MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.37 | 17.05± 0.05 | - | -- | - | - | 16.86± 0.08 | - | -- | - | - | ||
56599.17 | 16.94± 0.05 | - | 17.02± 0.06 | - | 16.75± 0.05 | - | -- | - | - | |||
56976.16 | 17.01± 0.04 | - | 17.13± 0.06 | - | 16.84± 0.05 | - | -- | - | - | |||
56982.22 | 16.99± 0.06 | - | 17.08± 0.06 | - | 16.84± 0.07 | - | -- | - | - | |||
57038.13 | 17.10± 0.04 | - | 17.16± 0.05 | - | 16.93± 0.04 | - | -- | - | - | |||
57310.13 | 17.00± 0.05 | - | 17.10± 0.07 | - | 16.79± 0.05 | - | -- | - | - | |||
57328.19 | 16.90± 0.05 | - | 16.98± 0.07 | - | 16.75± 0.07 | - | -- | - | - | |||
57335.18 | 16.95± 0.06 | - | -- | - | - | 16.78± 0.04 | - | -- | - | - | ||
57401.10 | 17.02± 0.04 | - | 17.11± 0.05 | - | -- | - | - | -- | - | - | ||
57634.34 | 16.97± 0.04 | - | 17.11± 0.07 | - | 16.85± 0.05 | - | 16.64± 0.06 | - | ||||
57638.43 | 16.94± 0.06 | - | -- | - | - | -- | - | - | 16.56± 0.10 | - | ||
57687.13 | 17.09± 0.04 | - | 17.24± 0.06 | - | 16.90± 0.04 | - | 16.74± 0.06 | - | ||||
57964.33 | 17.01± 0.04 | - | 17.07± 0.07 | - | 16.85± 0.05 | - | 16.72± 0.06 | - | ||||
58045.18 | 16.99± 0.05 | - | 17.07± 0.07 | - | 16.81± 0.06 | - | -- | - | - | |||
58073.20 | 17.03± 0.04 | - | 17.09± 0.07 | - | -- | - | - | -- | - | - | ||
58103.18 | 16.98± 0.05 | T | -- | - | - | -- | - | - | -- | - | - | |
58108.11 | 16.92± 0.05 | - | 17.00± 0.08 | - | -- | - | - | 16.44± 0.07 | - | |||
58312.39 | 16.84± 0.05 | - | 16.94± 0.07 | - | -- | - | - | -- | - | - | ||
58317.37 | 16.86± 0.04 | - | 16.95± 0.07 | - | 16.67± 0.04 | - | -- | - | - | |||
58341.34 | 16.95± 0.06 | - | -- | - | - | -- | - | - | 16.60± 0.07 | - | ||
58342.40 | 17.01± 0.05 | - | 17.09± 0.07 | - | 16.87± 0.05 | - | -- | - | - | |||
58375.14 | 16.89± 0.04 | - | -- | - | - | 16.74± 0.05 | - | -- | - | - | ||
58420.08 | 17.05± 0.04 | A | 17.14± 0.06 | A | 16.79± 0.04 | - | 16.70± 0.07 | A | ||||
58433.00 | 16.95± 0.05 | - | -- | - | - | 16.75± 0.05 | - | 16.66± 0.06 | - | |||
58672.39 | 16.94± 0.07 | - | -- | - | - | 16.74± 0.05 | - | 16.64± 0.09 | - | |||
58695.36 | 16.85± 0.05 | - | 16.96± 0.05 | - | 16.67± 0.04 | - | -- | - | - | |||
58784.12 | 16.88± 0.05 | - | 16.96± 0.05 | - | -- | - | - | -- | - | - | ||
58812.22 | 16.94± 0.05 | - | -- | - | - | -- | - | - | 16.58± 0.05 | - | ||
58902.07 | 16.84± 0.04 | - | -- | - | - | 16.68± 0.04 | - | -- | - | - | ||
59059.38 | 16.90± 0.05 | - | 16.98± 0.05 | - | -- | - | - | -- | - | - | ||
59081.26 | 16.92± 0.05 | - | -- | - | - | 16.75± 0.05 | - | -- | - | - | ||
59084.34 | -- | - | - | -- | - | - | 16.70± 0.04 | T | -- | - | - | |
59161.07 | 16.88± 0.05 | - | 16.98± 0.06 | - | 16.70± 0.04 | - | -- | - | - | |||
59171.09 | 16.81± 0.05 | - | -- | - | - | -- | - | - | 16.47± 0.06 | - | ||
59227.08 | 16.82± 0.04 | - | 16.99± 0.04 | - | 16.63± 0.04 | - | -- | - | - | |||
59415.36 | 16.86± 0.04 | - | -- | - | - | 16.68± 0.04 | - | -- | - | - | ||
59441.39 | 16.89± 0.05 | - | 17.03± 0.06 | - | -- | - | - | -- | - | - | ||
59463.30 | 16.88± 0.04 | A | -- | - | - | -- | - | - | 16.52± 0.05 | - | ||
59523.15 | 16.88± 0.04 | - | -- | - | - | 16.69± 0.04 | - | -- | - | - | ||
59525.15 | 16.85± 0.04 | - | 16.96± 0.04 | - | -- | - | - | -- | - | - | ||
59546.15 | 16.84± 0.04 | - | -- | - | - | -- | - | - | 16.40± 0.05 | - | ||
59551.11 | 16.79± 0.04 | - | 16.95± 0.05 | - | -- | - | - | -- | - | - | ||
59583.15 | 16.83± 0.04 | - | -- | - | - | 16.62± 0.04 | - | -- | - | - | ||
59608.07 | 16.84± 0.04 | - | -- | - | - | -- | - | - | 16.48± 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 [0.30 mag] | B [0.31 mag] | R [0.30 mag] | |
---|---|---|---|
B [0.30 mag] | 0.88 (25) | ||
R [0.30 mag] | 0.91 (26) | 0.76 (16) | |
I [0.34 mag] | 0.78 (14) | 0.64 (5) | 0.42 (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) | 2.55 | 0.70 | ||
R (I|R) | 3.33 | 1.05 | 2.32 | 0.19 | |
I (I|R) | 3.04 | 0.89 | 1.51 | 0.75 | 0.49 | 1.82 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5