MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
57743.02 | 18.14± 0.04 | - | 18.55± 0.04 | - | 17.79± 0.03 | - | 17.59± 0.05 | - | ||||
57964.26 | 18.24± 0.05 | - | -- | - | - | 17.86± 0.04 | - | -- | - | - | ||
57988.31 | 18.26± 0.04 | - | 18.56± 0.05 | - | -- | - | - | 17.58± 0.05 | - | |||
58073.12 | 18.20± 0.04 | - | 18.54± 0.06 | - | -- | - | - | -- | - | - | ||
58098.18 | 18.32± 0.03 | - | -- | - | - | -- | - | - | 17.64± 0.05 | - | ||
58316.32 | 18.20± 0.05 | - | 18.54± 0.05 | - | 17.84± 0.04 | - | -- | - | - | |||
58372.17 | 18.20± 0.04 | - | -- | - | - | -- | - | - | 17.61± 0.07 | - | ||
58403.14 | 18.38± 0.04 | - | 18.60± 0.05 | - | -- | - | - | -- | - | - | ||
58433.06 | 18.48± 0.04 | - | 18.88± 0.05 | - | 18.14± 0.04 | - | -- | - | - | |||
58672.29 | 18.29± 0.05 | - | 18.53± 0.05 | - | -- | - | - | -- | - | - | ||
58695.24 | 18.36± 0.05 | - | -- | - | - | 17.95± 0.04 | - | 17.73± 0.05 | - | |||
59019.39 | 18.21± 0.06 | T | > 14.90 | - | -- | - | - | -- | - | - | ||
59059.26 | 18.26± 0.03 | - | 18.53± 0.04 | - | 17.87± 0.04 | - | -- | - | - | |||
59081.20 | 18.17± 0.05 | - | -- | - | - | -- | - | - | 17.52± 0.07 | - | ||
59131.16 | 18.25± 0.05 | - | 18.54± 0.06 | - | -- | - | - | -- | - | - | ||
59166.23 | 18.26± 0.03 | - | -- | - | - | -- | - | - | 17.60± 0.07 | - | ||
59194.18 | 18.21± 0.05 | - | -- | - | - | 17.82± 0.05 | - | -- | - | - | ||
59380.38 | 18.19± 0.07 | - | -- | - | - | 17.81± 0.06 | - | -- | - | - | ||
59441.35 | 18.37± 0.03 | - | 18.69± 0.04 | - | -- | - | - | -- | - | - | ||
59463.12 | 18.27± 0.05 | - | -- | - | - | -- | - | - | 17.70± 0.07 | - | ||
59483.13 | 18.30± 0.04 | - | -- | - | - | 17.92± 0.05 | - | -- | - | - | ||
59523.06 | 18.25± 0.05 | - | 18.65± 0.05 | - | -- | - | - | -- | - | - | ||
59548.11 | 18.29± 0.05 | - | -- | - | - | 17.91± 0.05 | - | 17.64± 0.07 | - | |||
59759.37 | 18.33± 0.06 | - | 18.72± 0.07 | - | 17.88± 0.06 | - | -- | - | - | |||
59794.29 | 18.28± 0.04 | - | -- | - | - | -- | - | - | 17.60± 0.07 | - | ||
59849.14 | 18.35± 0.04 | - | -- | - | - | -- | - | - | 17.64± 0.07 | - | ||
59903.06 | 18.30± 0.04 | - | 18.64± 0.04 | - | 17.85± 0.04 | - | -- | - | - | |||
59932.07 | 18.31± 0.04 | - | -- | - | - | -- | - | - | 17.52± 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 [0.35 mag] | B [0.34 mag] | R [0.35 mag] | |
---|---|---|---|
B [0.35 mag] | 0.63 (13) | ||
R [0.35 mag] | 0.85 (12) | 0.76 (6) | |
I [0.21 mag] | 0.24 (12) | -.-- (2) | 0.77 (3) |
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) | 3.66 | 0.98 | ||
R (I|R) | 4.62 | 0.93 | 7.21 | 0.12 | |
I (I|R) | 0.83 | 1.57 | --- | --- | --- | ---- |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5