ULLYSES LOW-Z

Low-Metallicity Galaxy OB Stars

The ULLYSES sample for stars in low-metallicity galaxies consists of two parts. The core sample (Table 1) includes six high-mass stars in the low-metallicity galaxies Sextans A and NGC 3109 with spectroscopic data that is consistent with the design goals in terms of wavelength coverage and signal-to-noise. The HST UV spectroscopy for the core sample is a mixture of new data collected during HST Cycles 27–29 and archival data. Additionally, pre-imaging data was obtained of NGC 3109 and Sextans A with WFC3/UVIS (Table 3).

The core sample is augmented by a subset of stars with purely archival data that meet many, though not necessarily all, of the project’s design goals, but nevertheless provides supplementary material that contributes directly to the scientific goals of ULLYSES. These "extra" targets and their HST UV spectroscopic material are summarized in Table 2.

In both Tables, successive columns record:

Table 1 also contains photometry for 5 WFC3 filters (F225W, F275W, F336W, F475W, F814W) listed in units of STmag with errors on the order of 0.05-0.1mag. Simbad target names are hyperlinked to their entry in Simbad, which provides a complete list of aliases, while the ULLYSES target names are hyperlinked to the specific entry in the ULLYSES catalog. References to the source of observational information are also linked.

Four additional columns summarize the HST spectra held by MAST by providing:

Clicking anywhere in a row will also open a table that provides more detailed information about the observations in each visit.

Tables 1 and 2 contain a subset of the information accessible from the ULLYSES search form, which supports querying targets and datasets based on both observational and astrophysical parameters. The "Simbad Resolvable Name" should aid in querying specific targets in the search form. In addition to specialized search parameters, the form also:

Information for all ULLYSES targets in low-metallicity galaxies can be accessed directly via this predefined query.

Table 1: ULLYSES Core Sample

Simbad Resolvable Name ULLYSES Target Name APT Target Name RA(J2016) DEC(J2016) SpType V E(B-V) F225W F275W F336W F475W F814W Proposal ID Science Configuration First Observation Date Overall Status
[EBU2007] 7 NGC 3109 EBU 07 NGC-3109-EBU-07 10h 02m 54.72s -26d 08m 59.66s B0-1 Ia 18.69 0.09 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
[EBU2007] 20 NGC 3109 EBU 20 NGC-3109-EBU-20 10h 03m 03.30s -26d 09m 21.34s O8 I 19.33 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
[EBU2007] 34 NGC 3109 EBU 34 NGC-3109-EBU-34 10h 03m 14.31s -26d 09m 17.90s O8 I(f) 19.61 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
[VPW98] 1805 Sextans A LGN s004 SEXTANS-A-LGN-S004, SEXTANS-A-GHN-S4 10h 10m 57.89s -04d 43m 10.20s O5 III 20.92 0.0 18.05 18.45 19.17 20.37 22.38 16930 COS/FUV Dec 06 2022 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16930 2C Completed COS/FUV: G140L/800 Dec 06 2022
[VPW98] 1670 Sextans A LGN s003 SEXTANS-A-LGN-S003, SEXTANS-A-GHN-S2 10h 10m 58.58s -04d 43m 28.94s O3-5 Vz 20.8 0.19 18.49 18.84 19.41 20.47 20.08 16930 COS/FUV Oct 26 2022 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16930 1C Completed COS/FUV: G140L/800 Oct 26 2022
16930 1D Completed COS/FUV: G140L/800 Dec 05 2022
16930 1E Completed COS/FUV: G140L/800 Dec 10 2022
[VPW98] 412 Sextans A LGN s071 SEXTANS-A-LGN-S071, SEXTANS-A-GHN-S8 10h 11m 05.68s -04d 42m 13.63s B1 I 19.7 0.0 17.38 17.71 18.30 19.28 21.16 16930 COS/FUV Dec 08 2022 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16930 3C Completed COS/FUV: G140L/800 Dec 08 2022
16930 3D Completed COS/FUV: G140L/800 Dec 11 2022

