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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 1.

Distribution of ULLYSES targets in H-R diagrams for the LMC (left panel) and SMC (right panel). The locations of individual stars were determined from model parameters available in the literature at the outset of ULLYSES (“Modeled”) or by using the spectral-type calibrations of E. I. Doran et al. (2013; “Adopted”). Single-star evolutionary tracks from the BoOST grid (D. Szécsi et al. 2022) computed for an initial rotational velocity of 100 km s⁻¹ are also shown. Small dots along the tracks indicate intervals of 0.5 Myr.

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