Speaker
Konstantin Getman
(Pennsylvania State University)
Description
This study is based on YSO samples from the MYStIX and SFiNCs surveys, and a new estimator of pre-main sequence stellar ages, AgeJX, derived from X-ray and near-infrared photometric data. We present two main results here. First, the discovery of the core-halo age gradients (with younger cores and older halos) in numerous morphologically simple, isolated, and relatively rich stellar clusters. The observed spatio-age gradients can be explained within the framework of the global hierarchical collapse model. Second, the MYStIX+SFiNCs cluster surveys provide the largest cluster dataset to date to study circumstellar disk longevity in young (<=4Myr) clusters. By imposing similar stellar mass sensitivity limits for disky and diskless YSOs and assuming disk fraction of 100% at the zero age we estimate an exponential disk half-life of 2 Myr (based on AgeJX age scale). This value agrees closely with the results of a few previous works.
Primary author
Konstantin Getman
(Pennsylvania State University)
Co-authors
Alex Richert
(Pennsylvania State University)
Eric Feigelson
(Pennsylvania State University)
Gordon Garmire
(Huntingdon Institute for X-ray Astronomy)
Matthew Bate
(University of Exeter)
Matthew Povich
(California State Polytechnic University)
Michael Kuhn
(Universidad de Valparaiso)
Patrick Broos
(Pennsylvania State University)
