MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.31 | 16.55± 0.04 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.16 | -- | - | - | -- | - | - | 16.01± 0.03 | T | -- | - | - | |
56490.35 | 16.40± 0.05 | - | 17.06± 0.05 | - | -- | - | - | -- | - | - | ||
56536.22 | 16.27± 0.08 | - | -- | - | - | 15.96± 0.04 | - | -- | - | - | ||
56923.11 | 16.35± 0.04 | - | 16.97± 0.04 | - | 15.97± 0.04 | - | -- | - | - | |||
57227.36 | 16.28± 0.04 | - | 16.90± 0.03 | - | -- | - | - | -- | - | - | ||
57314.12 | 16.39± 0.04 | - | -- | - | - | -- | - | - | 15.62± 0.04 | - | ||
57633.25 | 16.38± 0.04 | - | 17.06± 0.04 | - | 15.99± 0.03 | - | -- | - | - | |||
57635.36 | 16.38± 0.04 | - | -- | - | - | -- | - | - | 15.61± 0.03 | - | ||
57958.35 | 16.37± 0.04 | - | -- | - | - | 15.99± 0.04 | - | 15.62± 0.04 | - | |||
57963.38 | 16.38± 0.04 | - | 17.00± 0.04 | - | -- | - | - | -- | - | - | ||
57988.34 | 16.39± 0.03 | - | 17.01± 0.03 | - | 16.02± 0.03 | - | 15.63± 0.03 | - | ||||
58067.17 | 16.32± 0.03 | - | -- | - | - | -- | - | - | 15.57± 0.04 | - | ||
58077.11 | 16.36± 0.05 | - | 17.01± 0.04 | - | 15.99± 0.05 | - | 15.62± 0.05 | - | ||||
58312.35 | 16.24± 0.04 | - | 16.86± 0.04 | - | -- | - | - | -- | - | - | ||
58339.35 | 16.32± 0.04 | - | 16.94± 0.03 | - | 15.95± 0.03 | - | -- | - | - | |||
58341.28 | 16.29± 0.04 | - | -- | - | - | 15.93± 0.04 | - | 15.55± 0.04 | - | |||
58342.31 | 16.32± 0.03 | - | -- | - | - | -- | - | - | 15.56± 0.03 | - | ||
58366.16 | 16.38± 0.05 | - | 17.03± 0.04 | - | -- | - | - | -- | - | - | ||
58372.15 | 16.37± 0.03 | - | -- | - | - | -- | - | - | 15.62± 0.04 | - | ||
58433.11 | 16.49± 0.05 | - | 17.19± 0.05 | - | -- | - | - | -- | - | - | ||
58671.33 | 16.36± 0.05 | - | 16.99± 0.05 | - | -- | - | - | -- | - | - | ||
58696.25 | 16.34± 0.05 | - | 16.93± 0.05 | - | 15.90± 0.04 | - | 15.53± 0.03 | - | ||||
58757.10 | 16.37± 0.04 | - | -- | - | - | 15.98± 0.03 | - | -- | - | - | ||
58784.07 | 16.43± 0.04 | - | 17.10± 0.04 | - | -- | - | - | -- | - | - | ||
58812.12 | 16.42± 0.04 | - | -- | - | - | -- | - | - | 15.64± 0.03 | - | ||
59019.35 | 16.45± 0.03 | - | 17.14± 0.04 | - | -- | - | - | -- | - | - | ||
59059.34 | 16.39± 0.03 | - | -- | - | - | 15.99± 0.03 | - | -- | - | - | ||
59077.17 | 16.34± 0.04 | - | -- | - | - | -- | - | - | 15.60± 0.03 | - | ||
59082.22 | 16.36± 0.04 | - | 16.98± 0.04 | - | -- | - | - | -- | - | - | ||
59136.09 | 16.37± 0.04 | - | 17.00± 0.04 | - | 15.98± 0.03 | - | -- | - | - | |||
59166.10 | 16.38± 0.03 | - | -- | - | - | -- | - | - | 15.61± 0.03 | - | ||
59379.36 | 16.49± 0.05 | - | -- | - | - | 16.07± 0.04 | - | -- | - | - | ||
59442.24 | 16.42± 0.04 | - | 17.13± 0.04 | - | -- | - | - | 15.62± 0.03 | - | |||
59483.09 | 16.39± 0.04 | - | -- | - | - | 16.00± 0.03 | - | -- | - | - | ||
59525.08 | 16.31± 0.05 | - | 16.95± 0.04 | - | -- | - | - | -- | - | - | ||
59546.11 | 16.30± 0.04 | - | -- | - | - | -- | - | - | 15.54± 0.03 | - | ||
59753.38 | 16.36± 0.04 | - | 16.98± 0.05 | - | 15.97± 0.03 | - | -- | - | - | |||
59823.12 | 16.39± 0.04 | - | -- | - | - | -- | - | - | 15.62± 0.04 | - | ||
59854.11 | 16.40± 0.04 | - | 17.04± 0.04 | - | 16.02± 0.04 | - | -- | - | - | |||
59905.15 | 16.39± 0.03 | - | 16.98± 0.06 | - | 15.99± 0.03 | - | 15.62± 0.05 | - |
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 [0.33 mag] | B [0.31 mag] | R [0.17 mag] | |
---|---|---|---|
B [0.33 mag] | 0.91 (22) | ||
R [0.17 mag] | 0.73 (17) | 0.67 (10) | |
I [0.11 mag] | 0.74 (17) | 0.37 (5) | 0.96 (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) | 2.59 | 1.48 | ||
R (I|R) | 0.92 | 0.88 | 2.12 | 0.03 | |
I (I|R) | 0.82 | 0.97 | 1.19 | 1.29 | 1.40 | 0.87 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5