TY - JOUR T1 - The UV Legacy Library of Young Stars as essential standards (ULLYSES) large Director’s Discretionary program with Hubble. I. goals, design, and initial results JO - The Astrophysical Journal UR - https://eprints.whiterose.ac.uk/id/eprint/226843 PY - 2025/05/16 AU - Roman-Duval J AU - Fischer WJ AU - Fullerton AW AU - Taylor J AU - Plesha R AU - Proffitt C AU - Monroe T AU - Fischer TC AU - Aloisi A AU - Bouret J-C AU - Britt C et al ED - DO - DOI: 10.3847/1538-4357/adc45b PB - American Astronomical Society VL - 985 IS - 1 Y2 - 2025/12/01 ER -