MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56604.11 | 16.29± 0.03 | - | 16.90± 0.03 | - | 15.87± 0.04 | - | -- | - | - | |||
56930.16 | 16.30± 0.03 | - | 16.92± 0.04 | - | 15.87± 0.04 | - | -- | - | - | |||
56951.10 | 16.36± 0.04 | - | 16.95± 0.03 | - | 15.94± 0.05 | - | -- | - | - | |||
57307.14 | 16.36± 0.04 | A | 16.93± 0.03 | A | 15.93± 0.04 | A | -- | - | - | |||
57340.22 | 16.36± 0.06 | - | -- | - | - | -- | - | - | 15.50± 0.08 | - | ||
57634.30 | -- | - | - | 16.98± 0.04 | T | 15.94± 0.06 | T | -- | - | - | ||
57638.23 | 16.37± 0.05 | - | 16.98± 0.05 | - | 15.93± 0.07 | - | 15.51± 0.07 | - | ||||
57963.35 | 16.34± 0.04 | - | 16.97± 0.03 | - | -- | - | - | 15.51± 0.07 | - | |||
58035.07 | 16.33± 0.06 | - | -- | - | - | 15.90± 0.07 | - | -- | - | - | ||
58077.14 | 16.34± 0.04 | - | 16.98± 0.03 | - | -- | - | - | 15.50± 0.07 | - | |||
58317.33 | 16.33± 0.04 | - | -- | - | - | -- | - | - | 15.49± 0.07 | - | ||
58339.32 | 16.35± 0.04 | - | 16.95± 0.04 | - | 15.92± 0.05 | - | -- | - | - | |||
58373.13 | 16.32± 0.04 | - | 16.91± 0.04 | - | -- | - | - | -- | - | - | ||
58672.36 | 16.29± 0.03 | - | -- | - | - | 15.88± 0.04 | - | 15.45± 0.05 | - | |||
58695.27 | 16.31± 0.03 | - | 16.93± 0.04 | - | -- | - | - | -- | - | - | ||
58779.11 | 16.30± 0.03 | - | -- | - | - | 15.88± 0.03 | - | -- | - | - | ||
59026.34 | 16.30± 0.04 | A | -- | - | - | 15.89± 0.05 | - | -- | - | - | ||
59059.29 | 16.30± 0.04 | - | 16.94± 0.04 | - | -- | - | - | 15.45± 0.06 | - | |||
59082.29 | 16.30± 0.04 | - | 16.93± 0.04 | - | 15.89± 0.05 | - | -- | - | - | |||
59131.15 | 16.29± 0.04 | - | -- | - | - | 15.88± 0.04 | - | -- | - | - | ||
59166.21 | 16.29± 0.04 | - | -- | - | - | -- | - | - | 15.45± 0.07 | - | ||
59194.16 | 16.29± 0.03 | - | 16.92± 0.03 | - | -- | - | - | -- | - | - | ||
59380.34 | 16.31± 0.04 | - | 16.93± 0.04 | - | -- | - | - | -- | - | - | ||
59415.32 | 16.32± 0.04 | - | -- | - | - | 15.88± 0.06 | - | -- | - | - | ||
59441.33 | 16.31± 0.03 | - | -- | - | - | -- | - | - | 15.45± 0.06 | A | ||
59483.11 | 16.31± 0.04 | - | 16.92± 0.04 | - | -- | - | - | -- | - | - | ||
59523.04 | 16.30± 0.04 | - | -- | - | - | 15.88± 0.05 | - | 15.50± 0.06 | - | |||
59548.09 | 16.30± 0.04 | - | 16.95± 0.04 | - | -- | - | - | -- | - | - | ||
59794.27 | 16.30± 0.04 | - | 16.93± 0.04 | - | -- | - | - | -- | - | - | ||
59823.20 | 16.31± 0.04 | - | -- | - | - | 15.88± 0.04 | - | -- | - | - | ||
59849.12 | 16.30± 0.03 | - | -- | - | - | -- | - | - | 15.45± 0.07 | - | ||
59904.08 | 16.30± 0.03 | - | -- | - | - | 15.90± 0.04 | - | 15.46± 0.06 | - | |||
59932.05 | 16.29± 0.04 | - | 16.91± 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 [0.08 mag] | B [0.09 mag] | R [0.07 mag] | |
---|---|---|---|
B [0.08 mag] | 0.52 (18) | ||
R [0.07 mag] | 0.83 (16) | 0.67 (8) | |
I [0.07 mag] | 0.67 (12) | 0.84 (4) | 0.42 (4) |
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) | 0.33 | 0.90 | ||
R (I|R) | 0.30 | 1.53 | 1.53 | 0.03 | |
I (I|R) | 0.22 | 1.54 | --- | --- | --- | ---- |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5