Table 1
Stellar targets used for the radiometric calibration of the UV channel.
| Star ID | Spectral type | U | V | Observation date | f* ± σf* (×103 phot cm−2 s−1) | ϵUV,* (DN/phot) |
|---|---|---|---|---|---|---|
| α Leonis (a,b) | B8IVn | 0.88 | 1.40 | 15 June 2020 | 31 ± 2 | 0.223 |
| ρ Leonis (b) | B1Iab | 2.78 | 3.87 | 17 June 2020 | 15.3 ± 1.1 | 0.220 |
| ν Scorpii (b) | B2V | 3.42 | 4.00 | 15 March 2021 | 8.9 ± 0.7 | 0.188 |
| β 01 Scorpii (b) | B1V | 1.68 | 2.62 | 15 March 2021 | 68 ± 15 | 0.197 |
| δ Scorpii (a) | B0.3IV | 1.30 | 2.32 | 15 March 2021 | 119 ± 7 | 0.219 |
| ω Scorpii (b) | B1V | 3.10 | 3.97 | 15 March 2021 | 16.3 ± 1.3 | 0.179 |
| λ Librae (b) | B3V | 4.43 | 5.03 | 15 March 2021 | 3.5 ± 0.3 | 0.210 |
| θ Ophiuchi (b) | OB | 2.18 | 3.26 | 25 March 2021 | 48 ± 13 | 0.246 |
| σ Sagittarii (a) | B2V | 1.06 | 2.07 | 09 April 2021 | 126 ± 7 | 0.189 |
| τ Tauri (b) | B3V | N.A. | 4.26 | 24 August 2021 | 9 ± 2 | 0.169 |
| 121 Tauri (b) | B2.5IV | 4.67 | 5.38 | 28 August 2021 | 3.4 ± 1.2 | 0.145 |
Notes. (a)SPICAM. (b)IUE. The Johnson–Cousins U, V apparent magnitudes of the target stars are listed in the third and fourth columns. Starting date of the target observations is in the fifth column. Values of the UV H I Ly-α flux f* and its uncertainty σf* (in photons cm−2 s−1) are in the sixth column (see Sect. 2.5). Values of the radiometric calibration factor for every star (weighted average, in DN/photon) are in the last column (see Sect. 2.8). Reported information is taken from the SIMBAD catalog, with the exceptions of the last three columns.
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