Simple Measures of Association for the Triple Dichotomy

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/147058/1/rssa01245.pd

Rotation, inflation, and lithium in the Pleiades

The rapidly rotating cool dwarfs of the Pleiades are rich in lithium relative to their slowly rotating counterparts. Motivated by observations of inflated radii in young, active stars, and by calculations showing that radius inflation inhibits pre-main sequence (pre-MS) Li destruction, we test whether this pattern could arise from a connection between stellar rotation rate and radius inflation on the pre-MS. We demonstrate that pre-MS radius inflation can efficiently suppress lithium destruction by rotationally induced mixing in evolutionary models, and that the net effect of inflation and rotational mixing is a pattern where rotation correlates with lithium abundance for $M_{*} < {\rm M}_{\odot}$, and anti-correlates with lithium abundance for $M_{*} > {\rm M}_{\odot}$, similar to the empirical trend in the Pleiades. Next, we adopt different prescriptions for the dependence of inflation on rotation, and compare their predictions to the Pleiades lithium/rotation pattern. We find that if a connection between rotation and radius inflation exists, then the important qualitative features of this pattern naturally and generically emerge in our models. This is the first consistent physical model to date that explains the Li--rotation correlation in the Pleiades. We discuss plausible mechanisms for inducing this correlation and suggest an observational test using granulation.Comment: 17 pages, 9 figures. A short video summarizing the results of our paper can be found here: https://www.youtube.com/watch?v=pnXFBCRQgd

Finding Earnesto: Temporary Labour Migration and Disbled Children's Health

We seek to expose the implications of Australia’s exclusionary and discriminatory disability migration provisions on the health and wellbeing of disabled children who have arrived in Australia through alternative migratory routes. By undertaking an in- depth analysis of a single case study, Ernesto, we bring to the fore the key issues facing disabled immigrant children. These children, like our case study Ernesto, are only granted visas on the proviso that their parents/primary caregivers agree to cover the full costs associated with their disability, including medical care and additional expenses such as educational inclusion. The story of Ernesto reveals the extreme impact of these discriminatory policies on this population’s health and wellbeing. Further, we discuss how the state’s “right to exclude” people with disabilities from the migratory process negatively affects the health and wellbeing of their siblings and parents