MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.34 | 17.45± 0.05 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.16 | -- | - | - | -- | - | - | 16.74± 0.04 | T | -- | - | - | |
56537.17 | 17.07± 0.03 | - | 17.99± 0.04 | - | 16.71± 0.03 | - | -- | - | - | |||
57633.38 | 17.61± 0.04 | - | 18.06± 0.05 | - | 16.89± 0.04 | - | -- | - | - | |||
57638.25 | 17.05± 0.04 | - | -- | - | - | -- | - | - | 16.27± 0.07 | - | ||
57888.07 | 17.08± 0.07 | - | 18.17± 0.23 | X | 16.92± 0.08 | - | -- | - | - | |||
57958.40 | 17.04± 0.04 | - | -- | - | - | -- | - | - | 16.29± 0.06 | - | ||
57963.41 | 17.16± 0.04 | - | 17.50± 0.06 | - | 16.70± 0.05 | - | -- | - | - | |||
57988.26 | 17.09± 0.04 | - | 17.94± 0.04 | - | 17.05± 0.04 | - | -- | - | - | |||
58067.16 | 17.20± 0.04 | - | -- | - | - | -- | - | - | 16.31± 0.06 | - | ||
58098.14 | 17.11± 0.04 | - | 17.74± 0.04 | - | -- | - | - | -- | - | - | ||
58317.28 | 17.41± 0.04 | - | 18.17± 0.05 | - | 17.15± 0.05 | - | -- | - | - | |||
58339.27 | 17.41± 0.04 | - | -- | - | - | -- | - | - | 16.48± 0.08 | - | ||
58342.27 | 17.03± 0.04 | - | 17.65± 0.04 | - | -- | - | - | -- | - | - | ||
58373.09 | 17.53± 0.05 | - | 18.12± 0.06 | - | -- | - | - | -- | - | - | ||
58671.35 | 17.34± 0.03 | A | 17.79± 0.04 | - | 16.73± 0.04 | - | -- | - | - | |||
58695.41 | 17.17± 0.03 | - | -- | - | - | 16.81± 0.04 | - | -- | - | - | ||
58750.11 | 17.01± 0.03 | - | -- | - | - | -- | - | - | 16.20± 0.05 | - | ||
58779.03 | 17.07± 0.03 | - | 17.68± 0.03 | - | -- | - | - | -- | - | - | ||
58812.16 | 17.12± 0.03 | - | -- | - | - | 16.63± 0.03 | - | -- | - | - | ||
59000.37 | 17.13± 0.06 | - | -- | - | - | 16.80± 0.05 | - | -- | - | - | ||
59055.29 | 17.44± 0.06 | - | 17.89± 0.07 | - | -- | - | - | -- | - | - | ||
59077.25 | 17.39± 0.07 | - | -- | - | - | 17.08± 0.05 | - | 16.63± 0.06 | - | |||
59131.11 | 17.07± 0.05 | - | 17.62± 0.05 | - | -- | - | - | -- | - | - | ||
59166.14 | 17.01± 0.05 | - | -- | - | - | -- | - | - | 16.18± 0.06 | - | ||
59194.12 | 16.99± 0.03 | - | -- | - | - | 16.55± 0.05 | - | -- | - | - | ||
59376.38 | 17.24± 0.07 | - | 17.77± 0.08 | - | -- | - | - | -- | - | - | ||
59409.33 | 17.21± 0.08 | A | -- | - | - | 16.69± 0.06 | - | -- | - | - | ||
59442.36 | 16.96± 0.06 | - | 17.56± 0.07 | - | -- | - | - | 16.21± 0.05 | - | |||
59467.13 | 16.95± 0.07 | - | -- | - | - | 16.58± 0.03 | - | -- | - | - | ||
59522.10 | 17.12± 0.04 | - | 17.63± 0.06 | - | -- | - | - | -- | - | - | ||
59546.13 | 17.05± 0.04 | - | -- | - | - | -- | - | - | 16.23± 0.06 | - | ||
59548.02 | 17.23± 0.05 | - | 17.91± 0.07 | - | -- | - | - | 16.65± 0.07 | - | |||
59583.12 | 17.05± 0.05 | - | -- | - | - | 16.60± 0.04 | - | -- | - | - | ||
59739.38 | 17.01± 0.06 | - | 17.57± 0.07 | - | 16.52± 0.05 | - | -- | - | - | |||
59759.35 | 17.15± 0.05 | - | 17.78± 0.08 | - | 16.68± 0.04 | - | -- | - | - | |||
59794.23 | 17.24± 0.05 | T | -- | - | - | -- | - | - | -- | - | - | |
59816.16 | 17.24± 0.06 | - | -- | - | - | 16.96± 0.04 | - | -- | - | - | ||
59848.09 | 17.05± 0.04 | - | -- | - | - | -- | - | - | 16.25± 0.05 | - | ||
59849.06 | 17.60± 0.07 | - | 18.38± 0.09 | - | -- | - | - | -- | - | - | ||
59879.05 | 17.50± 0.05 | - | 18.10± 0.07 | - | -- | - | - | -- | - | - | ||
59903.12 | 17.12± 0.04 | - | -- | - | - | 16.76± 0.05 | - | 16.44± 0.07 | - | |||
59905.10 | 17.00± 0.03 | - | -- | - | - | 16.58± 0.03 | - | 16.22± 0.04 | - |
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 [0.88 mag] | B [0.66 mag] | R [0.63 mag] | |
---|---|---|---|
B [0.88 mag] | 0.65 (20) | ||
R [0.63 mag] | 0.40 (20) | 0.60 (8) | |
I [0.47 mag] | 0.72 (13) | -.-- (2) | 0.96 (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) | 12.54 | 0.96 | ||
R (I|R) | 9.35 | 0.80 | 16.14 | 0.14 | |
I (I|R) | 6.12 | 1.19 | --- | --- | --- | ---- |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5