MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56982.22 | 17.37± 0.06 | - | 18.03± 0.06 | - | 16.82± 0.07 | - | -- | - | - | |||
57328.19 | 17.47± 0.05 | - | 18.13± 0.07 | - | 16.92± 0.07 | - | -- | - | - | |||
57401.10 | 17.50± 0.05 | - | 18.14± 0.06 | - | -- | - | - | -- | - | - | ||
57406.10 | 17.45± 0.06 | - | 18.19± 0.09 | - | 16.94± 0.05 | - | 16.49± 0.07 | - | ||||
57634.41 | 17.39± 0.06 | - | 18.00± 0.08 | - | 16.83± 0.08 | - | -- | - | - | |||
57638.43 | 17.39± 0.06 | - | -- | - | - | -- | - | - | 16.34± 0.10 | - | ||
57964.33 | 17.48± 0.05 | - | 18.10± 0.07 | - | 16.89± 0.05 | - | 16.28± 0.06 | - | ||||
58045.18 | 17.52± 0.05 | - | 18.15± 0.08 | - | 16.95± 0.06 | - | -- | - | - | |||
58073.20 | 17.44± 0.05 | - | 18.15± 0.07 | - | -- | - | - | -- | - | - | ||
58103.18 | 17.40± 0.05 | T | -- | - | - | -- | - | - | -- | - | - | |
58108.11 | 17.41± 0.05 | - | 18.18± 0.09 | - | -- | - | - | 16.35± 0.07 | - | |||
58312.39 | 17.45± 0.05 | - | 18.19± 0.11 | - | -- | - | - | -- | - | - | ||
58317.37 | 17.49± 0.05 | - | 18.20± 0.07 | - | 16.92± 0.04 | - | -- | - | - | |||
58341.34 | 17.47± 0.07 | - | -- | - | - | -- | - | - | 16.35± 0.07 | - | ||
58342.40 | 17.48± 0.06 | - | 18.16± 0.09 | - | 16.94± 0.05 | - | -- | - | - | |||
58375.14 | 17.50± 0.05 | - | -- | - | - | 16.94± 0.05 | - | -- | - | - | ||
58420.10 | 17.56± 0.05 | - | 18.24± 0.07 | - | -- | - | - | 16.46± 0.07 | - | |||
58672.39 | 17.38± 0.07 | - | -- | - | - | 16.81± 0.05 | - | 16.35± 0.08 | - | |||
58695.36 | 17.38± 0.05 | - | 18.08± 0.06 | - | 16.81± 0.04 | - | -- | - | - | |||
58696.41 | 17.44± 0.05 | - | 18.13± 0.08 | - | 16.82± 0.07 | - | -- | - | - | |||
58757.17 | 17.30± 0.05 | - | -- | - | - | 16.79± 0.05 | - | -- | - | - | ||
58784.14 | 17.33± 0.05 | A | 17.91± 0.06 | - | -- | - | - | 16.30± 0.08 | - | |||
59059.38 | 17.25± 0.05 | - | 17.97± 0.06 | - | -- | - | - | -- | - | - | ||
59081.26 | 17.27± 0.05 | - | -- | - | - | 16.72± 0.05 | - | -- | - | - | ||
59084.38 | -- | - | - | -- | - | - | 16.74± 0.07 | T | -- | - | - | |
59161.07 | 17.27± 0.05 | - | 18.04± 0.07 | - | 16.71± 0.04 | - | -- | - | - | |||
59171.17 | 17.39± 0.04 | - | 18.07± 0.09 | - | 16.78± 0.05 | - | 16.23± 0.08 | - | ||||
59227.15 | 17.32± 0.05 | - | 18.04± 0.06 | - | 16.74± 0.04 | - | 16.20± 0.07 | - | ||||
59441.40 | 17.29± 0.06 | A | 17.97± 0.06 | - | -- | - | - | -- | - | - | ||
59463.34 | 17.30± 0.06 | - | 17.99± 0.08 | - | -- | - | - | -- | - | - | ||
59522.13 | 17.32± 0.05 | - | -- | - | - | 16.73± 0.05 | - | 16.24± 0.08 | - | |||
59546.22 | 17.28± 0.06 | - | -- | - | - | -- | - | - | 16.18± 0.07 | - | ||
59551.16 | 17.25± 0.07 | T | -- | - | - | -- | - | - | -- | - | - | |
59608.14 | 17.31± 0.05 | - | 18.07± 0.08 | - | 16.75± 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 [0.33 mag] | B [0.30 mag] | R [0.23 mag] | |
---|---|---|---|
B [0.33 mag] | 0.68 (23) | ||
R [0.23 mag] | 0.90 (19) | 0.59 (14) | |
I [0.30 mag] | 0.57 (12) | 0.48 (7) | 0.68 (6) |
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) | 1.78 | 0.71 | ||
R (I|R) | 2.57 | 0.99 | -0.74 | 0.03 | |
I (I|R) | 1.54 | 1.17 | 1.55 | 0.99 | 1.80 | 1.20 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5