Table 5
Coefficients Ak and selected Fourier parameters for the Fourier decomposition fit of the RR Lyrae variables in NGC 1904.
| # | A 0 | A 1 | A 2 | A 3 | A 4 | φ 21 | φ 31 | φ 41 | N | D m |
|
|
||||||||||
| RR0 | ||||||||||
| V3 | 16.049(1) | 0.330(1) | 0.165(1) | 0.107(1) | 0.057(1) | 4.222(9) | 8.680(14) | 6.805(19) | 6 | 2.2 |
| V4 | 16.111(1) | 0.408(1) | 0.195(1) | 0.134(1) | 0.062(1) | 4.031(5) | 8.318(8) | 6.599(13) | 7 | 7.0 |
| V5 | 15.724(1) | 0.224(2) | 0.114(2) | 0.085(1) | 0.052(1) | 4.115(23) | 8.535(28) | 6.466(32) | 6 | 3.5 |
| V10 | 15.027(1) | 0.102(1) | 0.073(1) | 0.018(1) | 0.019(1) | 4.045(16) | 8.644(35) | 6.543(37) | 5 | 3.7 |
| V13 | 16.061(1) | 0.273(1) | 0.132(1) | 0.075(1) | 0.020(1) | 4.317(15) | 8.825(22) | 7.290(49) | 4 | 2.3 |
|
|
||||||||||
| RR1 | ||||||||||
| V14 | 16.154(1) | 0.137(1) | 0.007(1) | 0.007(1) | 0.005(1) | 4.841(140) | 3.079(121) | 2.226(152) | 4 | − |
Notes. The number of fitted harmonics N is also given. Numbers in parentheses are the 1-σ uncertainties on the last decimal place. Note that A0 for V5 and V10 is too bright and A1,A2,A3 and A4 are underestimated because these two objects are significantly blended, so we exclude them from calculations in which this parameter is used to estimate the distance to the cluster. We also list the deviation parameter Dm defined by Jurcsik & Kovács (1996) to assess whether fit parameters can be used to derive properties of the RR Lyrae variables.
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