ULLYSES

The Hubble UV Legacy Library of Young Stars as Essential Standards ("ULLYSES") is a Director's Discretionary program devoting ~1,000 HST orbits to the production of an ultraviolet spectroscopic library of young high- and low-mass stars in the local universe. The ULLYSES program uniformly samples the fundamental astrophysical parameter space for each mass regime -- including spectral type, luminosity class, and metallicity for massive OB stars (in the Magellanic Clouds and two other lower-metallicity nearby galaxies) and the mass, and disk accretion rate for low-mass T Tauri stars (in eight young Galactic star forming regions). The data will be gathered over a three-year period, from Cycle 27 through Cycle 29 (2020-2022). The data products are combined from individual, extracted and calibrated spectra obtained with the COS and STIS instruments on-board HST. Products are made using both archival HST data and new HST observations obtained through the ULLYSES program.

In addition to the MAST HLSP webpage here, you can read more about ULLYSES on their team page: https://ullyses.stsci.edu/index.html.  You can find out detailed information on the observations, the data processing, and access their spectral table.

Data Release 1 (05 Nov. 2020)

The first data release consists of multiple spectra for 115 massive stars in the Large and Small Magellanic Clouds. 43 of these 115 stars were recently observed with COS and STIS as part of the ULLYSES program; 8 of these 43 also have archival COS and STIS data. The remaining 72 targets have full UV coverage from archival programs (see the ULLYSES target lists for the LMC and SMC).

Data Release 2 (17 Mar. 2021)

The second ULLYSES data release consists of coadded and abutted HLSPs for 24 new ULLYSES targets in addition to updated HLSPs for 115 targets previously released in DR1 for a total of 139 ULLYSES targets. 126 targets are massive stars and 13 are T Tauri stars. An additional 5 non-ULLYSES targets are included as well, detailed on the ULLYSES Data Release 2 page.

Tips On Using Portal For ULLYSES Data

How Do I Select Only ULLYSES HLSP Files In The Portal (Before or After I Do A Search)?

How Do I See The Linked HST Datasets That Went Into Each HLSP Observation In My Basket?

ULLYSES Target Tables

Large Magellanic Cloud Targets (Jump To SMC Table | Jump To Orion OB1 Table | Jump To Sigma Orionis Cluster Table)

Small Magellanic Cloud Targets (Jump To LMC Target Table | Jump To Orion OB1 Table | Jump To Sigma Orionis Cluster Table)

Orion OB1 Association Targets (Jump To LMC Target Table | Jump To SMC Table | Jump To Sigma Orionis Cluster Table)

Orion OB1 Association Targets (Jump To LMC Target Table | Jump To SMC Table | Jump To Orion OB1 Table)