Poster abstract details
A new statistical distance scale based on MSX data
Abstract
Statistical distance scales, when correctly evaluated, constitute a robust alternative if they are based on a large sample with accurate observational parameters. Nevertheless many methods available in the literature make use of visual data that are severely affected by reddening.
In this work we propose a statistical method based on a relationship between the age and the specific intensity of the radiation emitted in the MSX bands.
An analysis of some theoretical evolutionary models shows that, during the first $2 imes 10^3$ years, the nebular radius seems to increase at a nearly constant rate. This effect occurs because even though the various gas shells expand at different velocities, they might be observed as a single shell in radio images, for example.
Distances are evaluated for a hundred objects in various directions of the Galactic disc. The present method is
especially suited for young, compact planetary nebulae in the Galactic disc, severely affected by
interstellar extinction.
In this work we propose a statistical method based on a relationship between the age and the specific intensity of the radiation emitted in the MSX bands.
An analysis of some theoretical evolutionary models shows that, during the first $2 imes 10^3$ years, the nebular radius seems to increase at a nearly constant rate. This effect occurs because even though the various gas shells expand at different velocities, they might be observed as a single shell in radio images, for example.
Distances are evaluated for a hundred objects in various directions of the Galactic disc. The present method is
especially suited for young, compact planetary nebulae in the Galactic disc, severely affected by
interstellar extinction.