MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.40 | 17.35± 0.05 | - | -- | - | - | 16.92± 0.08 | - | -- | - | - | ||
56599.22 | 17.55± 0.07 | - | 18.32± 0.06 | - | 17.09± 0.06 | - | -- | - | - | |||
57035.14 | 17.48± 0.04 | - | 18.34± 0.06 | - | 17.05± 0.05 | - | -- | - | - | |||
57310.16 | 17.38± 0.05 | - | 18.09± 0.05 | - | 16.93± 0.05 | - | -- | - | - | |||
57328.16 | 17.40± 0.03 | - | 18.15± 0.04 | - | 16.95± 0.04 | - | -- | - | - | |||
57406.10 | 17.32± 0.05 | - | 17.90± 0.07 | - | 16.88± 0.05 | - | 16.44± 0.07 | - | ||||
57634.41 | 17.11± 0.06 | - | 17.77± 0.08 | - | 16.72± 0.08 | - | -- | - | - | |||
57638.40 | 17.27± 0.05 | A | 17.93± 0.04 | - | 16.85± 0.03 | - | 16.48± 0.08 | A | ||||
57964.40 | 17.39± 0.04 | - | -- | - | - | -- | - | - | 16.57± 0.07 | A | ||
57988.43 | 17.21± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
58043.13 | 17.33± 0.04 | - | 18.06± 0.04 | - | 16.77± 0.07 | - | -- | - | - | |||
58073.22 | 17.43± 0.05 | - | 18.33± 0.05 | - | -- | - | - | -- | - | - | ||
58108.13 | 17.46± 0.05 | A | 18.24± 0.05 | A | -- | - | - | 16.57± 0.08 | A | |||
58316.35 | 17.39± 0.04 | - | 18.17± 0.04 | - | -- | - | - | -- | - | - | ||
58339.40 | 17.36± 0.05 | - | 18.16± 0.07 | - | 16.88± 0.06 | - | -- | - | - | |||
58341.37 | 17.46± 0.04 | - | -- | - | - | -- | - | - | 16.54± 0.08 | - | ||
58373.15 | 17.43± 0.06 | - | 18.29± 0.08 | - | -- | - | - | -- | - | - | ||
58375.16 | 17.34± 0.05 | - | -- | - | - | -- | - | - | 16.47± 0.09 | - | ||
58433.02 | 17.38± 0.05 | - | -- | - | - | 16.94± 0.05 | - | 16.68± 0.10 | - | |||
58673.38 | 17.27± 0.03 | - | 18.02± 0.04 | - | -- | - | - | -- | - | - | ||
58695.39 | 17.28± 0.05 | - | -- | - | - | 16.85± 0.04 | - | -- | - | - | ||
58750.20 | 17.36± 0.04 | A | 18.16± 0.03 | - | 16.90± 0.05 | - | 16.58± 0.08 | - | ||||
58757.17 | 17.37± 0.05 | - | -- | - | - | 16.94± 0.05 | - | -- | - | - | ||
58779.18 | 17.41± 0.04 | - | 18.12± 0.04 | - | -- | - | - | -- | - | - | ||
58784.14 | 17.43± 0.04 | - | -- | - | - | 16.98± 0.04 | - | -- | - | - | ||
58812.20 | 17.34± 0.06 | - | -- | - | - | 16.90± 0.06 | - | -- | - | - | ||
59059.40 | 17.55± 0.06 | - | -- | - | - | 17.05± 0.05 | - | 16.66± 0.08 | - | |||
59081.34 | 17.32± 0.05 | A | 18.03± 0.05 | A | 16.89± 0.05 | A | 16.50± 0.07 | - | ||||
59082.38 | 17.34± 0.05 | - | 18.06± 0.03 | - | 16.88± 0.04 | - | -- | - | - | |||
59084.25 | -- | - | - | -- | - | - | 16.88± 0.04 | T | -- | - | - | |
59161.14 | 17.43± 0.04 | - | -- | - | - | 16.98± 0.04 | - | 16.59± 0.09 | - | |||
59171.15 | 17.39± 0.05 | A | 18.11± 0.07 | A | 16.95± 0.05 | - | 16.57± 0.07 | A | ||||
59227.14 | 17.34± 0.05 | A | 18.06± 0.05 | A | 16.91± 0.05 | A | 16.46± 0.07 | - | ||||
59415.39 | 17.46± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
59441.42 | 17.40± 0.06 | T | -- | - | - | -- | - | - | -- | - | - | |
59442.41 | 17.44± 0.05 | - | -- | - | - | 16.94± 0.04 | - | -- | - | - | ||
59463.33 | 17.37± 0.05 | A | 18.09± 0.06 | A | -- | - | - | 16.54± 0.07 | - | |||
59522.13 | 17.46± 0.05 | - | -- | - | - | 16.97± 0.05 | - | 16.55± 0.08 | - | |||
59525.12 | 17.46± 0.05 | - | -- | - | - | 17.00± 0.04 | - | -- | - | - | ||
59546.20 | 17.44± 0.05 | A | 18.24± 0.03 | - | -- | - | - | 16.56± 0.07 | - | |||
59551.14 | 17.46± 0.06 | A | -- | - | - | -- | - | - | 16.66± 0.08 | - | ||
59583.20 | 17.43± 0.04 | - | -- | - | - | 16.95± 0.05 | - | -- | - | - | ||
59608.14 | 17.33± 0.05 | - | 18.01± 0.08 | - | 16.94± 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 [0.57 mag] | B [0.44 mag] | R [0.37 mag] | |
---|---|---|---|
B [0.57 mag] | 0.83 (23) | ||
R [0.37 mag] | 0.84 (27) | 0.68 (15) | |
I [0.24 mag] | 0.45 (17) | 0.70 (9) | 0.55 (10) |
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) | 3.56 | 1.58 | ||
R (I|R) | 2.17 | 1.12 | 5.21 | 0.07 | |
I (I|R) | 0.78 | 1.73 | 1.34 | 3.48 | 0.94 | 1.30 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5