MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.37 | 18.11± 0.06 | - | -- | - | - | 17.83± 0.18 | - | -- | - | - | ||
56599.17 | 18.15± 0.06 | - | 18.17± 0.07 | - | 18.06± 0.06 | - | -- | - | - | |||
56976.16 | 18.06± 0.05 | - | 18.24± 0.06 | - | 17.96± 0.06 | - | -- | - | - | |||
57038.13 | 18.16± 0.05 | - | 18.15± 0.06 | - | 18.02± 0.05 | - | -- | - | - | |||
57310.13 | 18.40± 0.08 | - | 18.42± 0.09 | - | 18.33± 0.06 | - | -- | - | - | |||
57335.18 | 18.04± 0.06 | - | -- | - | - | 17.89± 0.05 | - | -- | - | - | ||
57401.10 | 18.12± 0.05 | - | 18.15± 0.06 | - | -- | - | - | -- | - | - | ||
57634.34 | 18.31± 0.05 | - | 18.36± 0.08 | - | 18.20± 0.06 | - | 18.26± 0.09 | - | ||||
57687.13 | 18.11± 0.05 | - | 18.23± 0.07 | - | 18.09± 0.05 | - | 18.44± 0.10 | - | ||||
57964.35 | 18.22± 0.05 | A | 18.22± 0.07 | A | 18.07± 0.06 | A | 18.22± 0.09 | A | ||||
58043.10 | 18.18± 0.05 | - | -- | - | - | 17.96± 0.05 | - | 18.08± 0.10 | - | |||
58045.16 | 18.04± 0.05 | A | 18.07± 0.07 | A | 17.91± 0.06 | A | -- | - | - | |||
58073.19 | 18.22± 0.05 | A | 18.24± 0.07 | A | -- | - | - | -- | - | - | ||
58103.16 | 18.10± 0.05 | A | -- | - | - | -- | - | - | 17.70± 0.08 | - | ||
58108.11 | 18.08± 0.06 | - | 18.13± 0.08 | - | -- | - | - | 18.28± 0.23 | - | |||
58312.39 | 18.00± 0.05 | - | 18.06± 0.10 | - | -- | - | - | -- | - | - | ||
58316.38 | 17.95± 0.04 | - | 18.02± 0.06 | - | 17.88± 0.04 | - | 17.97± 0.07 | - | ||||
58317.37 | 17.96± 0.05 | - | 18.03± 0.07 | - | 17.90± 0.05 | - | -- | - | - | |||
58341.34 | 18.11± 0.07 | - | -- | - | - | -- | - | - | 17.84± 0.07 | - | ||
58342.38 | 18.12± 0.06 | A | 18.15± 0.09 | A | 18.02± 0.06 | A | 18.09± 0.09 | - | ||||
58375.14 | 18.07± 0.05 | - | -- | - | - | 18.00± 0.06 | - | -- | - | - | ||
58420.08 | 18.00± 0.05 | A | 18.04± 0.07 | A | 17.98± 0.05 | - | 17.59± 0.09 | A | ||||
58433.00 | 18.05± 0.07 | - | -- | - | - | 18.09± 0.06 | - | 17.94± 0.10 | - | |||
58672.39 | 18.05± 0.09 | - | -- | - | - | 17.95± 0.06 | - | 18.04± 0.24 | - | |||
58695.36 | 18.01± 0.05 | - | 18.03± 0.06 | - | 17.90± 0.04 | - | -- | - | - | |||
58784.12 | 18.07± 0.06 | - | 18.11± 0.06 | - | -- | - | - | -- | - | - | ||
58812.22 | 18.35± 0.05 | - | -- | - | - | -- | - | - | 18.39± 0.08 | - | ||
58902.07 | 17.98± 0.04 | - | -- | - | - | 17.90± 0.05 | - | -- | - | - | ||
59059.38 | 18.03± 0.05 | - | 18.01± 0.06 | - | -- | - | - | -- | - | - | ||
59081.30 | 18.15± 0.05 | A | 18.18± 0.06 | - | 18.07± 0.04 | A | -- | - | - | |||
59084.34 | -- | - | - | -- | - | - | 18.09± 0.04 | T | -- | - | - | |
59161.07 | 18.14± 0.06 | - | 18.20± 0.07 | - | 18.05± 0.05 | - | -- | - | - | |||
59171.09 | 17.95± 0.05 | - | -- | - | - | -- | - | - | 18.16± 0.09 | - | ||
59227.08 | 17.98± 0.04 | - | 18.10± 0.04 | - | 17.89± 0.04 | - | -- | - | - | |||
59415.36 | 18.24± 0.07 | - | -- | - | - | 18.08± 0.06 | - | -- | - | - | ||
59441.39 | 17.94± 0.05 | - | 17.96± 0.06 | - | -- | - | - | -- | - | - | ||
59463.30 | 18.24± 0.08 | A | -- | - | - | -- | - | - | 18.21± 0.07 | - | ||
59523.15 | 18.19± 0.04 | - | -- | - | - | 18.08± 0.04 | - | -- | - | - | ||
59525.14 | 18.21± 0.04 | A | 18.22± 0.05 | - | 18.06± 0.06 | - | -- | - | - | |||
59546.15 | 18.00± 0.04 | - | -- | - | - | -- | - | - | 17.99± 0.06 | - | ||
59551.11 | 17.94± 0.05 | - | 18.07± 0.06 | - | -- | - | - | -- | - | - | ||
59583.15 | 18.20± 0.04 | - | -- | - | - | 18.08± 0.05 | - | -- | - | - | ||
59608.07 | 18.08± 0.05 | - | -- | - | - | -- | - | - | 18.00± 0.09 | - |
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 [0.46 mag] | B [0.46 mag] | R [0.50 mag] | |
---|---|---|---|
B [0.46 mag] | 0.85 (25) | ||
R [0.50 mag] | 0.71 (27) | 0.83 (17) | |
I [0.85 mag] | 0.30 (17) | 0.48 (7) | 0.26 (9) |
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) | 3.09 | 0.72 | ||
R (I|R) | 3.56 | 1.10 | 3.27 | 0.41 | |
I (I|R) | 3.43 | 0.86 | 3.62 | 0.58 | 2.42 | 0.80 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5