Table 3
Data for all confirmed variable stars in NGC 1904.
| # | Epoch | P | P (Amigo | P (Rosino | ⟨ V ⟩ | ⟨ I ⟩ | Amplitude | Amplitude | Type |
| (HJD-2 450 000) | (d) | et al. 2011) (d) | 1952) (d) | (V mag) | (I mag) | ||||
|
|
|||||||||
| V3 | 5220.2906 | 0.736051 | 0.7350907 | 0.73602 | 16.05 | 15.47 | 0.93 | 0.62 | RR0 |
| V4 | 5633.0762 | 0.633806 | 0.6341531 | 0.63492 | 16.11 | 15.57 | 1.01 | 0.54 | RR0 |
| V5 | 5634.1150 | 0.668918 | 0.6683208 | − | 15.72 | 15.43 | 0.61 | 0.47 | RR0 |
| V6 | 5634.1450 | 0.347110 | 0.3387880 | 0.33522 | 16.16 | 15.80 | 0.52 | 0.42 | RR1 |
| V7 | − | − | − | 13.65b | 12.90b | ~0.70 | ~0.54 | Long-term | |
| V9 | 5634.1150 | 0.359830 | 0.3616000 | − | 16.07b | 15.63b | 0.36 | 0.21 | RR1a |
| V10 | 5220.3042 | 0.728755 | 0.7279145 | − | 15.03 | 14.46 | 0.34 | 0.25 | RR0 |
| V11 | 5634.1295 | 0.823500 | 0.8199846 | − | 16.01b | 15.31b | 0.51 | 0.51 | RR0 |
| V12 | 5634.1559 | 0.324243 | 0.3234196 | − | 16.11b | − | 0.64 | 0.64 | RR1 |
| V13 | 5633.0762 | 0.689388 | 0.6906617 | − | 16.06 | − | 0.92 | ~1.50 | RR0 |
| V14 | 5633.0825 | 0.323733 | − | − | 16.15 | 15.78 | 0.28 | 0.26 | RR1 |
Notes. Periods are determined using phase dispersion minimisation (PDM) and the string length method (see text). ⟨V⟩ and ⟨I⟩ are intensity-weighted mean magnitudes.
Error-weighted mean magnitudes, rather than intensity-weighted magnitudes. Coordinates for all confirmed variables are given in Table 4.
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