MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.32 | 15.89± 0.04 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.15 | -- | - | - | -- | - | - | 15.36± 0.03 | T | -- | - | - | |
56490.37 | 15.90± 0.04 | - | 16.83± 0.05 | - | -- | - | - | -- | - | - | ||
56536.24 | 15.88± 0.04 | - | -- | - | - | 15.34± 0.04 | - | -- | - | - | ||
56915.13 | 15.88± 0.03 | - | 16.82± 0.04 | - | 15.36± 0.04 | - | -- | - | - | |||
57227.31 | 15.86± 0.04 | - | 16.80± 0.04 | - | 15.32± 0.04 | - | -- | - | - | |||
57310.08 | 15.88± 0.03 | - | -- | - | - | -- | - | - | 14.84± 0.05 | - | ||
57633.35 | 15.95± 0.04 | - | 16.90± 0.05 | - | 15.43± 0.05 | - | -- | - | - | |||
57638.29 | 15.91± 0.04 | - | -- | - | - | -- | - | - | 14.89± 0.05 | - | ||
57958.29 | 15.89± 0.03 | - | 16.81± 0.04 | - | -- | - | - | 14.82± 0.04 | - | |||
58043.06 | 15.87± 0.03 | - | 16.79± 0.04 | - | -- | - | - | 14.80± 0.05 | - | |||
58098.09 | 15.88± 0.04 | - | 16.80± 0.04 | - | 15.35± 0.03 | A | -- | - | - | |||
58312.29 | 15.90± 0.04 | - | 16.80± 0.04 | - | 15.34± 0.04 | - | -- | - | - | |||
58316.26 | 15.91± 0.04 | - | -- | - | - | -- | - | - | 14.85± 0.04 | - | ||
58341.23 | 15.88± 0.05 | - | 16.78± 0.05 | - | -- | - | - | -- | - | - | ||
58366.12 | 15.87± 0.03 | - | 16.77± 0.04 | - | -- | - | - | -- | - | - | ||
58375.12 | 15.87± 0.03 | - | -- | - | - | 15.32± 0.03 | - | -- | - | - | ||
58403.08 | 15.88± 0.03 | - | -- | - | - | -- | - | - | 14.85± 0.05 | - | ||
58671.38 | 15.93± 0.04 | - | 16.83± 0.03 | - | -- | - | - | -- | - | - | ||
58695.34 | 15.92± 0.04 | - | -- | - | - | 15.40± 0.04 | - | 14.88± 0.04 | - | |||
58750.13 | 15.91± 0.04 | - | 16.82± 0.03 | - | -- | - | - | -- | - | - | ||
58779.10 | 15.90± 0.04 | - | -- | - | - | 15.37± 0.03 | - | -- | - | - | ||
58812.08 | 15.92± 0.04 | - | -- | - | - | -- | - | - | 14.87± 0.04 | - | ||
59001.39 | 15.88± 0.03 | - | -- | - | - | 15.35± 0.04 | - | -- | - | - | ||
59059.31 | 15.88± 0.03 | - | 16.82± 0.03 | - | 15.35± 0.04 | - | -- | - | - | |||
59081.22 | 15.86± 0.03 | - | -- | - | - | -- | - | - | 14.83± 0.05 | - | ||
59136.11 | 15.87± 0.03 | - | 16.82± 0.03 | - | 15.35± 0.03 | - | -- | - | - | |||
59166.25 | 15.86± 0.03 | - | -- | - | - | -- | - | - | 14.82± 0.05 | - | ||
59380.36 | 15.88± 0.03 | - | -- | - | - | 15.36± 0.04 | - | -- | - | - | ||
59415.34 | 15.87± 0.03 | - | 16.81± 0.04 | - | -- | - | - | -- | - | - | ||
59442.32 | 15.89± 0.03 | - | -- | - | - | 15.36± 0.04 | - | 14.83± 0.05 | - | |||
59485.12 | 15.88± 0.03 | - | 16.81± 0.03 | - | -- | - | - | -- | - | - | ||
59525.06 | 15.86± 0.03 | - | -- | - | - | -- | - | - | 14.82± 0.05 | T | ||
59551.04 | 15.89± 0.03 | - | 16.83± 0.03 | T | 15.35± 0.04 | - | -- | - | - | |||
59753.36 | 15.88± 0.03 | - | 16.80± 0.04 | - | -- | - | - | -- | - | - | ||
59816.21 | 15.90± 0.03 | T | -- | - | - | -- | - | - | -- | - | - | |
59823.21 | 15.85± 0.04 | - | -- | - | - | 15.32± 0.04 | - | -- | - | - | ||
59848.13 | 15.87± 0.03 | - | -- | - | - | -- | - | - | 14.85± 0.05 | - | ||
59903.15 | 15.87± 0.02 | - | 16.79± 0.03 | - | 15.33± 0.03 | - | -- | - | - |
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 [0.12 mag] | B [0.10 mag] | R [0.11 mag] | |
---|---|---|---|
B [0.12 mag] | 0.64 (19) | ||
R [0.11 mag] | 0.86 (17) | 0.95 (9) | |
I [0.08 mag] | 0.65 (13) | -.-- (2) | -.-- (2) |
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) | 0.29 | 1.00 | ||
R (I|R) | 0.36 | 0.84 | 0.81 | 0.01 | |
I (I|R) | 0.25 | 1.23 | --- | --- | --- | ---- |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5