The stellar disk component: distribution, motions, age and stellar composition

Hydrodynamical Description of Stellar Motions

Stellar Mass Dependent Disk Dispersal

We use published optical spectral and IR excess data from nine young clusters and associations to study the stellar mass dependent dispersal of circumstellar disks. All clusters older than ∼3Myr show a decrease in disk fraction with increasing stellar mass for Solar to higher mass stars. This result is significant at about the 1σ level in each cluster. For the complete set of clusters we reject...

Stellar Disk in the Galaxy Malin

Since its discovery, Malin 1 has been considered the prototype and most extreme example of the class of giant low surface brightness disk galaxies. Examination of an archival Hubble Space Telescope I-band image reveals that Malin 1 contains a normal stellar disk that was not previously recognized, having a central I-band surface brightness of µ 0 = 20.1 mag arcsec −2 and a scale length of 4.8 k...

The distribution of stellar population age in galactic bars

Context. Recent analysis of stellar populations in barred galaxies have focused on the spatial distribution of stellar population ages and metallicities. However, barred galaxies are complex objects where dynamical instabilities play a leading role in shaping any spatial

Disk Heating and Stellar Migration in Galaxies

We show that a typical star is unlikely to migrate from its galacto-centric radius of birth by more than about 5% over its lifetime. Radial migration, or a secular change in a star’s angular momentum, is caused by stochastic scattering by spiral waves and by dense gas complexes. The expected change in angular momentum is related to the radial action acquired by the star from these processes and...