Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8317c&link_type=abstract
HST Proposal ID #8317
Physics
Hst Proposal Id #8317 Young Stars And Circumstellar Material
Scientific paper
We propose to obtain the first direct, accurate measurements of mass accretion rates for intermediate mass {1.5M{sun} to 3.5M{sun}} T Tauri stars {TTS}, precursors of the Beta Pic- type stars. Observations in the far and near ultraviolet with the low resolution STIS spectrographs will be used to measure the excess luminosity produced by the accretion of protoplanetary disk material onto the central star. These measurements cannot be made at optical wavelengths for these stars because of the lack of contrast between the excess emission and the photospheric flux. These observations, combined with our accretion shock column modelling, will provide for the first time measurements of the mass accretion rate for intermediate mass TTS. With these measurements and our existing infrared line fluxes, we will extend our present calibrations of accretion luminosity with emission line luminosity for low mass TTS to the entire range of mass covered by these stars. This will provide a po we rful tool for rapidly obtaining mass accretion rates for large samples of stars in different evolutionary stages and environments, enabling the effective study of stellar and protoplanetary disk formation and evolution.
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