We present results of photometric monitoring campaigns of G, K and M dwarfs in the Pleiades carried out in 1994, 1995 and 1996. We have determined rotation periods for 18 stars in this cluster. In this paper, we examine the validity of using observables such as X-ray activity and amplitude of photometric variations as indicators of angular momentum loss. We report the discovery of cool, slow rotators with high amplitudes of variation. This contradicts previous conclusions about the use of amplitudes as an alternate diagnostic of the saturation of angular momentum loss. We show that the X-ray data can be used as observational indicators of mass-dependent saturation in the angular momentum loss proposed on theoretical grounds.
@article{arxiv.astro-ph/9711284,
title = {New rotation periods in the Pleiades: Interpreting activity indicators},
author = {Anita Krishnamurthi and D. M. Terndrup and M. H. Pinsonneault and K. Sellgren and John R. Stauffer and R. Schild and D. E. Backman and K. B. Beisser and D. B. Dahari and A. Dasgupta and J. T. Hagelgans and M. A. Seeds and Rajan Anand and Bentley D. Laaksonen and Laurence A. Marschall and T. Ramseyer},
journal= {arXiv preprint arXiv:astro-ph/9711284},
year = {2009}
}
Comments
24 pages, LaTex (AASTeX); includes 8 postscript figures and 4 Latex tables. To appear in ApJ, Feb. 1, 1998. Postscript version of preprint can be obtained from http://casa.colorado.edu/~anitak/pubs.html