MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.40 | 17.67± 0.06 | - | -- | - | - | 17.51± 0.10 | X | -- | - | - | ||
56599.22 | 17.62± 0.07 | - | 17.76± 0.05 | - | 17.35± 0.06 | - | -- | - | - | |||
57035.14 | 17.66± 0.04 | - | 17.79± 0.05 | - | 17.32± 0.05 | - | -- | - | - | |||
57310.16 | 17.56± 0.06 | - | 17.80± 0.04 | - | 17.28± 0.05 | - | -- | - | - | |||
57634.41 | 17.49± 0.07 | - | 17.72± 0.08 | - | 17.24± 0.08 | - | -- | - | - | |||
57638.40 | 17.61± 0.05 | A | 17.91± 0.04 | - | 17.39± 0.04 | - | 17.06± 0.09 | A | ||||
57988.43 | 17.61± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
58043.16 | 17.54± 0.05 | - | 17.79± 0.06 | - | 17.29± 0.06 | - | 17.05± 0.10 | - | ||||
58108.17 | 17.58± 0.05 | - | 17.79± 0.06 | - | -- | - | - | 17.04± 0.09 | - | |||
58339.40 | 17.59± 0.05 | - | 17.78± 0.06 | - | 17.29± 0.06 | - | -- | - | - | |||
58375.16 | 17.59± 0.05 | - | -- | - | - | -- | - | - | 17.03± 0.10 | - | ||
58433.02 | 17.57± 0.05 | - | -- | - | - | 17.27± 0.05 | - | 17.20± 0.11 | - | |||
58695.39 | 17.53± 0.05 | - | -- | - | - | 17.25± 0.04 | - | -- | - | - | ||
58696.41 | 17.52± 0.05 | - | 17.76± 0.07 | - | 17.22± 0.07 | - | -- | - | - | |||
58750.22 | 17.50± 0.04 | - | 17.79± 0.03 | - | -- | - | - | 16.92± 0.08 | - | |||
58757.17 | 17.52± 0.05 | - | -- | - | - | 17.28± 0.05 | - | -- | - | - | ||
58784.14 | 17.56± 0.05 | A | -- | - | - | 17.30± 0.05 | - | 17.07± 0.08 | - | |||
59059.40 | 17.51± 0.06 | - | -- | - | - | 17.26± 0.05 | - | 17.01± 0.08 | - | |||
59081.34 | 17.55± 0.05 | A | 17.78± 0.05 | A | 17.29± 0.05 | A | 17.07± 0.07 | - | ||||
59082.38 | 17.56± 0.05 | - | 17.83± 0.03 | - | 17.31± 0.04 | - | -- | - | - | |||
59084.38 | -- | - | - | -- | - | - | 17.27± 0.07 | T | -- | - | - | |
59084.25 | -- | - | - | -- | - | - | 17.27± 0.04 | T | -- | - | - | |
59161.14 | 17.49± 0.04 | - | -- | - | - | 17.21± 0.04 | - | 16.95± 0.09 | - | |||
59171.15 | 17.52± 0.05 | A | 17.71± 0.06 | A | 17.23± 0.05 | - | 16.91± 0.08 | A | ||||
59227.14 | 17.49± 0.05 | A | 17.69± 0.05 | A | 17.23± 0.05 | A | 16.98± 0.08 | - | ||||
59415.39 | 17.55± 0.07 | T | -- | - | - | -- | - | - | -- | - | - | |
59441.42 | 17.56± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
59442.41 | 17.49± 0.05 | - | -- | - | - | 17.24± 0.04 | - | -- | - | - | ||
59463.33 | 17.53± 0.06 | A | 17.73± 0.06 | A | -- | - | - | 17.07± 0.08 | - | |||
59522.13 | 17.50± 0.05 | - | -- | - | - | 17.23± 0.05 | - | 17.02± 0.08 | - | |||
59525.12 | 17.49± 0.05 | - | -- | - | - | 17.23± 0.04 | - | -- | - | - | ||
59546.20 | 17.55± 0.05 | A | 17.82± 0.03 | - | -- | - | - | 17.03± 0.08 | - | |||
59551.14 | 17.51± 0.06 | A | -- | - | - | -- | - | - | 17.06± 0.08 | - | ||
59583.20 | 17.55± 0.04 | - | -- | - | - | 17.28± 0.05 | - | -- | - | - | ||
59608.14 | 17.44± 0.05 | - | 17.61± 0.08 | - | 17.16± 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 [0.30 mag] | B [0.22 mag] | R [0.23 mag] | |
---|---|---|---|
B [0.30 mag] | 0.43 (17) | ||
R [0.23 mag] | 0.74 (23) | 0.79 (13) | |
I [0.29 mag] | 0.33 (16) | 0.19 (9) | 0.28 (10) |
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) | 0.70 | 1.05 | ||
R (I|R) | 0.86 | 0.96 | 2.14 | 0.09 | |
I (I|R) | 0.35 | 1.06 | 0.41 | 1.38 | 0.56 | 1.33 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5