MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56142.31 | 16.63± 0.04 | T | -- | - | - | -- | - | - | -- | - | - | |
56267.16 | -- | - | - | -- | - | - | 16.49± 0.04 | T | -- | - | - | |
56490.35 | 16.79± 0.05 | - | 17.02± 0.05 | - | -- | - | - | -- | - | - | ||
56536.22 | 16.92± 0.08 | - | -- | - | - | 16.85± 0.04 | - | -- | - | - | ||
56923.11 | 17.14± 0.04 | - | 17.27± 0.04 | - | 17.01± 0.04 | - | -- | - | - | |||
57227.36 | 17.39± 0.04 | - | 17.53± 0.04 | - | -- | - | - | -- | - | - | ||
57314.12 | 17.44± 0.04 | - | -- | - | - | -- | - | - | 17.27± 0.05 | - | ||
57633.25 | 17.26± 0.04 | - | 17.34± 0.04 | - | 17.08± 0.03 | - | -- | - | - | |||
57635.36 | 17.22± 0.04 | - | -- | - | - | -- | - | - | 16.99± 0.04 | - | ||
57958.35 | 17.43± 0.05 | - | -- | - | - | 17.20± 0.04 | - | 17.16± 0.04 | - | |||
57963.38 | 17.39± 0.04 | - | 17.50± 0.04 | - | -- | - | - | -- | - | - | ||
58067.17 | 17.43± 0.04 | - | -- | - | - | -- | - | - | 17.28± 0.05 | - | ||
58312.35 | 17.35± 0.04 | - | 17.43± 0.04 | - | -- | - | - | -- | - | - | ||
58341.28 | 17.38± 0.04 | - | -- | - | - | 17.11± 0.04 | - | 17.08± 0.04 | - | |||
58366.16 | 17.29± 0.05 | - | 17.37± 0.04 | - | -- | - | - | -- | - | - | ||
58433.11 | 17.27± 0.05 | - | 17.35± 0.05 | - | -- | - | - | -- | - | - | ||
58671.33 | 17.45± 0.05 | - | 17.60± 0.05 | - | -- | - | - | -- | - | - | ||
58696.25 | 17.39± 0.05 | - | 17.43± 0.05 | - | 17.16± 0.04 | - | 17.12± 0.04 | - | ||||
58757.10 | 17.27± 0.04 | - | -- | - | - | 17.06± 0.04 | - | -- | - | - | ||
58784.07 | 17.32± 0.04 | - | 17.43± 0.04 | - | -- | - | - | -- | - | - | ||
58812.12 | 17.20± 0.04 | - | -- | - | - | -- | - | - | 16.99± 0.03 | - | ||
59019.33 | 17.32± 0.05 | - | 17.48± 0.04 | - | -- | - | - | -- | - | - | ||
59055.30 | 17.23± 0.04 | - | -- | - | - | 17.06± 0.03 | - | 16.99± 0.05 | - | |||
59082.20 | 17.23± 0.03 | - | 17.36± 0.03 | - | 17.08± 0.02 | - | -- | - | - | |||
59131.07 | 17.28± 0.03 | - | -- | - | - | 17.10± 0.03 | - | -- | - | - | ||
59166.09 | 17.29± 0.03 | - | -- | - | - | -- | - | - | 17.04± 0.04 | - | ||
59194.09 | 17.25± 0.03 | - | 17.34± 0.03 | - | -- | - | - | -- | - | - | ||
59379.35 | 17.23± 0.04 | - | -- | - | - | 17.08± 0.03 | - | -- | - | - | ||
59409.40 | 17.11± 0.04 | - | 17.28± 0.14 | X | -- | - | - | -- | - | - | ||
59442.26 | 17.18± 0.03 | - | -- | - | - | 17.01± 0.03 | - | 16.93± 0.04 | - | |||
59467.16 | 17.08± 0.03 | - | 17.22± 0.03 | - | -- | - | - | -- | - | - | ||
59522.09 | 17.04± 0.03 | - | -- | - | - | 16.89± 0.03 | - | -- | - | - | ||
59546.09 | 17.08± 0.03 | - | 17.21± 0.03 | - | -- | - | - | -- | - | - | ||
59583.09 | 17.23± 0.04 | A | -- | - | - | -- | - | - | 17.03± 0.04 | A | ||
59753.32 | 17.31± 0.04 | - | 17.36± 0.05 | - | -- | - | - | -- | - | - | ||
59816.18 | 17.30± 0.03 | - | -- | - | - | 17.10± 0.03 | - | -- | - | - | ||
59848.06 | 17.21± 0.04 | - | -- | - | - | -- | - | - | 16.95± 0.05 | - | ||
59854.14 | 17.29± 0.03 | - | 17.40± 0.03 | - | 17.11± 0.03 | - | -- | - | - | |||
59879.09 | 17.37± 0.03 | - | -- | - | - | -- | - | - | 17.17± 0.05 | - | ||
59905.12 | 17.31± 0.03 | - | 17.37± 0.03 | - | 17.12± 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 [0.58 mag] | B [0.82 mag] | R [0.71 mag] | |
---|---|---|---|
B [0.58 mag] | 0.93 (19) | ||
R [0.71 mag] | 0.95 (16) | 0.94 (6) | |
I [0.34 mag] | 0.88 (13) | -.-- (1) | 0.99 (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) | 10.67 | 0.79 | ||
R (I|R) | 6.84 | 1.17 | 1.32 | 0.12 | |
I (I|R) | 6.20 | 1.11 | --- | --- | 4.02 | 1.04 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5