ULLYSES Observing Strategies and Technical Specifications
The ULLYSES program is divided into two primary observational campaigns of high- and low-mass stars. The focus on high-mass stars includes observations of 70 OB stars in each of the Large (50% solar metallicity) and Small (20% solar metallicity) Magellanic Clouds, prioritizing the latter, as well as five to ten additional stars, which are accessible in the even lower metallicity Local Group galaxies NGC 3109 (10 to 20% solar metallicity), and Sextans A (10% solar metallicity). For low-mass stars, observations will focus on about 40 K- and M-type T Tauri stars and brown dwarfs within the Milky Way, including time-domain monitoring of four prototypical T Tauri stars with well-known rotation periods and magnetic configurations.
Observations of high-mass stars will consist of 200 orbits on the LMC targets, 250 orbits for those in the SMC, and 50 orbits for other low-metallicity Local Group galaxies. For low-mass stars, the grid will sample mass, age, and accretion rate over 400 orbits. 100 additional orbits will be allocated to the time-domain variability aspect of ULLYSES.
For inquiries, contact the ULLYSES team.