MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.31 | 17.61± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.16 | -- | - | - | -- | - | - | 17.12± 0.03 | T | -- | - | - | |
56490.35 | 17.66± 0.05 | - | 18.20± 0.05 | - | -- | - | - | -- | - | - | ||
56536.22 | 17.59± 0.08 | - | -- | - | - | 17.16± 0.04 | - | -- | - | - | ||
57633.25 | 17.81± 0.05 | - | 18.50± 0.05 | - | 17.28± 0.04 | - | -- | - | - | |||
57635.36 | 17.79± 0.04 | - | -- | - | - | -- | - | - | 16.84± 0.04 | - | ||
57958.35 | 17.73± 0.05 | - | -- | - | - | 17.18± 0.04 | - | 16.79± 0.04 | - | |||
57963.38 | 17.76± 0.04 | - | 18.27± 0.04 | - | -- | - | - | -- | - | - | ||
57988.34 | 17.62± 0.04 | - | 18.26± 0.04 | - | 17.07± 0.03 | - | 16.72± 0.03 | - | ||||
58067.17 | 17.71± 0.04 | - | -- | - | - | -- | - | - | 16.91± 0.04 | - | ||
58077.11 | 17.59± 0.06 | - | 18.24± 0.06 | - | 17.08± 0.05 | - | 16.75± 0.06 | - | ||||
58312.35 | 17.72± 0.04 | - | 18.37± 0.04 | - | -- | - | - | -- | - | - | ||
58339.35 | 17.65± 0.04 | - | 18.29± 0.04 | - | 17.12± 0.03 | - | -- | - | - | |||
58341.28 | 17.76± 0.05 | - | -- | - | - | 17.26± 0.04 | - | 16.85± 0.05 | - | |||
58342.31 | 17.66± 0.04 | - | -- | - | - | -- | - | - | 16.66± 0.04 | - | ||
58372.15 | 17.61± 0.04 | - | -- | - | - | -- | - | - | 16.65± 0.04 | - | ||
58671.33 | 17.66± 0.06 | - | 18.23± 0.07 | - | -- | - | - | -- | - | - | ||
58696.25 | 17.62± 0.05 | - | 18.27± 0.05 | - | 17.10± 0.04 | - | 16.71± 0.04 | - | ||||
58757.10 | 17.66± 0.04 | - | -- | - | - | 17.13± 0.04 | - | -- | - | - | ||
58784.07 | 17.63± 0.05 | - | 18.36± 0.05 | - | -- | - | - | -- | - | - | ||
58812.12 | 17.67± 0.04 | - | -- | - | - | -- | - | - | 16.75± 0.04 | - | ||
59019.35 | 17.67± 0.04 | - | 18.35± 0.05 | - | -- | - | - | -- | - | - | ||
59059.34 | 17.69± 0.04 | - | -- | - | - | 17.11± 0.03 | - | -- | - | - | ||
59077.17 | 17.63± 0.05 | - | -- | - | - | -- | - | - | 16.71± 0.04 | - | ||
59082.22 | 17.65± 0.04 | - | 18.30± 0.05 | - | -- | - | - | -- | - | - | ||
59136.09 | 17.55± 0.05 | - | 18.09± 0.05 | X | 17.05± 0.04 | - | -- | - | - | |||
59166.10 | 17.64± 0.04 | - | -- | - | - | -- | - | - | 16.78± 0.04 | - | ||
59379.36 | 17.38± 0.06 | X | -- | - | - | 16.93± 0.04 | X | -- | - | - | ||
59442.24 | 17.53± 0.05 | X | 18.13± 0.05 | X | -- | - | - | 16.59± 0.04 | X | |||
59483.09 | 17.64± 0.07 | - | -- | - | - | 16.99± 0.04 | X | -- | - | - | ||
59525.08 | 17.68± 0.05 | - | 18.31± 0.05 | - | -- | - | - | -- | - | - | ||
59546.11 | 17.66± 0.04 | - | -- | - | - | -- | - | - | 16.74± 0.04 | - | ||
59753.38 | 17.65± 0.04 | - | 18.29± 0.08 | - | 17.10± 0.04 | - | -- | - | - | |||
59823.12 | 17.64± 0.05 | - | -- | - | - | -- | - | - | 16.63± 0.05 | - | ||
59854.11 | 17.45± 0.05 | - | 18.04± 0.05 | - | 17.51± 0.10 | X | -- | - | - | |||
59905.15 | 17.61± 0.04 | - | 18.34± 0.07 | - | 17.09± 0.04 | - | 16.78± 0.06 | - |
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 [0.45 mag] | B [0.36 mag] | R [0.23 mag] | |
---|---|---|---|
B [0.45 mag] | 0.61 (16) | ||
R [0.23 mag] | 0.76 (13) | 0.88 (7) | |
I [0.28 mag] | 0.43 (15) | 0.51 (4) | 0.72 (6) |
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) | 2.37 | 1.12 | ||
R (I|R) | 2.40 | 0.90 | 2.14 | 0.04 | |
I (I|R) | 1.70 | 0.76 | --- | --- | 1.79 | 1.42 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5