Table 10
NGC 6638: details of the 8 new variables found in the cluster.
| Var | RA (J2000.0) | Dec (J2000.0) | Epoch (d) | P (d) | ⟨ I ⟩ | A i′ + z′ | Blend | Classification | |
|
|
|||||||||
| V64 | 18:30:56.321 | –25:30:03.74 | 6541.5840 | 0.24833 | 16.14 | 0.20 | iii | RR1 | |
| V65 | 18:30:55.591 | –25:29:43.63 | 6458.8425 | 0.36820 | 15.85 | 0.28 | iii | RR1 | |
| V66 | 18:30:55.015 | –25:29:47.10 | 6783.8751 | 0.64016 | 15.78 | 0.24 | iii | RR0 | |
| V67 | 18:30:56.836 | –25:29:46.75 | 6783.8751 | 0.64141 | 15.67 | 0.13 | iii | RR0 | |
| V68 | 18:30:56.237 | –25:30:04.37 | 6797.8372 | 0.83290 | 15.97 | 0.87 | i | RR0 | |
| V69 | 18:30:54.834 | –25:30:01.50 | 6516.5499 | 38.8 | 12.30 | 0.22 | iii | SR | |
| V70 | 18:30:55.820 | –25:30:00.95 | 6486.7350 | 80.2 | 11.77 | 0.45 | iii | SR | |
| V71 | 18:30:56.005 | –25:29:57.29 | – | – | 11.92 | 0.10 | iii | L | |
Notes. The celestial coordinates correspond to the epoch of the reference image, which is the HJD ~ 2 456 511.65 d. Epochs are (HJD – 2 450 000). ⟨ I ⟩ denotes mean I magnitude and Ai′ + z′ are the amplitudes found in our special i′ + z′ filter. The blend column describes whether the star is blended with (i) brighter star(s); (ii) star(s) of similar magnitude; or (iii) fainter/no star(s).
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