Other
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9790j&link_type=abstract
HST Proposal ID #9790
Other
Hst Proposal Id #9790 Star Formation
Scientific paper
Due to their unique evolutionary state, the naked {non-accreting} T Tauri stars {NTTS} are the only real proxies for what the underlying magnetically active star of a classical TTS {CTTS} system looks like. Comparative analysis then allows us to separate stellar properties from accretion properties in CTTS. In addition, the late-type NTTS are excellent candidates for studying rotation-activity relationships in fully convective stars and probing the properties of turbulent dynamos. With the limited data currently available, NTTS appear to be very magnetically active stars with higher than expected H-alpha/X-ray flux ratios but lower transition region fluxes relative to other active stars. However, the data are very incomplete. We will use HST-STIS observations of transition region line fluxes on 11 fully convective NTTS to establish the level and structure of dynamo generated emission in these young stars. In principal, these far ultraviolet emission lines are sensitive diagnostics of mass accretion onto CTTS, since accretion shocks on the stellar surface should produce substantial emission measure at 10^5 - 10^6 K. However, it is imperative that we first understand the emissions from NTTS before we can use these lines to study accretion onto CTTS.
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