Table 2: Additional Archival Stars Included in the ULLYSES sample

Simbad Resolvable Name ULLYSES Target Name APT Target Name RA(J2016) DEC(J2016) SpType V E(B-V) Proposal ID Science Configuration First Observation Date Overall Status
[BPU2006] A 11 WLM BPU A 11 WLM-BPU-A11, WLM-A11 00h 01m 59.95s -15d 28m 19.58s O9.7 Ia 18.38 0.15 12867 COS/FUV Jun 13 2013 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12867 05 Completed COS/FUV: G130M/1291/1327 Jun 13 2013
12867 06 Completed COS/FUV: G160M/1577/1589/1611/1623 Jun 14 2013
[BPU2006] A 15 WLM BPU A 15 WLM-BPU-A15, WLM 00h 02m 00.53s -15d 29m 52.41s O7 V((f)) 20.25 0.0 15967 COS/FUV Jun 20 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15967 01 Completed COS/FUV: G130M/1291 Jun 20 2020
15967 02 Completed COS/FUV: G160M/1600 Jun 24 2020
15967 03 Completed COS/FUV: G160M/1600 Jun 26 2020
[BUG2007] C 10 IC1613 BUG C10 IC1613-BUG-C10, IC1613-C10 01h 04m 43.38s +02d 10m 22.38s B1.5 Ib 18.82 15156 COS/FUV Nov 25 2018 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15156 1A Completed COS/FUV: G130M/1291 Dec 14 2018
15156 1B Failed COS/FUV: G160M/1577 Nov 25 2018
15156 5C Completed COS/FUV: G160M/1577 Dec 24 2018
[BUG2007] B 11 IC1613 BUG B11 IC1613-BUG-B11, IC1613-B11 01h 04m 43.83s +02d 06m 45.16s O9.5 I 18.62 0.13 12867, 15880 COS/FUV Sep 22 2013 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12867 03 Completed COS/FUV: G130M/1291/1327 Sep 22 2013
12867 04 Completed COS/FUV: G160M/1577/1589/1611/1623 Sep 22 2013
15880 01 Completed COS/FUV: G130M/1291 Jan 23 2020
[BUG2007] B 4 IC1613 BUG B4 IC1613-BUG-B4, IC1613-010460-020916 01h 04m 59.56s +02d 09m 16.21s B1.5 Ia 18.23 0.05 12587 COS/FUV Jul 15 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 09 Completed COS/FUV: G140L/1105 Jul 15 2012
[GHV2009] Star 61331 IC1613 GHV 61331 IC1613-GHV-STAR-61331, IC1613-61331 01h 05m 00.16s +02d 09m 13.19s O9.7 II 19.14 0.05 15880 COS/FUV Jun 19 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15880 10 Completed COS/FUV: G130M/1291/1309 Jun 19 2020
[GHV2009] Star 62024 IC1613 GHV 62024 IC1613-GHV-STAR-62024, IC1613-010501-020849, IC1613-62024 01h 05m 00.65s +02d 08m 49.35s O6.5 IIIf 19.6 0.11 12587, 15880 COS/FUV Nov 17 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 04 Completed COS/FUV: G140L/1105 Nov 17 2012
15880 07 Completed COS/FUV: G130M/1291/1309 Jun 27 2020
15880 08 Completed COS/FUV: G130M/1291/1309 Jul 01 2020
[BUG2007] A 10 IC1613 BUG A10 IC1613-BUG-A10, IC1613-010501-021041 01h 05m 00.92s +02d 10m 41.59s B1 Ia 17.42 0.08 12587 COS/FUV Jul 19 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 07 Completed COS/FUV: G140L/1105 Jul 19 2012
[BUG2007] B 7 IC1613 BUG B7 IC1613-BUG-B7, IC1613-010502-020805 01h 05m 01.98s +02d 08m 05.16s O9 II 18.96 0.05 12587, 15156 COS/FUV Nov 11 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 06 Completed COS/FUV: G140L/1105 Nov 11 2012
15156 2A Completed COS/FUV: G130M/1291 Nov 23 2018
15156 2B Completed COS/FUV: G160M/1577 Nov 23 2018
[GHV2009] Star 64066 IC1613 GHV 64066 IC1613-GHV-STAR-64066, IC1613-64066 01h 05m 02.08s +02d 09m 28.17s O3 III((f)) 19.03 0.07 15880 COS/FUV Jun 20 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15880 04 Failed COS/FUV: G130M/1291/1309 Jun 20 2020
15880 24 Completed COS/FUV: G130M/1291/1309 Aug 01 2020
[BUG2007] B 2 IC1613 BUG B2 IC1613-BUG-B2, IC1613-010503-021004, IC1613-B2 01h 05m 03.07s +02d 10m 04.64s O7.5 III-V((f)) 19.62 0.07 12587, 15880 COS/FUV Nov 03 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 02 Completed COS/FUV: G140L/1105 Nov 03 2012
