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NUV Excess in Slowly Accreting T Tauri Stars: Limits Imposed by Chromospheric Emission
Laura Ingleby, Nuria Calvet, Edwin Bergin +20
Young stars surrounded by disks with very low mass accretion rates are likely in the final stages of inner disk evolution and therefore particularly interesting to study. We presen…
Far Ultraviolet Continuum Emission: Applying this Diagnostic to the Chromospheres of Solar-Mass Stars
Jeffrey L. Linsky, Rachel Bushinsky, Tom Ayres +2
The far ultraviolet (FUV) continuum flux is recognized as a very sensitive diag- nostic of the temperature structure of the Sun's lower chromosphere. Until now analysis of the avai…
CO and H2 Absorption in the AA Tauri Circumstellar Disk
Kevin France, Eric B. Burgh, Gregory J. Herczeg +7
The direct study of molecular gas in inner protoplanetary disks is complicated by uncertainties in the spatial distribution of the gas, the time-variability of the source, and the…
The Far-Ultraviolet "Continuum" in Protoplanetary Disk Systems II: CO Fourth Positive Emission and Absorption
Kevin France, Rebecca Schindhelm, Eric B. Burgh +21
We exploit the high sensitivity and moderate spectral resolution of the -Cosmic Origins Spectrograph to detect far-ultraviolet spectral features of carbon monoxide (CO) presen…
HST/COS Spectra of DF Tau and V4046 SGR: First Detection of Molecular Hydrogen Absorption Against the Ly Emission Line
Hao Yang, Jeffrey L. Linsky, Kevin France
We report the first detection of molecular hydrogen (H) absorption in the Lyman- emission line profiles of two classical T Tauri stars (CTTSs), DF Tau and V4046 Sgr, obser…