Table 1
X-ray-detected Wolf–Rayet stars in Wd1.
| Name | ID | Other | RA | Dec | Net counts | Spectral type | Info | P | P (this work) |
|---|---|---|---|---|---|---|---|---|---|
| names | h m s | ° ′ ″ | days | days | |||||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
| A | 3972 | WR77sc, W72 | 16:47:08.35 | −45:50:45.4 | 10295 ± 102 (l) | WN7b | earlyBIa | 7.63(a) | 81.75 ± 4.63 |
| 5412.8±74.3 (s) | 7.70 ± 0.04 | ||||||||
| B | 3299 | WR77o | 16:47:05.36 | −15:51:04.8 | 3046.2±55.9 | WN7o | SB1 | 3.52(b) | 3.514±0.009 |
| 2.222 ± 0.004 | |||||||||
| U | 3577 | WR77s, #1(c) | 16:47:06.53 | −45:50:39.1 | 1996.9±45.2 | WN6o | − | ||
| L | 3012 | WR77k, W44 | 16:47:04.19 | −45:51:07.2 | 1221.9±35.5 | WN9h | binary | 53.95(d) | 46.41±1.38 |
| F | 3252 | WR77n, W239 | 16:47:05.20 | −45:52:25.0 | 903.3±30.3 | WC9d | SB1 | 5.05(e) | 2.263 ± 0.004 |
| 5.15 ± 0.02 | |||||||||
| O | 3830 | WR77sb | 16:47:07.65 | −45:52:36.0 | 387.7±20.0 | WN6o | − | ||
| N | 2015 | WR77b | 16:46:59.91 | −45:55:25.6 | 375.2±20.0 | WC9d | SB2?, O? | 58.61 ± 2.79 | |
| W | 3815 | WR77sa, #3(c) | 16:47:07.61 | −45:49:22.1 | 243.1±16.0 | WN6h | − | ||
| J | 2579 | WR77e | 16:47:02.47 | −45:50:59.9 | 233.5±16.0 | WN5h | 5.15±0.02 (u) | ||
| R | 3488 | WR77q, W14c | 16:47:06.09 | −45:50:22.4 | 192.9±14.8 | WN5o | − | ||
| X | 4798 | WR77sd,#2(c) | 16:47:14.13 | −45:48:32.0 | 154.2±13.0 | WN5o | 9.01 ± 0.05 (u) | ||
| G | 2967 | WR77j, W39b | 16:47:04.00 | −45:51:25.1 | 146.8±13.0 | WN7o | − | ||
| P | 2381 | WR77d, W57c | 16:47:01.59 | −45:51:45.2 | 88.9±10.0 | WN7o | 5.19 ± 0.01 | ||
| I | 2198 | WR77c | 16:47:00.87 | −45:51:20.6 | 86.6±10.0 | WN8o | − | ||
| Q | 1416 | WR77a | 16:46:55.54 | −45:51:34.5 | 86.5±9.7 | WN6o | 7.4 ± 0.04 (u) | ||
| D | 3523 | WR77r | 16:47:06.25 | −45:51:26.4 | 69.3±9.5 | WN7o | − | ||
| V | 2918 | WR77h | 16:47:03.79 | −45:50:38.7 | 66.8±9.0 | WN8o | − | ||
| E | 3445 | WR77p, W241 | 16:47:05.96 | −45:52:08.3 | 56.3±8.0 | WC9 (f) | RVbinary? | − | |
| H | 3019 | WR77l | 16:47:04.23 | −45:51:20.2 | 26.3±7.3 | WC9d | − | ||
| S | 2708 | WR77f, W5 | 16:47:02.98 | −45:50:18.5 | 23.7±5.8 | WN10-11h/B0.5Ia+ | − |
Notes. Column 1 reports the most common names for the WR stars in Wd1. Column 2 reports the EWOCS catalogue source identification number (Guarcello et al. 2024). Column 3 reports other WR names used in the literature. Columns 4 and 5 report the coordinates obtained from the X-ray source detection. Column 6 reports the net counts in the broad band (0.5–8.0 keV) and the corresponding errors adopted from Guarcello et al. (2024). For star A we also report the net counts corresponding to the large extraction region noted with (l). Column 7 presents the WR spectral type originally reported in Crowther et al. (2006a) unless otherwise indicated. Column 8 presents some information on source binarity and companion properties adopted by Crowther et al. (2006a), Clark et al. (2020), and Ritchie et al. (2022). Columns 9 and 10 report the measured periods from other and this work, respectively. For the cases where we detect two periods for the same source, both are reported in order of highest significance. The letter (u) signifies that the measured period is uncertain (a detailed description is provided in Sec. 3.3). (a)Bonanos (2007) (b)Koumpia & Bonanos (2012) (c)as reported in Groh et al. (2006)(d)Ritchie et al. (2022) (e)Clark et al. (2011) (f)Clark & Negueruela (2002).
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