12587 03 Completed COS/FUV: G140L/1105 Nov 10 2012
15880 05 Completed COS/FUV: G130M/1291/1309 Jun 25 2020
15880 06 Completed COS/FUV: G130M/1291/1309 Jun 26 2020
[GHV2009] Star 67559 IC1613 GHV 67559 IC1613-GHV-STAR-67559, IC1613-010505-020923, IC1613-67559 01h 05m 04.77s +02d 09m 23.28s O8.5 III((f)) 19.24 0.07 12587, 15880 COS/FUV Nov 12 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 05 Completed COS/FUV: G140L/1105 Nov 12 2012
15880 11 Failed COS/FUV: G130M/1291/1309 Jun 29 2020
15880 25 Completed COS/FUV: G130M/1309 Aug 06 2020
[GHV2009] Star 67684 IC1613 GHV 67684 IC1613-GHV-STAR-67684, IC1613-67684 01h 05m 04.89s +02d 09m 32.67s O8.5 I 19.02 0.05 15880 COS/FUV Jun 29 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15880 09 Completed COS/FUV: G130M/1291/1309 Jun 29 2020
[BUG2007] A 13 IC1613 BUG A13 IC1613-BUG-A13, IC1613-010506-021043, IC1613-A13 01h 05m 06.26s +02d 10m 43.26s O3-4 V((f)) 18.96 0.05 12587, 12867, 15880 COS/FUV Jul 27 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 01 Completed COS/FUV: G140L/1105 Jul 27 2012
12867 01 Completed COS/FUV: G130M/1291/1327 Jun 05 2013
12867 02 Completed COS/FUV: G160M/1577/1589/1611/1623 Jun 16 2013
15880 02 Completed COS/FUV: G130M/1291 Nov 18 2019
[BUG2007] B 3 IC1613 BUG B3 IC1613-BUG-B3, IC1613-010506-020931, IC1613-B3 01h 05m 06.38s +02d 09m 31.41s B0 Ia 17.69 0.1 12587, 15880 COS/FUV Jul 19 2012 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
12587 08 Completed COS/FUV: G140L/1105 Jul 19 2012
15880 03 Completed COS/FUV: G130M/1291/1309 Jun 09 2020
LGGS J101053.81-044113.0 Sextans A LGN s014 SEXTANS-A-LGN-S014, SEXTANS-A-OB326, STAR-J101053.81-044113.0 10h 10m 53.80s -04d 41m 13.11s O7.5 III((f)) 20.69 0.01 14245, 15880 COS/FUV Dec 11 2015 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
14245 01 Completed COS/FUV: G140L/1105 Dec 11 2015
14245 02 Completed COS/FUV: G140L/1105 Dec 15 2015
14245 03 Completed COS/FUV: G140L/1105 Mar 18 2016
15880 19 Completed COS/FUV: G130M/1291 Mar 31 2020
15880 20 Completed COS/FUV: G130M/1291/1309 Apr 01 2020
15880 21 Completed COS/FUV: G130M/1309 Jan 03 2020
LGGS J101056.86-044040.8 Sextans A LGGS J101056.86-044040.8 SEXTANS-A-LGGS-J101056M044040, SA2 10h 10m 56.85s -04d 40m 40.90s O 20.41 0.0 16767 COS/FUV Dec 01 2021 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16767 08 Completed COS/FUV: G130M/1291 Jan 20 2022
16767 09 Completed COS/FUV: G130M/1291 Dec 01 2021
16767 10 Completed COS/FUV: G160M/1600 Dec 02 2021
16767 11 Completed COS/FUV: G160M/1600 Dec 04 2021
16767 12 Completed COS/FUV: G160M/1600 Dec 02 2021
16767 13 Completed COS/FUV: G160M/1600 Dec 04 2021
[VPW98] 1744 Sextans A LGN s029 SEXTANS-A-LGN-S029, SEXTANS-A 10h 10m 58.19s -04d 43m 18.46s O8.5 III 20.8 0.02 15967 COS/FUV May 29 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15967 04 Completed COS/FUV: G130M/1291 May 29 2020
15967 05 Completed COS/FUV: G160M/1600 Jun 04 2020
15967 06 Completed COS/FUV: G160M/1600 Jun 06 2020
LGGS J101100.66-044044.3 Sextans A LGN s050 SEXTANS-A-LGN-S050, SEXTANS-A-OB321, STAR-J101100.66-044044.3 10h 11m 00.65s -04d 40m 44.40s O9.7 I 19.61 0.01 14245, 15880 COS/FUV Mar 19 2016 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
14245 07 Completed COS/FUV: G140L/1105 Mar 20 2016
14245 08 Completed COS/FUV: G140L/1105 Mar 19 2016
15880 16 Completed COS/FUV: G130M/1291 Feb 15 2020
15880 17 Completed COS/FUV: G130M/1291 Feb 16 2020
