ULLYSES LOW-Z

Low-Metallicity Galaxy OB Stars

Observations of the six ULLYSES high-mass stars in the low-metallicity galaxies Sextans A and NGC 3109 will be obtained during HST cycles 27-29 with COS/G140L/800. Additionally, pre-imaging data will be obtained of NGC 3109 and Sextans A with WFC3/UVIS.

For each star, the table below gives the generally accepted target name (with a link to SIMBAD); the name used by the ULLYSES team in certain documentation; the target names as they appear in the MAST archive, with the name adopted by the ULLYSES team in bold; the stellar position (generally from Gaia DR2 or 2MASS); the adopted spectral type; V magnitude; and total E(B-V) (i.e., Galactic plus the external galaxy’s); and photometry for 5 WFC3 filters listed in units of STmag (errors are of order of 0.05-0.1mag). Three additional columns will be populated (when the information exists), giving the proposal ID, the science configuration (indicating which instruments and channels will be used), the date of the first observation of that target, and the status of all observations for the target. Further information about each visit can be found by clicking on the row for the target of interest. An additional table will appear that will contain the visit ID, the scheduling status of that visit, a more detailed science configuration (including grating and central wavelength), and the observation date for each visit.

The "Overall Status" column shows the current observational status of a target. Targets with complete wavelength coverage are marked as "Completed". Targets with partial wavelength coverage and/or with currently scheduled observations are marked as "In Progress". Targets with no wavelength coverage and no currently scheduled observations are marked as "Not Yet Implemented".

The ULLYSES search form supports querying targets and datasets based on both observational and astrophysical parameters. In addition to specialized search parameters, the form also features direct data file downloads, customized API script generation, and the ability to export the metadata and references to a downloadable file. The “Simbad Resolvable Name” in this table should aid in querying specific targets on the search form. All low-metallicity targets can be accessed here. While we are in the process of updating the ULLYSES catalog, some metadata might not match between the ULLYSES search form and this target table. The values here may not include recent updates based on literature reviews. Please use the ULLYSES search form for the most up-to-date information.