Table 1.
Details about the telescopes and instruments used.
| Telescope | C1 | C2 | F | G | H | I |
|---|---|---|---|---|---|---|
| 2.0 m RC | 2.0 m RC | 1.3 m RC | 1.0 m RC | 60 cm RC | 50 cm Cassegrain | |
| CCD model | VersArray:1300B | iKon-L | 2k × 4k UKATC | SI 1100 Cryo | Andor iKon-L | Apogee Alta |
| UV, AR, BI | 936 BEX2-DD | U42 | ||||
| Chip size | 1340 × 1300 px | 2048 × 2048 px | 2048 × 4096 px | 4096 × 4096 px | 2048 × 2048 px | 2048 × 2048 px |
| Pixel size | 20 × 20 μm | 13.5 × 13.5 μm | 13 × 13 μm | 15 × 15 μm | 13.5 × 13.5 μm | 13 × 13 μm |
| Scale |
 px−1 |
 px−1 |
 px−1 |
 px−1 |
 px−1 |
 px−1 |
| Field |
 |
17′ × 17′ | 10′ × 20′ |
 |
 |
 |
| Gain | 1.0 e− ADU−1 | 1.0/1.1 e− ADU−1 | 0.74 e− ADU−1 | 0.57 e− ADU−1 | 1.1 e− ADU−1 | 1.28 e− ADU−1 |
| Read out noise | 2.0 e− rms | 6.7/6.9 e− rms | 4.2 e− rms | 4.19 e− rms | 6.9 e− rms | 8.3 e− rms |
| Binning used | 1 × 1 | 1 × 1 | 1 × 1 | 2 × 2 | 1 × 1 | 2 × 2 |
| Typical seeing | 1 5 to 2 5 |
1 5 to 2 5 |
1″ to 3″ | 1″ to 3″ | 1 5 to 3″ |
2″ to 3″ |
Notes. Configuration C1: 2.0 m RC telescope at Rozhen NAO, Bulgaria. Configuration C2: 2.0 m RC telescope + FoReRo-2 focal reducer at Rozhen NAO. The gain and read-out noise are reported for the blue and red channels, respectively. Telescope F: 1.3 m JC Bhattacharya telescope (JCBT), Kavalur, India. Telescope G: 1.0 m RC telescope, Turkey. Telescope H: 60 cm RC robotic telescope, Turkey. Telescope I: 50 cm Cassegrain telescope, Krakow, Poland.
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