MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56604.11 | 16.99± 0.03 | - | 17.43± 0.04 | - | 16.71± 0.05 | - | -- | - | - | |||
56930.16 | 17.00± 0.03 | - | 17.43± 0.04 | - | 16.72± 0.04 | - | -- | - | - | |||
56951.10 | 17.03± 0.04 | - | 17.46± 0.03 | - | 16.73± 0.05 | - | -- | - | - | |||
57307.14 | 17.06± 0.04 | A | 17.53± 0.04 | A | 16.73± 0.04 | A | -- | - | - | |||
57340.22 | 16.94± 0.06 | - | -- | - | - | -- | - | - | 16.37± 0.08 | - | ||
57635.32 | 17.04± 0.03 | - | 17.45± 0.04 | - | 16.76± 0.04 | - | 16.43± 0.05 | - | ||||
57963.35 | 16.95± 0.04 | - | 17.39± 0.03 | - | -- | - | - | 16.34± 0.07 | - | |||
58035.07 | 16.93± 0.06 | - | -- | - | - | 16.67± 0.07 | - | -- | - | - | ||
58077.14 | 17.00± 0.04 | - | 17.42± 0.03 | - | -- | - | - | 16.39± 0.07 | - | |||
58317.33 | 16.96± 0.04 | - | -- | - | - | -- | - | - | 16.42± 0.07 | - | ||
58339.32 | 17.00± 0.04 | - | 17.43± 0.04 | - | 16.70± 0.05 | - | -- | - | - | |||
58373.13 | 16.98± 0.04 | - | 17.37± 0.05 | - | -- | - | - | -- | - | - | ||
58672.36 | 16.91± 0.04 | - | -- | - | - | 16.68± 0.04 | - | 16.36± 0.05 | - | |||
58695.27 | 16.95± 0.03 | - | 17.40± 0.04 | - | -- | - | - | -- | - | - | ||
58779.11 | 16.99± 0.03 | - | -- | - | - | 16.70± 0.03 | - | -- | - | - | ||
59019.39 | 16.96± 0.03 | - | 17.38± 0.07 | - | -- | - | - | -- | - | - | ||
59059.26 | 16.99± 0.03 | - | 17.43± 0.03 | - | 16.70± 0.04 | - | -- | - | - | |||
59081.20 | 16.98± 0.04 | - | -- | - | - | -- | - | - | 16.35± 0.07 | - | ||
59131.16 | 16.97± 0.04 | - | 17.38± 0.04 | - | -- | - | - | -- | - | - | ||
59166.23 | 16.98± 0.03 | - | -- | - | - | -- | - | - | 16.40± 0.07 | - | ||
59194.18 | 16.91± 0.04 | - | -- | - | - | 16.63± 0.04 | - | -- | - | - | ||
59380.38 | 16.94± 0.06 | - | -- | - | - | 16.64± 0.06 | - | -- | - | - | ||
59441.35 | 17.00± 0.03 | - | 17.44± 0.03 | - | -- | - | - | -- | - | - | ||
59463.12 | 16.95± 0.03 | - | -- | - | - | -- | - | - | 16.39± 0.06 | - | ||
59483.13 | 16.92± 0.03 | - | -- | - | - | 16.63± 0.04 | - | -- | - | - | ||
59523.06 | 16.96± 0.04 | - | 17.43± 0.04 | - | -- | - | - | -- | - | - | ||
59548.11 | 16.97± 0.04 | - | -- | - | - | 16.66± 0.04 | - | 16.38± 0.06 | - | |||
59759.37 | 16.91± 0.05 | - | 17.35± 0.05 | - | 16.61± 0.05 | - | -- | - | - | |||
59794.29 | 17.00± 0.03 | - | -- | - | - | -- | - | - | 16.37± 0.06 | - | ||
59849.14 | 16.91± 0.03 | - | -- | - | - | -- | - | - | 16.43± 0.06 | - | ||
59903.06 | 17.02± 0.03 | - | 17.51± 0.03 | - | 16.71± 0.04 | - | -- | - | - | |||
59932.07 | 16.94± 0.03 | - | -- | - | - | -- | - | - | 16.26± 0.06 | - |
If the brightness variation is true variability then there should be a correlation between brightness changes recorded in different filter bands. The following table are the R-squared linear correlation factors calculated for the pairs of bands. The number in parentheses next to the R-squared value is the number of elements used to calculate the correlation factor. The number in square brackets next to the band is the range of magnitudes measured.
V [0.18 mag] | B [0.15 mag] | R [0.15 mag] | |
---|---|---|---|
B [0.18 mag] | 0.73 (17) | ||
R [0.15 mag] | 0.81 (16) | 0.49 (9) | |
I [0.17 mag] | 0.10 (13) | 1.00 (3) | 0.78 (3) |
The plots below are provided to check the values in the table above and also to show any non-linear correlations
Welch & Stetson (1993, AJ, 105, 1813) present a method for varible star detection in CCD images from automated surveys. Data from two bands are compared and two statistics are calculated: R and I.
The I-statistic has an expectation value of zero for stars that are NOT variable. A larger non-zero I-value indicates a higher likelihood that the star is variable. The R statistic indicates how the color of the star changes as the variable grows brighter with R = 1.0 being no change in color.
R and I values have only been calculated if there are more than four (4) matched measurements of brightness in each band.
V (I|R) | B (I|R) | R (I|R) | |
---|---|---|---|
B (I|R) | 0.94 | 1.14 | ||
R (I|R) | 1.11 | 1.37 | 1.55 | 0.06 | |
I (I|R) | 0.21 | 1.61 | --- | --- | --- | ---- |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5