dc.contributor.author | Matt, Sean P. | |
dc.contributor.author | Brun, Allan Sacha | |
dc.contributor.author | Baraffe, I. | |
dc.contributor.author | Bouvier, Jerome | |
dc.contributor.author | Chabrier, G. | |
dc.date.accessioned | 2015-04-14T15:08:29Z | |
dc.date.issued | 2015-01-29 | |
dc.description.abstract | To better understand the observed distributions of rotation rate and magnetic activity of sun-like and low-mass stars, we derive a physically motivated scaling for the dependence of the stellar-wind torque on Rossby number. The torque also contains an empirically-derived scaling with stellar mass (and radius), which provides new insight into the mass-dependence of stellar magnetic and wind properties. We demonstrate that this new formulation explains why the lowest mass stars are observed to maintain rapid rotation for much longer than solar-mass stars, and simultaneously, why older populations exhibit a sequence of slowly rotating stars, in which the low-mass stars rotate more slowly than solar-mass stars. The model also reproduces some previously unexplained features in the period-mass diagram for the Kepler field, notably: the particular shape of the "upper envelope" of the distribution, suggesting that ~95% of Kepler field stars with measured rotation periods are younger than ~4 Gyr; and the shape of the "lower envelope," corresponding to the location where stars transition between magnetically saturated and unsaturated regimes. | en_GB |
dc.identifier.citation | Vol. 799 (2), article L23 | en_GB |
dc.identifier.doi | 10.1088/2041-8205/799/2/L23 | |
dc.identifier.uri | http://hdl.handle.net/10871/16813 | |
dc.language.iso | en | en_GB |
dc.publisher | American Astronomical Society | en_GB |
dc.relation.url | http://hdl.handle.net/10871/36248 | |
dc.rights | © 2015. The American Astronomical Society. All rights reserved. | |
dc.subject | magnetohydrodynamics (MHD) | en_GB |
dc.subject | stars: evolution | en_GB |
dc.subject | stars: late-type | en_GB |
dc.subject | stars: magnetic field | en_GB |
dc.subject | stars: rotation | en_GB |
dc.subject | stars: winds, outflows | en_GB |
dc.title | The Mass-Dependence of Angular Momentum Evolution in Sun-Like Stars | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2015-04-14T15:08:29Z | |
dc.identifier.issn | 2041-8205 | |
dc.description | The erratum to this article is in ORE at http://hdl.handle.net/10871/36248 | |
dc.identifier.eissn | 2041-8213 | |
dc.identifier.journal | Astrophysical Journal Letters | en_GB |