Table 9
NGC 6638: details of the 8 previously known variables in our FoV.
| Var | RA (J2000.0) | Dec (J2000.0) | Epoch (d) | P (d) | ⟨ I ⟩ | Ai′ + z′ | Blend | Classification |
|
|
||||||||
| V25 | 18:30:55.564 | –25:30:04.05 | 6511.6617 | 0.67276 | 15.79 | 0.66 | iii | RR0 |
| V26 | 18:30:55.635 | –25:30:08.79 | 6782.8404 | 0.66743 | 15.85 | 0.47 | iii | RR0 |
| V27 | 18:30:55.912 | –25:30:09.31 | 6773.8921 | 0.59969 | 15.87 | 0.68 | iii | RR0 |
| V29 | 18:30:56.111 | –25:29:53.87 | 6773.8921 | 0.257893 | 15.92 | 0.31 | iii | RR1 |
| V30 | 18:30:56.471 | –25:30:07.56 | 6458.6160 | 0.50650 | 16.00 | 0.75 | iii | RR0 |
| V31 | 18:30:56.640 | –25:29:59.47 | 6783.8751 | 0.45795 | 15.88 | 0.67 | iii | RR0 |
| V32 | 18:30:56.570 | –25:29:49.75 | 6773.8921 | 0.56830 | 15.65 | 0.35 | iii | RR0 |
| V33 | 18:30:56.914 | –25:30:10.79 | 6791.7951 | 0.32378 | 16.07 | 0.22 | iii | RR1 |
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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