributions of velocities for low-mass Pleiades members. Comparison of the rotational distributions of low-mass members between IC 2602/2391 and the Pleiades suggests that G dwarfs behave like solid-bodies and follow Skumanich's law during this time span. However, comparison between Pleiades and older clusters (M34 and Hyades) indicates that the braking of slow rotators on the early main sequence is weaker than predicted by an asymptotical Skumanich's law. This strongly supports the view that angular momentum tapped in the radiative core of slow rotators on the zero age main sequence (ZAMS) resurfaces into the convective envelope between Pleiades and Hyades age. For the G-dwarfs, we derive a characteristic coupling time scale between the core and the envelope of about 100--200Myr. The relationship between rotation and coronal activity in the Pleiades is in agreement with previous observations in other clusters and field stars. We show that the Rossby diagram provides an excellent description of the X-ray activity for all stars in the mass domain studied. The Pleiades data for slow and moderate rotators fills the gap between the X-ray--rotation correlation found for slow rotators and the X-ray ``saturation plateau'' observed for young fast rotators.

Affiliated with

Also associated with

No associations

Rating

The rotational velocity of low-mass stars in the Pleiades 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 The rotational velocity of low-mass stars in the Pleiades, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The rotational velocity of low-mass stars in the Pleiades will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-328494