MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56599.11 | 16.98± 0.03 | - | 17.69± 0.10 | - | 16.45± 0.04 | - | -- | - | - | |||
56930.14 | 17.02± 0.03 | - | 17.94± 0.04 | - | 16.43± 0.04 | - | -- | - | - | |||
57285.24 | 17.09± 0.05 | - | 18.01± 0.04 | - | 16.49± 0.05 | - | -- | - | - | |||
57340.19 | 17.05± 0.06 | - | -- | - | - | -- | - | - | 16.00± 0.08 | - | ||
57635.27 | 17.03± 0.04 | - | 18.02± 0.04 | - | 16.49± 0.04 | - | 15.97± 0.04 | - | ||||
57743.06 | 17.02± 0.03 | - | 18.01± 0.04 | - | 16.47± 0.03 | - | 15.97± 0.04 | - | ||||
57958.40 | 17.07± 0.04 | - | -- | - | - | -- | - | - | 16.07± 0.06 | - | ||
57963.37 | 17.12± 0.05 | A | 18.10± 0.07 | A | 16.51± 0.05 | - | 16.09± 0.07 | - | ||||
57988.26 | 17.07± 0.04 | - | 18.10± 0.04 | - | 16.53± 0.04 | - | -- | - | - | |||
58035.05 | 17.05± 0.06 | - | -- | - | - | 16.46± 0.06 | - | -- | - | - | ||
58067.16 | 17.11± 0.04 | - | -- | - | - | -- | - | - | 16.08± 0.06 | - | ||
58073.10 | 17.19± 0.06 | - | 18.21± 0.06 | - | -- | - | - | -- | - | - | ||
58098.15 | 17.15± 0.04 | A | 18.11± 0.04 | - | 16.60± 0.05 | - | 16.10± 0.07 | - | ||||
58312.37 | 17.09± 0.06 | - | 18.09± 0.08 | - | -- | - | - | -- | - | - | ||
58317.28 | 17.07± 0.04 | - | 18.00± 0.04 | - | 16.49± 0.05 | - | -- | - | - | |||
58339.29 | 17.12± 0.05 | A | -- | - | - | 16.59± 0.06 | - | 16.02± 0.07 | A | |||
58342.28 | 17.10± 0.05 | A | 18.06± 0.06 | A | -- | - | - | -- | - | - | ||
58373.10 | 17.09± 0.05 | A | 18.05± 0.06 | A | -- | - | - | -- | - | - | ||
58673.32 | 17.06± 0.02 | - | 18.04± 0.04 | - | -- | - | - | -- | - | - | ||
58750.16 | 17.03± 0.03 | - | -- | - | - | 16.47± 0.04 | - | 16.01± 0.06 | - | |||
58784.10 | 17.03± 0.02 | - | 18.01± 0.04 | - | -- | - | - | -- | - | - | ||
58836.15 | 17.07± 0.04 | - | -- | - | - | 16.51± 0.04 | - | 16.03± 0.06 | - | |||
59026.38 | 16.99± 0.03 | - | 17.95± 0.07 | - | 16.45± 0.04 | - | -- | - | - | |||
59056.27 | 16.98± 0.05 | - | 17.96± 0.07 | - | -- | - | - | 15.95± 0.07 | - | |||
59077.27 | 17.00± 0.05 | - | -- | - | - | 16.45± 0.05 | - | 15.91± 0.07 | - | |||
59082.24 | 16.96± 0.05 | - | 17.96± 0.07 | - | -- | - | - | -- | - | - | ||
59136.06 | 16.99± 0.04 | - | -- | - | - | 16.45± 0.04 | - | -- | - | - | ||
59166.16 | 16.98± 0.05 | - | -- | - | - | -- | - | - | 15.91± 0.07 | - | ||
59382.34 | 16.98± 0.06 | - | 17.89± 0.09 | - | -- | - | - | -- | - | - | ||
59441.28 | 17.00± 0.05 | - | -- | - | - | 16.45± 0.04 | - | -- | - | - | ||
59463.24 | 17.00± 0.05 | - | 18.01± 0.06 | - | -- | - | - | 15.95± 0.06 | - | |||
59523.12 | 17.03± 0.04 | - | -- | - | - | 16.46± 0.04 | - | -- | - | - | ||
59548.02 | 17.00± 0.05 | - | 17.94± 0.07 | - | -- | - | - | 15.88± 0.06 | - | |||
59759.35 | 17.00± 0.05 | - | 17.93± 0.09 | - | 16.45± 0.04 | - | -- | - | - | |||
59794.23 | 17.02± 0.05 | - | -- | - | - | -- | - | - | 15.91± 0.07 | - | ||
59849.06 | 16.96± 0.06 | - | 17.92± 0.09 | - | -- | - | - | -- | - | - | ||
59903.12 | 16.94± 0.04 | - | -- | - | - | 16.41± 0.05 | - | 15.91± 0.07 | - |
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 [0.51 mag] | B [0.25 mag] | R [0.19 mag] | |
---|---|---|---|
B [0.51 mag] | 0.65 (23) | ||
R [0.19 mag] | 0.81 (20) | 0.45 (11) | |
I [0.22 mag] | 0.80 (17) | 0.92 (7) | 0.63 (9) |
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) | 1.57 | 0.96 | ||
R (I|R) | 1.06 | 1.29 | 12.60 | 0.03 | |
I (I|R) | 1.20 | 1.14 | 1.20 | 1.01 | 0.95 | 1.08 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5