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 galaxy name; star designation; 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".

Additional information is available in the .csv file available for download here.

Target MAST Target Name RA(J2000) DEC(J2000) SpType V E(B-V) F225W F275W F336W F475W F814W Proposal ID Science Configuration First Observation Date Overall Status
NGC-3109-V01 NGC-3109-V01 16104 WFC3/UVIS Oct 27 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16104 01 Completed WFC3/UVIS: F225W + F275W + F336W + F475W + F814W Oct 27 2020
NGC-3109-V02 NGC-3109-V02 16104 WFC3/UVIS Nov 03 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16104 02 Completed WFC3/UVIS: F225W + F275W + F336W + F475W + F814W Nov 03 2020
SEXTANS-A SEXTANS-A 16104 WFC3/UVIS Jan 21 2022 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16104 03 Completed WFC3/UVIS: F225W + F275W + F336W + F475W + F814W Jan 21 2022
NGC-3109 EBU 07 NGC-3109-EBU-07 10h 02m 54.69s -26d 08m 59.64s B0-1Ia1 18.691 0.091 16.25 16.62 17.23 18.27 20.12 16511 COS/FUV Dec 03 2021 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16511 1C Failed COS/FUV: G140L/800 -
16511 AC Completed COS/FUV: G140L/800 Dec 03 2021
NGC-3109 EBU 20 NGC-3109-EBU-20 10h 03m 03.22s -26d 09m 21.41s O8I1 19.331 0.171 17.04 17.35 17.90 18.91 20.67 16511 COS/FUV Nov 29 2021 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16511 2C Failed COS/FUV: G140L/800 -
16511 3C Failed COS/FUV: G140L/800 -
16511 BC Completed COS/FUV: G140L/800 Nov 29 2021
16511 CC Completed COS/FUV: G140L/800 Dec 01 2021
NGC 3109 EBU 34 NGC-3109-EBU-34 10h 03m 14.24s -26d 09m 16.96s O8I(f)1 19.611 0.11 16.99 17.40 18.03 19.16 21.07 16511 COS/FUV Nov 30 2021 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16511 4C Failed COS/FUV: G140L/800 -
16511 DC Completed COS/FUV: G140L/800 Nov 30 2021
Sextans A GHN s4 SEXTANS-A-GHN-S4 10h 10m 57.89s -04d 43m 10.2s O6z2 20.92 0.052 18.05 18.45 19.17 20.37 22.38 16930 COS/FUV Oct 23 2022 - Nov 21 2022 In Progress
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16930 2C Scheduling COS/FUV: G140L/800 Oct 23 2022 - Nov 21 2022
Sextans A GHN s2 SEXTANS-A-GHN-S2 10h 10m 58.59s -04d 43m 28.9s O3-5Vz2 20.82 0.222 18.49 18.84 19.41 20.47 20.08 16930 COS/FUV Oct 23 2022 - Nov 21 2022 In Progress
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16930 1C Scheduling COS/FUV: G140L/800 Oct 23 2022 - Nov 21 2022
16930 1D Scheduling COS/FUV: G140L/800 Oct 23 2022 - Nov 21 2022
16930 1E Scheduling COS/FUV: G140L/800 Oct 23 2022 - Nov 21 2022
Sextans A GHN s8 SEXTANS-A-GHN-S8 10h 11m 05.69s -04d 42m 13.6s B0 I3 19.73 0.053 17.38 17.71 18.30 19.28 21.16 16930 COS/FUV Oct 23 2022 - Nov 16 2022 In Progress
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16930 3C Scheduling COS/FUV: G140L/800 Oct 23 2022 - Nov 16 2022
16930 3D Scheduling COS/FUV: G140L/800 Oct 23 2022 - Nov 16 2022

1 2007ApJ...659.1198E
2 2019MNRAS.484..422G
3 Garcia, priv. comm.

Last Updated: Sep 20, 2022

Charting young stars’ ultraviolet light with Hubble.

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