MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.33 | 17.72± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.16 | -- | - | - | -- | - | - | 17.18± 0.04 | T | -- | - | - | |
56490.35 | 17.73± 0.05 | - | 18.52± 0.06 | - | -- | - | - | -- | - | - | ||
56536.22 | 17.70± 0.08 | - | -- | - | - | 17.23± 0.04 | - | -- | - | - | ||
56537.22 | 17.65± 0.04 | - | 18.32± 0.04 | - | 17.15± 0.04 | - | -- | - | - | |||
56593.08 | 17.75± 0.04 | - | -- | - | - | 17.27± 0.04 | - | -- | - | - | ||
56923.11 | 17.65± 0.04 | - | 18.35± 0.05 | - | 17.20± 0.04 | - | -- | - | - | |||
57227.36 | 17.63± 0.04 | - | 18.32± 0.04 | - | -- | - | - | -- | - | - | ||
57314.12 | 17.71± 0.04 | - | -- | - | - | -- | - | - | 16.75± 0.04 | - | ||
57633.25 | 17.71± 0.05 | - | 18.36± 0.05 | - | 17.20± 0.04 | - | -- | - | - | |||
57635.39 | 17.66± 0.06 | A | 18.39± 0.08 | - | 17.19± 0.07 | - | 16.69± 0.06 | A | ||||
57958.35 | 17.68± 0.05 | - | -- | - | - | 17.19± 0.04 | - | 16.75± 0.04 | - | |||
57963.38 | 17.65± 0.04 | - | 18.44± 0.05 | - | -- | - | - | -- | - | - | ||
58067.17 | 17.56± 0.04 | - | -- | - | - | -- | - | - | 16.57± 0.04 | - | ||
58312.35 | 17.60± 0.04 | - | 18.31± 0.05 | - | -- | - | - | -- | - | - | ||
58341.28 | 17.63± 0.04 | - | -- | - | - | 17.15± 0.04 | - | 16.72± 0.04 | - | |||
58366.16 | 17.68± 0.05 | - | 18.37± 0.05 | - | -- | - | - | -- | - | - | ||
58433.11 | 17.62± 0.05 | - | 18.36± 0.06 | - | -- | - | - | -- | - | - | ||
58671.30 | 17.63± 0.04 | - | 18.35± 0.05 | - | -- | - | - | -- | - | - | ||
58695.31 | 17.60± 0.04 | - | -- | - | - | 17.10± 0.04 | - | 16.62± 0.05 | - | |||
58750.10 | 17.57± 0.04 | - | 18.30± 0.03 | - | -- | - | - | -- | - | - | ||
58779.07 | 17.59± 0.04 | - | -- | - | - | 17.10± 0.04 | - | -- | - | - | ||
58836.18 | 17.63± 0.04 | - | -- | - | - | -- | - | - | 16.64± 0.05 | - | ||
59019.33 | 17.57± 0.05 | - | 18.33± 0.05 | - | -- | - | - | -- | - | - | ||
59055.30 | 17.63± 0.04 | - | -- | - | - | 17.16± 0.03 | - | 16.69± 0.04 | - | |||
59082.20 | 17.65± 0.03 | - | 18.37± 0.04 | - | 17.20± 0.02 | - | -- | - | - | |||
59131.07 | 17.63± 0.03 | - | -- | - | - | 17.17± 0.03 | - | -- | - | - | ||
59166.09 | 17.60± 0.03 | - | -- | - | - | -- | - | - | 16.64± 0.04 | - | ||
59194.09 | 17.70± 0.03 | - | 18.43± 0.03 | - | -- | - | - | -- | - | - | ||
59379.35 | 17.63± 0.04 | - | -- | - | - | 17.13± 0.04 | - | -- | - | - | ||
59409.40 | 17.62± 0.06 | - | 17.87± 0.25 | X | -- | - | - | -- | - | - | ||
59442.26 | 17.67± 0.03 | - | -- | - | - | 17.18± 0.03 | - | 16.70± 0.04 | - | |||
59467.16 | 17.64± 0.04 | - | 18.38± 0.05 | - | -- | - | - | -- | - | - | ||
59522.09 | 17.61± 0.03 | - | -- | - | - | 17.11± 0.03 | - | -- | - | - | ||
59546.09 | 17.65± 0.03 | - | 18.36± 0.04 | - | -- | - | - | -- | - | - | ||
59583.09 | 17.57± 0.04 | - | -- | - | - | -- | - | - | 16.61± 0.04 | - | ||
59753.32 | 17.59± 0.05 | - | 18.24± 0.06 | - | -- | - | - | -- | - | - | ||
59816.18 | 17.65± 0.04 | - | -- | - | - | 17.19± 0.03 | - | -- | - | - | ||
59848.06 | 17.60± 0.04 | - | -- | - | - | -- | - | - | 16.57± 0.04 | - | ||
59854.14 | 17.58± 0.03 | - | 18.42± 0.05 | - | 17.11± 0.03 | - | -- | - | - | |||
59879.09 | 17.60± 0.03 | - | -- | - | - | -- | - | - | 16.59± 0.04 | - | ||
59905.12 | 17.68± 0.03 | - | 18.39± 0.04 | - | 17.18± 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 [0.27 mag] | B [0.19 mag] | R [0.18 mag] | |
---|---|---|---|
B [0.27 mag] | 0.42 (20) | ||
R [0.18 mag] | 0.82 (19) | 0.09 (7) | |
I [0.19 mag] | 0.77 (13) | -.-- (1) | 0.63 (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) | 0.87 | 1.00 | ||
R (I|R) | 1.23 | 0.86 | -2.84 | 0.01 | |
I (I|R) | 1.47 | 0.71 | --- | --- | 0.57 | 0.90 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5