MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.39 | 17.30± 0.04 | - | -- | - | - | 17.15± 0.11 | - | -- | - | - | ||
56593.16 | 17.27± 0.03 | - | 17.37± 0.03 | - | -- | - | - | -- | - | - | ||
56599.18 | 17.18± 0.04 | A | 17.20± 0.05 | A | 16.89± 0.06 | A | -- | - | - | |||
56976.19 | 17.00± 0.04 | - | 17.10± 0.04 | - | 16.77± 0.07 | - | -- | - | - | |||
57328.16 | 17.14± 0.03 | - | 17.20± 0.04 | - | 16.91± 0.04 | - | -- | - | - | |||
57634.36 | 17.54± 0.04 | A | 17.55± 0.06 | A | 17.27± 0.06 | A | 17.28± 0.07 | A | ||||
57687.13 | 17.27± 0.04 | - | 17.30± 0.06 | - | 17.03± 0.04 | - | 17.01± 0.07 | - | ||||
57964.37 | 17.57± 0.04 | - | 17.61± 0.06 | - | 17.31± 0.04 | - | 17.32± 0.06 | - | ||||
57988.41 | 17.20± 0.04 | - | 17.25± 0.04 | - | -- | - | - | -- | - | - | ||
58043.10 | 17.36± 0.04 | - | -- | - | - | 17.11± 0.04 | - | 17.11± 0.07 | - | |||
58045.15 | 17.39± 0.04 | - | 17.41± 0.07 | - | 17.14± 0.04 | - | -- | - | - | |||
58073.18 | 17.25± 0.04 | - | 17.21± 0.06 | - | -- | - | - | -- | - | - | ||
58103.16 | 17.09± 0.04 | A | 17.17± 0.04 | - | -- | - | - | 16.81± 0.06 | - | |||
58108.14 | 17.29± 0.05 | - | 17.38± 0.06 | - | -- | - | - | 17.06± 0.08 | - | |||
58317.39 | 17.21± 0.04 | - | -- | - | - | 17.00± 0.07 | - | -- | - | - | ||
58341.40 | 17.41± 0.05 | - | 17.44± 0.08 | - | 17.20± 0.07 | - | 17.24± 0.10 | - | ||||
58342.36 | 17.40± 0.04 | - | 17.49± 0.06 | - | 17.21± 0.04 | - | 17.11± 0.06 | - | ||||
58403.15 | 17.17± 0.04 | - | -- | - | - | -- | - | - | 16.85± 0.09 | - | ||
58420.06 | 17.17± 0.04 | - | 17.17± 0.06 | - | 16.90± 0.04 | - | 16.89± 0.07 | - | ||||
58673.38 | 17.40± 0.03 | - | 17.50± 0.04 | - | -- | - | - | -- | - | - | ||
58696.39 | 17.08± 0.04 | - | 17.09± 0.06 | - | 16.90± 0.04 | - | -- | - | - | |||
58750.19 | 17.15± 0.03 | - | -- | - | - | 16.90± 0.05 | - | -- | - | - | ||
58779.15 | 17.11± 0.04 | - | -- | - | - | 16.89± 0.05 | - | 16.88± 0.08 | - | |||
58902.05 | 17.23± 0.03 | - | -- | - | - | -- | - | - | 17.04± 0.08 | - | ||
59056.38 | 17.69± 0.05 | - | 17.79± 0.06 | - | 17.38± 0.05 | - | 17.38± 0.08 | - | ||||
59082.34 | 17.11± 0.03 | A | 17.16± 0.05 | A | 16.91± 0.05 | A | -- | - | - | |||
59084.29 | -- | - | - | -- | - | - | 16.85± 0.05 | T | -- | - | - | |
59161.11 | 17.08± 0.03 | - | 17.18± 0.03 | - | 16.86± 0.04 | - | -- | - | - | |||
59171.09 | 17.38± 0.04 | A | 17.41± 0.05 | A | 17.11± 0.05 | - | 17.13± 0.08 | A | ||||
59227.08 | 17.08± 0.03 | A | 17.10± 0.04 | A | 16.86± 0.05 | - | -- | - | - | |||
59415.38 | 17.17± 0.03 | - | 17.23± 0.03 | - | -- | - | - | -- | - | - | ||
59441.41 | 17.23± 0.04 | - | -- | - | - | 17.04± 0.05 | - | 16.96± 0.07 | - | |||
59442.39 | 17.25± 0.02 | - | -- | - | - | 17.01± 0.05 | - | 17.04± 0.08 | - | |||
59463.27 | 17.10± 0.04 | - | 17.15± 0.06 | - | -- | - | - | -- | - | - | ||
59523.17 | 17.13± 0.02 | - | 17.18± 0.02 | - | -- | - | - | -- | - | - | ||
59525.15 | 17.02± 0.03 | A | -- | - | - | 16.79± 0.05 | - | 16.73± 0.09 | - | |||
59546.19 | 17.05± 0.03 | A | 17.05± 0.06 | - | 16.84± 0.04 | - | -- | - | - | |||
59551.12 | 17.48± 0.03 | A | 17.58± 0.03 | - | -- | - | - | 17.18± 0.08 | - | |||
59583.17 | 17.28± 0.03 | A | 17.33± 0.06 | - | -- | - | - | 16.94± 0.08 | - | |||
59608.11 | 17.21± 0.04 | A | -- | - | - | 16.96± 0.05 | A | -- | - | - |
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 [0.73 mag] | B [0.69 mag] | R [0.60 mag] | |
---|---|---|---|
B [0.73 mag] | 0.96 (28) | ||
R [0.60 mag] | 0.96 (26) | 0.95 (17) | |
I [0.64 mag] | 0.94 (19) | 0.87 (12) | 0.95 (13) |
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) | 17.39 | 0.83 | ||
R (I|R) | 14.67 | 1.31 | 11.93 | 0.62 | |
I (I|R) | 9.84 | 1.89 | 7.87 | 1.36 | 8.40 | 1.49 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5