X-Ray Activity and Winds in Young A Stars at the Epoch of Disk Clearing

Details X-Ray Activity and Winds in Young A Stars at the Epoch of Disk Clearing X-Ray Activity and Winds in Young A Stars at the Epoch of Disk Clearing

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.1893g&link_type=abstract

Chandra Proposal ID #07200493

Physics

Chandra Proposal Id #07200493

Scientific paper

Herbig Ae stars which are still accreting material from their protoplanetary disks show a gradual evolution in X-ray luminosity and hardness ratio. They resemble T Tauri stars in driving microjets which can be imaged in Lyman alpha. Older A stars with more centrally cleared debris disks, like beta Pictoris, are not X-ray sources, but still have some stellar activity and can drive coronal winds. We wish to test the hypothesis that the change in the level of stellar activity and hardness of stellar activity signatures are linked to changes in the magnetic field strength and wind geometry. We are requesting 20ksec of Chandra and 2 orbits of HST time to observe two late-A Herbig Ae stars which appear to be transitional between the accreting objects and the debris disks.

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