MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56952.12 | 18.00± 0.04 | - | 18.29± 0.06 | - | 17.63± 0.05 | - | -- | - | - | |||
56976.13 | 18.08± 0.06 | - | 18.34± 0.04 | - | 17.68± 0.06 | - | -- | - | - | |||
57309.17 | 18.16± 0.04 | - | 18.37± 0.03 | - | 17.67± 0.03 | - | -- | - | - | |||
57633.41 | 18.07± 0.05 | - | 18.31± 0.04 | - | 17.62± 0.04 | - | -- | - | - | |||
57638.31 | 17.95± 0.08 | - | -- | - | - | -- | - | - | 17.18± 0.09 | - | ||
57964.30 | 18.00± 0.05 | - | 18.26± 0.05 | - | 17.59± 0.06 | - | 17.48± 0.07 | - | ||||
57988.38 | 18.02± 0.06 | - | -- | - | - | 17.58± 0.07 | - | 17.24± 0.09 | - | |||
58073.16 | 18.07± 0.06 | - | 18.39± 0.06 | - | -- | - | - | -- | - | - | ||
58317.34 | 18.23± 0.06 | - | 18.51± 0.04 | - | -- | - | - | -- | - | - | ||
58339.37 | 17.99± 0.08 | - | -- | - | - | 17.54± 0.07 | - | 17.31± 0.08 | - | |||
58342.33 | 17.96± 0.04 | - | 18.25± 0.03 | - | -- | - | - | -- | - | - | ||
58673.36 | 18.09± 0.03 | - | 18.39± 0.04 | - | -- | - | - | -- | - | - | ||
58696.35 | 18.00± 0.03 | - | -- | - | - | 17.50± 0.03 | - | 17.21± 0.04 | - | |||
58757.14 | 17.97± 0.03 | - | -- | - | - | 17.53± 0.03 | - | -- | - | - | ||
58812.18 | 17.89± 0.03 | - | -- | - | - | -- | - | - | 17.19± 0.05 | - | ||
59056.36 | 18.05± 0.04 | - | -- | - | - | 17.57± 0.02 | - | -- | - | - | ||
59059.35 | 18.00± 0.03 | - | 18.34± 0.03 | - | -- | - | - | -- | - | - | ||
59081.24 | 17.98± 0.03 | - | -- | - | - | -- | - | - | 17.22± 0.04 | - | ||
59136.14 | 17.97± 0.02 | - | 18.25± 0.03 | - | 17.58± 0.03 | - | 17.32± 0.04 | - | ||||
59382.38 | 17.96± 0.10 | - | -- | - | - | 17.59± 0.09 | - | -- | - | - | ||
59441.37 | 17.87± 0.03 | - | 18.17± 0.03 | - | -- | - | - | -- | - | - | ||
59463.10 | 17.93± 0.04 | - | -- | - | - | -- | - | - | 17.14± 0.04 | - | ||
59485.14 | 18.01± 0.03 | - | 18.35± 0.04 | - | 17.57± 0.03 | - | -- | - | - | |||
59525.03 | 17.83± 0.03 | - | -- | - | - | 17.46± 0.03 | - | 17.21± 0.04 | - | |||
59551.06 | 17.87± 0.03 | - | 18.14± 0.03 | - | 17.48± 0.03 | - | -- | - | - | |||
59794.31 | 18.05± 0.03 | - | 18.27± 0.05 | - | 17.67± 0.03 | - | -- | - | - | |||
59848.11 | 18.00± 0.05 | - | -- | - | - | -- | - | - | 17.42± 0.06 | - | ||
59905.19 | 18.07± 0.04 | - | 18.33± 0.04 | - | 17.62± 0.03 | - | 17.40± 0.04 | - |
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 [0.36 mag] | B [0.40 mag] | R [0.22 mag] | |
---|---|---|---|
B [0.36 mag] | 0.85 (16) | ||
R [0.22 mag] | 0.69 (17) | 0.56 (10) | |
I [0.34 mag] | 0.30 (12) | 0.01 (3) | 0.58 (7) |
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) | 5.73 | 0.96 | ||
R (I|R) | 4.20 | 1.04 | 1.91 | 0.07 | |
I (I|R) | 2.02 | 0.75 | --- | --- | 3.15 | 0.87 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5