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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 13.

Narrow absorption components (NACs) in the N V (top panels) and C IV (bottom panels) doublets of two O4 dwarfs in the SMC. The velocity scale refers to the blue component of the doublet, and has been shifted to remove the systemic velocity of the SMC. The separation of the components of the doublet is indicated by brackets at 0 velocity, and matches the separation of the NACs near the blue edge of the P Cygni absorption trough. Strong interstellar features associated with the Milky Way (near velocity of −170 km s⁻¹ ) and SMC (near 0 velocity) and are visible in the C IV profile.

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