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The UV Legacy Library of Young Stars as Essential Standards (ULLYSES) Large Director’s Discretionary Program with Hubble. I. Goals, Design, and Initial Results

Authors: Julia Roman-Duval, William J. Fischer, Alexander W. Fullerton, Jo Taylor, Rachel Plesha, Charles Proffitt, TalaWanda Monroe, Travis C. Fischer, Alessandra Aloisi, Jean-Claude Bouret, Christopher Britt, Nuria Calvet, Joleen K. Carlberg, Paul A. Crowther, Gisella De Rosa, William V. Dixon, Catherine C. Espaillat, Christopher J. Evans, Andrew J. Fox, Kevin France, Miriam Garcia, Scott W. Fleming, Elaine M. Frazer, Ana I. Gómez de Castro, Gregory J. Herczeg, Svea Hernandez, Alec S. Hirschauer, Bethan L. James, Christopher M. Johns-Krull, Claus Leitherer, Sean Lockwood, Joan Najita, M. S. Oey, Cristina Oliveira, Tyler Pauly, I. Neill Reid, Adric Riedel, David R. Rodriguez, David Sahnow, Ravi Sankrit, Kenneth R. Sembach, Richard Shaw, Linda J. Smith, S. Tony Sohn, Debopam Som, Leonardo Úbeda, Daniel E. Welty

Julia Roman-Duval et al 2025 The Astrophysical Journal 985 .

Provider: AAS Journals

Caption: Figure 8.

Top panel: peak C IV flux as a function of accretion rate for the 49 “survey” TTS in the ULLYSES sample (excluding archival targets) for which a coadded G160M spectrum was created. The central dashed line indicates the peak C IV flux predicted from the accretion rates reported in the literature, using fits in the templates used for exposure time calculations (see Section A.3), while the tip of the arrows indicate the actual measured peak flux. TTS for which the difference between the flux predicted from the previously measured accretion rate and the flux measured in the ULLYSES spectra is over an order of magnitude are indicated. Bottom panel: ratio of actual to predicted C IV peak flux in the sample sample of TTS as a function of accretion rate reported in the literature.

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