In a crowd with many LGGS star >4 magnitudes fainter around it.
MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.38 | 16.20± 0.04 | Ab | -- | - | - | 15.91± 0.07 | Ab | -- | - | - | ||
56593.16 | 16.09± 0.03 | b | 16.36± 0.02 | b | -- | - | - | -- | - | - | ||
56599.18 | 16.13± 0.04 | Ab | 16.34± 0.04 | Ab | 15.79± 0.05 | Ab | -- | - | - | |||
56976.18 | 16.29± 0.04 | Ab | 16.49± 0.05 | Ab | 15.98± 0.06 | Ab | -- | - | - | |||
57310.13 | 16.43± 0.05 | b | 17.03± 0.07 | X | 16.13± 0.05 | b | -- | - | - | |||
57328.16 | 16.55± 0.03 | b | 16.61± 0.04 | b | 16.22± 0.04 | b | -- | - | - | |||
57335.18 | 16.52± 0.06 | b | -- | - | - | 16.08± 0.04 | b | -- | - | - | ||
57401.10 | 16.53± 0.04 | b | 16.67± 0.05 | b | -- | - | - | -- | - | - | ||
57406.10 | 16.57± 0.04 | b | 16.75± 0.04 | b | 16.17± 0.05 | b | 15.99± 0.07 | b | ||||
57634.36 | 16.62± 0.04 | Ab | 16.66± 0.06 | Ab | 16.30± 0.06 | Ab | 16.22± 0.07 | Ab | ||||
57687.13 | 16.50± 0.04 | b | 16.72± 0.06 | b | 16.31± 0.04 | b | 16.20± 0.06 | b | ||||
57964.35 | 16.38± 0.04 | Ab | 16.55± 0.06 | Ab | 16.22± 0.05 | Ab | 16.25± 0.06 | Ab | ||||
57988.41 | 16.39± 0.04 | b | 16.64± 0.04 | b | -- | - | - | -- | - | - | ||
58043.10 | 16.27± 0.04 | b | -- | - | - | 16.01± 0.04 | b | 16.01± 0.06 | b | |||
58045.16 | 16.28± 0.04 | Ab | 16.71± 0.09 | Ab | 15.88± 0.05 | Ab | -- | - | - | |||
58073.19 | 16.24± 0.04 | Ab | 16.35± 0.06 | Ab | -- | - | - | -- | - | - | ||
58103.16 | 16.16± 0.04 | Ab | 16.43± 0.04 | b | -- | - | - | 15.89± 0.06 | b | |||
58108.13 | 16.19± 0.05 | Ab | 16.38± 0.07 | Ab | -- | - | - | 15.88± 0.07 | Ab | |||
58312.39 | 16.26± 0.05 | b | 16.54± 0.07 | b | -- | - | - | -- | - | - | ||
58317.37 | 16.26± 0.04 | b | 16.42± 0.07 | b | 15.97± 0.04 | b | -- | - | - | |||
58341.34 | 16.47± 0.06 | b | -- | - | - | -- | - | - | 16.03± 0.07 | b | ||
58342.40 | 16.37± 0.05 | b | 16.51± 0.07 | b | 16.07± 0.05 | b | -- | - | - | |||
58375.14 | 16.36± 0.04 | b | -- | - | - | 16.07± 0.05 | b | -- | - | - | ||
58420.10 | 16.24± 0.04 | b | 16.41± 0.06 | b | -- | - | - | 16.02± 0.07 | b | |||
58433.00 | 16.42± 0.04 | b | -- | - | - | 16.09± 0.05 | b | 16.06± 0.06 | b | |||
58672.39 | 16.26± 0.07 | b | -- | - | - | 16.04± 0.05 | b | 15.99± 0.08 | b | |||
58673.38 | 16.45± 0.03 | b | 16.66± 0.03 | b | -- | - | - | -- | - | - | ||
58695.36 | 16.35± 0.05 | b | 16.53± 0.05 | b | 16.10± 0.04 | b | -- | - | - | |||
58750.19 | 16.43± 0.03 | b | -- | - | - | 16.08± 0.05 | b | -- | - | - | ||
58779.18 | 16.32± 0.04 | b | 16.67± 0.04 | b | -- | - | - | -- | - | - | ||
58784.12 | 16.34± 0.06 | b | 16.59± 0.05 | b | -- | - | - | -- | - | - | ||
58812.22 | 16.46± 0.05 | b | -- | - | - | -- | - | - | 15.83± 0.05 | b | ||
58902.06 | 16.50± 0.04 | Ab | -- | - | - | 16.02± 0.05 | b | 16.22± 0.07 | b | |||
59056.38 | 16.66± 0.05 | b | 16.85± 0.06 | b | 16.53± 0.04 | b | 16.11± 0.08 | b | ||||
59059.38 | 16.68± 0.05 | b | 16.81± 0.06 | b | -- | - | - | -- | - | - | ||
59081.26 | 16.61± 0.05 | b | -- | - | - | 16.31± 0.05 | b | -- | - | - | ||
59082.32 | 16.74± 0.03 | b | 16.93± 0.03 | b | 16.41± 0.04 | b | -- | - | - | |||
59084.29 | -- | - | - | -- | - | - | 16.26± 0.06 | Tb | -- | - | - | |
59161.09 | 16.50± 0.04 | Ab | 16.75± 0.05 | Ab | 16.25± 0.05 | Ab | -- | - | - | |||
59171.11 | 16.62± 0.04 | Ab | 16.66± 0.04 | b | -- | - | - | 16.09± 0.07 | Ab | |||
59227.09 | 16.65± 0.03 | Ab | 16.64± 0.04 | Ab | 16.45± 0.04 | b | -- | - | - | |||
59415.37 | 16.62± 0.04 | A | 16.83± 0.03 | b | 16.28± 0.04 | b | -- | - | - | |||
59441.39 | 16.66± 0.05 | b | 16.65± 0.06 | b | -- | - | - | -- | - | - | ||
59442.39 | 16.57± 0.02 | b | -- | - | - | 16.18± 0.05 | b | 15.97± 0.08 | b | |||
59463.30 | 16.54± 0.04 | Ab | -- | - | - | -- | - | - | 15.93± 0.05 | - | ||
59523.16 | 16.29± 0.03 | Ab | 16.52± 0.02 | b | 15.94± 0.04 | b | -- | - | - | |||
59525.16 | 16.32± 0.04 | Ab | 16.46± 0.05 | b | -- | - | - | 15.97± 0.09 | b | |||
59546.16 | 16.30± 0.03 | Ab | -- | - | - | 16.04± 0.05 | b | 15.88± 0.05 | b | |||
59551.13 | 16.36± 0.04 | Ab | 16.56± 0.04 | Ab | -- | - | - | -- | - | - | ||
59583.15 | 16.25± 0.03 | Ab | -- | - | - | 15.93± 0.05 | b | 15.73± 0.08 | b | |||
59608.08 | 16.24± 0.03 | Ab | -- | - | - | 15.88± 0.04 | b | 15.94± 0.05 | b |
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 [0.58 mag] | B [0.66 mag] | R [0.73 mag] | |
---|---|---|---|
B [0.58 mag] | 0.73 (33) | ||
R [0.73 mag] | 0.81 (31) | 0.54 (17) | |
I [0.52 mag] | 0.26 (21) | 0.32 (10) | 0.34 (13) |
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) | 16.00 | 0.72 | ||
R (I|R) | 14.37 | 1.17 | 13.48 | 0.29 | |
I (I|R) | 3.95 | 2.10 | 3.15 | 1.66 | 5.09 | 1.62 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5