Coronal activity among open cluster stars
| dc.creator | Randich, S. | |
| dc.date | 1999-09-08 | |
| dc.date.accessioned | 2026-07-07T02:33:10Z | |
| dc.date.available | 2026-07-07T02:33:10Z | |
| dc.description | Focusing on ROSAT results for clusters in the $\sim 20-600$ Myr range, I first summarize our current understanding of the X-ray activity - rotation - age relationship. Then, the problem of the Hyades K and M dwarfs binaries is addressed: 1. most K and M-type binaries in wide systems are X-ray brighter than single stars; 2. binaries seem to fit into the same activity - rotation relationship as single stars. Points 1. and 2. suggest that the distributions of rotations of single and binary stars should also show a dicothomy, but the few available rotational data do not support the existence of such a dicothomy. Rotational periods for a larger sample of binary and single stars should be acquired before any conclusion is drawn. Finally, I discuss the topic whether the activity-age dependence is unique, as commonly thought. Whereas the comparison of Praesepe to the Hyades might imply that this is not the case, the X-ray activity of a sample of Hyades-aged field stars instead supports the common thinking. | |
| dc.description | 10 pages, 3 figures, to appear in Stellar Clusters and Associations: Convection, Rotation, and Dynamos, Mondello, Italy, May 1999, eds. R. Pallavicini and G. Micela, ASP Conference Series | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9909139 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9909139 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/14733 | |
| dc.subject | Astrophysics | |
| dc.title | Coronal activity among open cluster stars | |
| dc.type | text |