MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56599.13 | 16.94± 0.03 | - | 17.21± 0.04 | - | 16.63± 0.04 | - | -- | - | - | |||
56951.10 | 16.95± 0.04 | - | 17.28± 0.03 | - | 16.68± 0.05 | - | -- | - | - | |||
57307.15 | 16.94± 0.03 | - | 17.21± 0.03 | - | 16.69± 0.03 | - | -- | - | - | |||
57634.30 | -- | - | - | 17.32± 0.04 | T | 16.75± 0.06 | T | -- | - | - | ||
57638.23 | 16.99± 0.05 | - | 17.30± 0.05 | - | 16.72± 0.07 | - | 16.49± 0.07 | - | ||||
57958.38 | 17.20± 0.03 | - | -- | - | - | 16.92± 0.04 | - | 16.63± 0.04 | - | |||
57963.30 | 17.15± 0.03 | - | 17.38± 0.03 | - | -- | - | - | -- | - | - | ||
58045.10 | 17.27± 0.03 | - | 17.51± 0.04 | - | 17.04± 0.04 | - | -- | - | - | |||
58067.14 | 17.13± 0.03 | - | -- | - | - | -- | - | - | 16.63± 0.04 | - | ||
58103.11 | 17.08± 0.04 | - | 17.30± 0.05 | - | -- | - | - | 16.67± 0.05 | - | |||
58316.30 | 17.08± 0.04 | - | 17.36± 0.04 | - | 16.84± 0.04 | - | -- | - | - | |||
58317.24 | 17.12± 0.04 | - | -- | - | - | -- | - | - | 16.57± 0.04 | - | ||
58342.23 | 17.04± 0.03 | - | 17.34± 0.04 | - | -- | - | - | 16.51± 0.04 | - | |||
58372.13 | 17.12± 0.03 | - | -- | - | - | -- | - | - | 16.62± 0.04 | - | ||
58433.06 | 17.13± 0.03 | - | 17.45± 0.03 | - | 16.88± 0.03 | - | -- | - | - | |||
58672.29 | 17.08± 0.03 | - | 17.40± 0.04 | - | -- | - | - | -- | - | - | ||
58695.24 | 17.15± 0.03 | - | -- | - | - | 16.90± 0.03 | - | 16.65± 0.04 | - | |||
58757.06 | 17.11± 0.03 | - | -- | - | - | 16.84± 0.03 | - | -- | - | - | ||
58784.02 | 17.02± 0.04 | - | 17.30± 0.04 | - | -- | - | - | -- | - | - | ||
58836.09 | 16.98± 0.03 | A | -- | - | - | 16.69± 0.03 | - | 16.44± 0.04 | - | |||
59001.40 | 17.05± 0.05 | T | -- | - | - | -- | - | - | -- | - | - | |
59026.34 | 17.07± 0.04 | A | -- | - | - | 16.81± 0.06 | - | -- | - | - | ||
59059.29 | 17.09± 0.04 | - | 17.37± 0.04 | - | -- | - | - | 16.56± 0.06 | - | |||
59082.29 | 17.11± 0.04 | - | 17.40± 0.04 | - | 16.84± 0.05 | - | -- | - | - | |||
59131.15 | 16.99± 0.04 | - | -- | - | - | 16.74± 0.04 | - | -- | - | - | ||
59166.21 | 17.11± 0.04 | - | -- | - | - | -- | - | - | 16.66± 0.07 | - | ||
59194.16 | 17.21± 0.03 | - | 17.52± 0.04 | - | -- | - | - | -- | - | - | ||
59380.34 | 17.06± 0.04 | - | 17.32± 0.04 | - | -- | - | - | -- | - | - | ||
59415.32 | 16.98± 0.05 | - | -- | - | - | 16.70± 0.06 | - | -- | - | - | ||
59441.33 | 17.07± 0.04 | - | -- | - | - | -- | - | - | 16.51± 0.06 | A | ||
59483.11 | 16.95± 0.04 | - | 17.27± 0.04 | - | -- | - | - | -- | - | - | ||
59523.04 | 17.08± 0.04 | - | -- | - | - | 16.79± 0.05 | - | 16.47± 0.07 | - | |||
59548.09 | 16.86± 0.04 | - | 17.13± 0.04 | - | -- | - | - | -- | - | - | ||
59794.27 | 17.01± 0.04 | - | 17.28± 0.04 | - | -- | - | - | -- | - | - | ||
59823.20 | 17.11± 0.04 | - | -- | - | - | 16.83± 0.05 | - | -- | - | - | ||
59849.12 | 17.08± 0.03 | - | -- | - | - | -- | - | - | 16.59± 0.07 | - | ||
59904.08 | 17.04± 0.03 | - | -- | - | - | 16.75± 0.04 | - | 16.52± 0.06 | - | |||
59932.05 | 17.03± 0.05 | - | 17.30± 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 [0.40 mag] | B [0.40 mag] | R [0.41 mag] | |
---|---|---|---|
B [0.40 mag] | 0.90 (20) | ||
R [0.41 mag] | 0.97 (18) | 0.92 (9) | |
I [0.23 mag] | 0.59 (15) | 0.06 (4) | 0.86 (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) | 7.56 | 0.96 | ||
R (I|R) | 7.76 | 1.06 | 7.69 | 0.18 | |
I (I|R) | 2.49 | 1.05 | --- | --- | 5.35 | 1.31 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5