Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12315g&link_type=abstract
HST Proposal ID #12315. Cycle 18
Physics
Scientific paper
Classical T Tauri stars {CTTS} show strong, broad and asymmetric FUV emission lines. Neither the width, nor the line profile is understood. Likely, different mechanisms influence the line profile; the best candidates are accretion, winds and stellar activity.We propose to monitor the CIV 1548/1550 Ang doublet in the nearby, bright CTTS TW Hya and to correlate it with i} the cool wind, as seen in COS NUV MgII line profiles, ii} the photometric period from joint ground-based monitoring, iii} the accretion rate as determined from the UV continuum and iv} the Ha line profile from independent ground-based observations. We request 10 orbits distributed over a few weeks to cover the typical time scales of stellar rotation, accretion and winds. With this data we can identify the FUV emission region, test for the presence of a hot wind, identify its properties, and characterize the variability of the accretion region.;
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