Valenti, Jeff A.

Contact Email: valenti@stsci.edu
Institute: STScI
First Coauthor: Chris M. Johns-Krull
Institute: Artie Hatzes
Subject Area: Star Formation, Very Young Stars, T-Tauri, H-H Objects
Waveband: Optical
Technique: Spectroscopy
Presentation: Poster Display
Title: Time Series Spectropolarimetry of T Tauri Stars
Abstract: We present 6 nights of spectropolarimetry and simultaneous photometry for the T Tauri stars AA Tau, BP Tau, DF Tau, and DK Tau. We determine the net longitudinal magnetic field (Bz) on the star using photospheric absorption lines. We determine Bz separately in the accretion zones from circularly polarized helium emission lines. We compare changes in magnetic field, veiling, emission line strength, velocity shifts, and broad band colors. We explore whether simple magnetically controlled accretion geometries are consistent with the data.