15880 18 Failed COS/FUV: G130M/1309 Feb 17 2020
15880 23 Completed COS/FUV: G130M/1309 Apr 18 2020
LGGS J101102.38-044014.6 Sextans A LGN s089 SEXTANS-A-LGN-S089, STAR-J101102.38-044014.6 10h 11m 02.37s -04d 40m 14.68s B2.5 I 19.58 0.05 14245 COS/FUV Mar 06 2016 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
14245 09 Completed COS/FUV: G140L/1105 Mar 06 2016
14245 10 Completed COS/FUV: G140L/1105 Mar 06 2016
LGGS J101104.78-044224.1 Sextans A LGN s037 SEXTANS-A-LGN-S037, SA1 10h 11m 04.77s -04d 42m 24.24s O9 I 20.68 0.03 16767 COS/FUV Jan 24 2022 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16767 01 Completed COS/FUV: G130M/1291 Jan 24 2022
16767 02 Completed COS/FUV: G130M/1291 Jan 25 2022
16767 03 Completed COS/FUV: G160M/1600 Mar 13 2022
16767 04 Completed COS/FUV: G160M/1600 Mar 10 2022
16767 05 Completed COS/FUV: G160M/1600 Mar 12 2022
16767 06 Completed COS/FUV: G160M/1600 Mar 16 2022
16767 07 Completed COS/FUV: G160M/1600 Mar 16 2022
LGGS J101104.79-044220.9 Sextans A LGN s021 SEXTANS-A-LGN-S021, SA3 10h 11m 04.79s -04d 42m 20.96s O8 V 20.6 -0.2 16920 COS/FUV Jun 24 2022 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
16920 01 Completed COS/FUV: G130M/1291 Jun 24 2022
16920 02 Completed COS/FUV: G130M/1291 Jun 24 2022
16920 03 Completed COS/FUV: G160M/1600 Jun 27 2022
16920 04 Completed COS/FUV: G160M/1600 Jun 27 2022
16920 05 Completed COS/FUV: G160M/1600 Jun 27 2022
16920 06 Completed COS/FUV: G160M/1600 Jun 28 2022
[VPW98] 451 Sextans A LGN s022 SEXTANS-A-LGN-S022, SEXTANS-A-OB521, STAR-J101105.38-044240.1 10h 11m 05.38s -04d 42m 40.15s O8 V 19.46 0.01 14245, 15880 COS/FUV Mar 15 2016 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
14245 04 Completed COS/FUV: G140L/1105 Mar 15 2016
15880 12 Failed COS/FUV: G130M/1291/1309 Feb 19 2020
15880 13 Completed COS/FUV: G130M/1291/1309 Feb 20 2020
15880 22 Completed COS/FUV: G130M/1291 Apr 05 2020
LGGS J101106.05-044211.4 Sextans A LGN s038 SEXTANS-A-LGN-S038, SEXTANS-A-OB523, STAR-J101106.05-044211.4 10h 11m 06.04s -04d 42m 11.49s O9 I((f)) 19.49 0.03 14245, 15880 COS/FUV Mar 13 2016 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
14245 05 Completed COS/FUV: G140L/1105 Mar 13 2016
14245 06 Completed COS/FUV: G140L/1105 Mar 13 2016
15880 14 Completed COS/FUV: G130M/1291/1309 Feb 21 2020
15880 15 Completed COS/FUV: G130M/1291/1309 Feb 22 2020
[ECG2019] LP 26 Leo-P ECG LP 26 LEO-P-ECG-LP26, LEO-P 10h 21m 44.64s +18d 04m 58.23s O7-8 V 20.62 0.0 15967 COS/FUV Apr 11 2020 Completed
Proposal ID Visit ID Visit Status Science Configuration Observation Date
15967 07 Completed COS/FUV: G130M/1291 May 27 2020
15967 08 Completed COS/FUV: G130M/1291 Apr 18 2020
15967 09 Completed COS/FUV: G160M/1600 Apr 19 2020
15967 10 Completed COS/FUV: G160M/1600 Apr 19 2020
15967 11 Completed COS/FUV: G160M/1600 May 28 2020
15967 12 Completed COS/FUV: G160M/1600 Apr 11 2020

Table 3: ULLYSES Imaging

Simbad Resolvable Name ULLYSES Target Name APT Target Name RA(J2016) DEC(J2016) Proposal ID Science Configuration First Observation Date Overall Status
NGC3109 NGC3109 NGC3109, NGC-3109-V01, NGC-3109-V02 10h 03m 06.88s +26d 09m 34.46s 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
16104 02 Completed WFC3/UVIS: F225W + F275W + F336W + F475W + F814W Nov 03 2020
Sex A Sextans-A SEXTANS-A 10h 11m 00.50s -04d 41m 30.00s 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

Last Updated: Sep 14, 2023

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