MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56537.24 | 18.66± 0.05 | - | -- | - | - | 18.22± 0.07 | - | -- | - | - | ||
56593.10 | 18.71± 0.06 | - | -- | - | - | 18.19± 0.06 | - | -- | - | - | ||
56951.07 | 18.52± 0.07 | - | 18.86± 0.06 | - | 17.85± 0.06 | - | -- | - | - | |||
56982.20 | 18.46± 0.06 | - | 18.81± 0.05 | - | -- | - | - | -- | - | - | ||
57036.13 | 18.56± 0.09 | - | 18.78± 0.08 | - | -- | - | - | -- | - | - | ||
57309.14 | 18.34± 0.06 | - | 18.86± 0.05 | - | 17.68± 0.06 | - | -- | - | - | |||
57958.32 | 18.24± 0.07 | - | 18.65± 0.11 | - | -- | - | - | 16.56± 0.07 | - | |||
57963.28 | 18.24± 0.06 | - | 18.77± 0.07 | - | 17.50± 0.06 | - | -- | - | - | |||
58045.07 | 18.24± 0.05 | - | 18.64± 0.10 | - | 17.50± 0.06 | - | -- | - | - | |||
58067.12 | 18.17± 0.06 | - | -- | - | - | -- | - | - | 16.51± 0.07 | - | ||
58098.12 | 18.23± 0.07 | - | 18.75± 0.06 | - | -- | - | - | -- | - | - | ||
58312.32 | 18.28± 0.06 | - | 18.78± 0.06 | - | 17.53± 0.06 | - | -- | - | - | |||
58316.28 | 18.25± 0.05 | - | -- | - | - | -- | - | - | 16.56± 0.06 | - | ||
58341.25 | 18.27± 0.06 | - | 18.75± 0.08 | - | -- | - | - | -- | - | - | ||
58366.14 | 18.23± 0.05 | - | 18.89± 0.06 | - | -- | - | - | -- | - | - | ||
58372.12 | 18.16± 0.05 | - | -- | - | - | -- | - | - | 16.57± 0.06 | - | ||
58403.12 | 18.29± 0.06 | - | -- | - | - | 17.54± 0.06 | - | -- | - | - | ||
58420.03 | 18.31± 0.05 | - | 18.77± 0.06 | - | -- | - | - | -- | - | - | ||
58436.02 | 18.22± 0.06 | - | 18.79± 0.06 | - | 17.58± 0.06 | - | -- | - | - | |||
58672.32 | 18.44± 0.06 | - | -- | - | - | 17.77± 0.05 | - | 16.75± 0.07 | - | |||
58695.29 | 18.45± 0.06 | - | 18.80± 0.06 | - | -- | - | - | -- | - | - | ||
58696.28 | 18.38± 0.04 | - | -- | - | - | 17.77± 0.05 | - | 16.71± 0.06 | - | |||
58757.08 | 18.45± 0.05 | - | -- | - | - | 17.77± 0.05 | - | -- | - | - | ||
58784.04 | 18.46± 0.04 | - | 18.80± 0.05 | - | -- | - | - | -- | - | - | ||
58812.10 | 18.38± 0.04 | - | -- | - | - | 17.72± 0.05 | - | -- | - | - | ||
59001.37 | 18.42± 0.06 | - | -- | - | - | 17.80± 0.05 | - | -- | - | - | ||
59055.33 | 18.53± 0.05 | - | 18.84± 0.05 | - | -- | - | - | 16.86± 0.06 | - | |||
59077.22 | 18.52± 0.06 | - | -- | - | - | 17.92± 0.05 | - | -- | - | - | ||
59131.05 | 18.46± 0.05 | - | 18.73± 0.07 | - | -- | - | - | -- | - | - | ||
59166.07 | 18.39± 0.05 | - | -- | - | - | -- | - | - | 16.71± 0.06 | - | ||
59194.07 | 18.48± 0.04 | - | -- | - | - | 17.84± 0.04 | - | -- | - | - | ||
59376.36 | 18.49± 0.06 | - | 18.87± 0.07 | - | -- | - | - | -- | - | - | ||
59409.38 | 18.59± 0.07 | - | -- | - | - | 17.92± 0.06 | - | -- | - | - | ||
59442.29 | 18.60± 0.05 | - | 18.85± 0.06 | - | -- | - | - | 16.87± 0.06 | - | |||
59467.14 | 18.51± 0.07 | - | -- | - | - | 17.92± 0.05 | - | -- | - | - | ||
59522.07 | 18.44± 0.04 | - | 18.79± 0.05 | - | -- | - | - | -- | - | - | ||
59546.07 | 18.44± 0.04 | - | -- | - | - | -- | - | - | 16.78± 0.05 | - | ||
59583.07 | 18.37± 0.05 | - | -- | - | - | 17.62± 0.05 | - | -- | - | - | ||
59753.34 | 18.48± 0.06 | - | -- | - | - | 17.68± 0.04 | - | -- | - | - | ||
59816.19 | 18.52± 0.05 | - | 18.81± 0.06 | - | -- | - | - | -- | - | - | ||
59848.08 | 18.79± 0.12 | X | 18.70± 0.11 | - | -- | - | - | -- | - | - | ||
59851.07 | 18.36± 0.08 | - | -- | - | - | 17.78± 0.06 | - | 16.83± 0.07 | - | |||
59879.07 | 18.52± 0.07 | - | 18.77± 0.07 | - | -- | - | - | -- | - | - | ||
59905.22 | 18.47± 0.04 | - | 18.81± 0.05 | - | -- | - | - | 16.73± 0.06 | - | |||
59879.08 | -- | - | - | 18.79± 0.07 | T | -- | - | - | -- | - | - |
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 [0.24 mag] | B [0.55 mag] | R [0.72 mag] | |
---|---|---|---|
B [0.24 mag] | 0.18 (23) | ||
R [0.72 mag] | 0.89 (21) | 0.56 (6) | |
I [0.36 mag] | 0.83 (12) | 0.92 (4) | 0.62 (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) | 0.63 | 0.31 | ||
R (I|R) | 7.23 | 0.74 | 5.15 | 0.04 | |
I (I|R) | 4.62 | 1.31 | --- | --- | --- | ---- |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5