MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.32 | 17.40± 0.05 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.15 | -- | - | - | -- | - | - | 17.08± 0.03 | T | -- | - | - | |
56490.37 | 17.33± 0.04 | - | 17.60± 0.05 | - | -- | - | - | -- | - | - | ||
56536.23 | 17.12± 0.07 | A | -- | - | - | 16.98± 0.04 | A | -- | - | - | ||
56915.13 | 17.47± 0.04 | - | 17.65± 0.04 | - | 17.17± 0.04 | - | -- | - | - | |||
57227.31 | 17.35± 0.04 | - | 17.59± 0.04 | - | 17.10± 0.04 | - | -- | - | - | |||
57310.08 | 17.28± 0.03 | - | -- | - | - | -- | - | - | 16.90± 0.06 | - | ||
57633.32 | 17.50± 0.04 | A | 17.69± 0.05 | A | 17.27± 0.05 | A | -- | - | - | |||
57638.27 | 17.49± 0.05 | - | -- | - | - | -- | - | - | 17.05± 0.05 | - | ||
57928.37 | 17.61± 0.04 | - | 17.76± 0.04 | - | 17.34± 0.04 | - | 17.11± 0.07 | - | ||||
57958.29 | 17.61± 0.04 | - | 17.75± 0.05 | - | -- | - | - | 17.20± 0.05 | - | |||
58043.06 | 17.58± 0.04 | - | 17.73± 0.04 | - | -- | - | - | 17.19± 0.06 | - | |||
58098.09 | 17.58± 0.04 | - | 17.77± 0.04 | - | 17.32± 0.04 | A | -- | - | - | |||
58312.29 | 17.51± 0.04 | - | 17.68± 0.04 | - | 17.26± 0.04 | - | -- | - | - | |||
58316.26 | 17.52± 0.04 | - | -- | - | - | -- | - | - | 17.10± 0.05 | - | ||
58341.23 | 17.34± 0.05 | - | 17.55± 0.05 | - | -- | - | - | -- | - | - | ||
58366.12 | 17.42± 0.04 | - | 17.67± 0.04 | - | -- | - | - | -- | - | - | ||
58375.12 | 17.38± 0.04 | - | -- | - | - | 17.11± 0.04 | - | -- | - | - | ||
58403.08 | 17.55± 0.04 | - | -- | - | - | -- | - | - | 17.15± 0.06 | - | ||
58433.09 | 17.50± 0.06 | - | 17.69± 0.06 | - | 17.22± 0.06 | - | -- | - | - | |||
58671.33 | 17.52± 0.06 | A | 17.71± 0.05 | A | -- | - | - | -- | - | - | ||
58673.29 | 17.50± 0.08 | - | -- | - | - | 17.18± 0.07 | - | 16.96± 0.08 | - | |||
58695.34 | 17.44± 0.05 | - | -- | - | - | 17.19± 0.04 | - | 17.01± 0.04 | - | |||
58696.30 | 17.50± 0.07 | - | 17.64± 0.07 | - | 17.15± 0.08 | - | -- | - | - | |||
58750.10 | 17.53± 0.06 | A | 17.72± 0.05 | A | -- | - | - | -- | - | - | ||
58779.07 | 17.54± 0.05 | A | -- | - | - | 17.28± 0.03 | A | -- | - | - | ||
58812.08 | 17.53± 0.06 | A | -- | - | - | 17.27± 0.08 | - | 17.09± 0.04 | - | |||
59000.39 | 17.45± 0.07 | - | -- | - | - | 17.31± 0.12 | - | -- | - | - | ||
59055.31 | 17.58± 0.07 | - | -- | - | - | 17.33± 0.09 | - | -- | - | - | ||
59077.20 | 17.62± 0.07 | - | 17.82± 0.07 | - | 17.34± 0.07 | - | 17.26± 0.10 | - | ||||
59131.09 | 17.55± 0.07 | - | -- | - | - | 17.30± 0.07 | - | -- | - | - | ||
59166.12 | 17.50± 0.07 | - | -- | - | - | -- | - | - | 17.07± 0.09 | - | ||
59194.11 | 17.51± 0.07 | - | 17.71± 0.07 | - | -- | - | - | -- | - | - | ||
59376.35 | 17.42± 0.07 | - | 17.62± 0.07 | - | -- | - | - | -- | - | - | ||
59409.37 | 17.40± 0.08 | - | -- | - | - | 17.14± 0.08 | - | -- | - | - | ||
59441.26 | 17.48± 0.07 | - | 17.66± 0.08 | - | -- | - | - | 17.04± 0.09 | - | |||
59467.11 | 17.62± 0.08 | - | -- | - | - | 17.31± 0.06 | - | -- | - | - | ||
59522.04 | 17.53± 0.07 | - | 17.72± 0.07 | - | -- | - | - | 17.04± 0.11 | - | |||
59546.05 | 17.50± 0.07 | - | -- | - | - | 17.23± 0.07 | T | -- | - | - | ||
59583.10 | 17.47± 0.07 | - | 17.66± 0.07 | T | -- | - | - | -- | - | - | ||
59739.36 | 17.57± 0.07 | - | 17.67± 0.07 | - | 17.27± 0.07 | - | -- | - | - | |||
59816.14 | 17.44± 0.07 | - | -- | - | - | -- | - | - | 16.94± 0.07 | - | ||
59851.09 | 17.52± 0.07 | - | 17.71± 0.07 | - | 17.30± 0.07 | - | -- | - | - | |||
59879.03 | 17.44± 0.07 | - | -- | - | - | -- | - | - | 16.99± 0.07 | - | ||
59905.07 | 17.44± 0.07 | - | 17.61± 0.06 | - | 17.13± 0.07 | - | -- | - | - |
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 [0.27 mag] | B [0.50 mag] | R [0.36 mag] | |
---|---|---|---|
B [0.27 mag] | 0.81 (24) | ||
R [0.36 mag] | 0.80 (24) | 0.85 (12) | |
I [0.36 mag] | 0.75 (16) | 0.56 (6) | 0.76 (5) |
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) | 2.05 | 0.69 | ||
R (I|R) | 3.54 | 0.88 | 2.17 | 0.11 | |
I (I|R) | 2.56 | 1.19 | 0.43 | 0.60 | 1.53 | 1.08 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5