Peculiar Abundances in the TW Hydrae Association

Details Peculiar Abundances in the TW Hydrae Association Peculiar Abundances in the TW Hydrae Association

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..210a&link_type=abstract

XMM-Newton Proposal ID #04056103

Physics

Stars, White Dwarfs, Solar System, Twa 6, Twa 7, Twa 8, Xmm-Newton Proposal 04056103

Scientific paper

The Ne/Fe abundance ratio in young stars is presently a riddle. We ask for 30ks to observe 3 selected weak-lined T Tauri stars of the TW Hydrae Association (TWA) in order to evaluate the Ne/Fe abundance ratio for this region. Two classical T Tauri stars of this association, TW Hydrae and TWA5, show very large Ne/Fe ratios: Ne/Fe~10(Ne/Fe)_sun. The proposed observations will allow us to distinguish between the two different scenarios: (a) this peculiar abundances are common among stars in the TWA, because the molecular cloud from which the stars originated had Ne/Fe much higher than current accepted cosmic value; or (b) the evolutionary stage of TW Hya and TWA5, which are still accreting material from their circumstellar disks, is the cause of the enhanced Ne/Fe.

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