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Full-Text Articles in Physical Sciences and Mathematics
Helium Emission From Classical T Tauri Stars: Dual Origin In Magnetospheric Infall And Hot Wind, Georgina Beristain, Suzan Edwards, John Kwan
Helium Emission From Classical T Tauri Stars: Dual Origin In Magnetospheric Infall And Hot Wind, Georgina Beristain, Suzan Edwards, John Kwan
Astronomy: Faculty Publications
High-resolution emission-line profiles of He I and He II in 31 classical T Tauri stars are analyzed with the aim of probing the environs of the star-disk interface in accreting low-mass young stars. The diagnostic power of the helium lines lies in their high-excitation potentials, which restrict their formation to a region either of high temperature or close proximity to a source of ionizing radiation. The He I profiles are decomposed into kinematic components that support the paradigm of magnetically controlled accretion from the disk onto the stellar surface but also require a significant contribution from a hot wind. A …
Hα Imaging With Hubble Space Telescope-Nicmos Of An Elusive Damped Lyα Cloud At Z = 0.61, Nicolas Bouché, James D. Lowenthal, Jane C. Charlton, Matthew A. Bershady, Christopher W. Churchill, Charles C. Steidel
Hα Imaging With Hubble Space Telescope-Nicmos Of An Elusive Damped Lyα Cloud At Z = 0.61, Nicolas Bouché, James D. Lowenthal, Jane C. Charlton, Matthew A. Bershady, Christopher W. Churchill, Charles C. Steidel
Astronomy: Faculty Publications
Despite previous intensive ground-based imaging and spectroscopic campaigns and wideband Hubble Space Telescope (HST) imaging of the z = 0.927 QSO 3C 336 field, the galaxy that hosts the damped Lyα system along this line of sight has eluded detection. We present a deep narrowband Hα image of the field of this zabs = 0.656 damped Lyα absorber, obtained through the F108N filter of NICMOSI on board the HST. The goal of this project was to detect any Hα emission 10 times closer than previous studies to unveil the damped absorber. We do not detect Hα emission between 0".05 and …