(Candidate LBV) Resolved from a trio of LGGS stars 4.5 arcseconds to the SW that combine to be 1 magnitude fainter in BV and 2 magnitudes fainter in RI.
MJD | V | * | Image | B | * | Image | R | * | Images | I | * | Images |
---|---|---|---|---|---|---|---|---|---|---|---|---|
56140.37 | 16.05± 0.05 | b | -- | - | - | 15.74± 0.06 | b | -- | - | - | ||
56599.17 | 16.04± 0.04 | Ab | 16.13± 0.04 | Ab | 15.67± 0.05 | b | -- | - | - | |||
56976.16 | 15.96± 0.04 | b | 16.09± 0.06 | b | 15.61± 0.05 | b | -- | - | - | |||
57038.13 | 16.07± 0.04 | b | 16.15± 0.05 | b | 15.71± 0.04 | b | -- | - | - | |||
57310.13 | 16.06± 0.05 | b | 16.21± 0.07 | b | 15.74± 0.04 | b | -- | - | - | |||
57335.18 | 16.05± 0.06 | b | -- | - | - | 15.65± 0.04 | b | -- | - | - | ||
57401.10 | 16.03± 0.04 | b | 16.14± 0.05 | b | -- | - | - | -- | - | - | ||
57406.10 | 15.98± 0.04 | b | 16.06± 0.03 | b | 15.59± 0.05 | b | 15.51± 0.07 | b | ||||
57634.34 | 16.18± 0.04 | b | 16.24± 0.07 | b | 15.79± 0.05 | b | 15.70± 0.06 | b | ||||
57687.13 | 16.06± 0.04 | b | 16.30± 0.06 | b | 15.65± 0.04 | b | 15.59± 0.06 | b | ||||
57964.35 | 16.10± 0.04 | Ab | 16.16± 0.06 | Ab | 15.72± 0.05 | Ab | 15.64± 0.06 | Ab | ||||
57988.41 | 16.15± 0.04 | b | 16.32± 0.04 | b | -- | - | - | -- | - | - | ||
58043.10 | 16.10± 0.04 | b | -- | - | - | 15.74± 0.04 | b | 15.63± 0.06 | b | |||
58045.16 | 16.13± 0.04 | Ab | 16.22± 0.07 | Ab | 15.74± 0.05 | Ab | -- | - | - | |||
58073.19 | 16.01± 0.04 | Ab | 16.08± 0.06 | Ab | -- | - | - | -- | - | - | ||
58103.16 | 16.13± 0.04 | Ab | 16.26± 0.04 | b | -- | - | - | 15.69± 0.06 | b | |||
58108.13 | 16.02± 0.05 | Ab | 16.10± 0.07 | Ab | -- | - | - | 15.54± 0.07 | Ab | |||
58312.39 | 16.03± 0.05 | b | 16.12± 0.07 | b | -- | - | - | -- | - | - | ||
58316.38 | 16.04± 0.03 | b | 16.13± 0.05 | b | 15.69± 0.03 | b | 15.59± 0.04 | b | ||||
58317.37 | 16.09± 0.04 | b | 16.18± 0.07 | b | 15.74± 0.04 | b | -- | - | - | |||
58341.34 | 16.13± 0.06 | b | -- | - | - | -- | - | - | 15.66± 0.07 | b | ||
58342.38 | 16.15± 0.04 | Ab | 16.25± 0.06 | Ab | 15.76± 0.04 | Ab | 15.63± 0.05 | b | ||||
58375.14 | 16.12± 0.04 | b | -- | - | - | 15.75± 0.05 | b | -- | - | - | ||
58420.08 | 15.99± 0.04 | Ab | 16.07± 0.06 | Ab | 15.68± 0.04 | b | 15.48± 0.06 | Ab | ||||
58433.00 | 16.18± 0.04 | b | -- | - | - | 15.82± 0.05 | b | 15.67± 0.06 | b | |||
58672.39 | 16.09± 0.07 | b | -- | - | - | 15.70± 0.05 | b | 15.59± 0.07 | b | |||
58673.38 | 16.29± 0.02 | b | 16.42± 0.03 | b | -- | - | - | -- | - | - | ||
58695.36 | 16.08± 0.05 | b | 16.11± 0.05 | b | 15.74± 0.04 | b | -- | - | - | |||
58696.39 | 16.07± 0.04 | b | 16.14± 0.06 | b | 15.73± 0.04 | b | -- | - | - | |||
58779.15 | 15.93± 0.04 | b | -- | - | - | 15.60± 0.05 | b | 15.45± 0.07 | b | |||
58784.12 | 16.05± 0.05 | b | 16.11± 0.05 | b | -- | - | - | -- | - | - | ||
58812.22 | 16.13± 0.05 | b | -- | - | - | -- | - | - | 15.69± 0.05 | b | ||
58902.06 | 16.08± 0.03 | Ab | -- | - | - | 15.78± 0.04 | b | 15.61± 0.07 | b | |||
59056.38 | 16.09± 0.04 | b | 16.22± 0.06 | b | 15.74± 0.04 | b | 15.65± 0.07 | b | ||||
59059.38 | 16.07± 0.05 | b | 16.12± 0.06 | b | -- | - | - | -- | - | - | ||
59081.30 | 16.10± 0.04 | Ab | 16.14± 0.06 | b | 15.76± 0.04 | Ab | -- | - | - | |||
59082.34 | 16.06± 0.03 | Ab | 16.13± 0.05 | Ab | 15.71± 0.05 | Ab | -- | - | - | |||
59084.31 | -- | - | - | -- | - | - | 15.70± 0.05 | Tb | -- | - | - | |
59161.09 | 16.19± 0.04 | Ab | 16.28± 0.05 | Ab | 15.82± 0.04 | Ab | -- | - | - | |||
59171.09 | 16.17± 0.04 | Ab | 16.25± 0.05 | Ab | 15.73± 0.05 | b | 15.69± 0.07 | Ab | ||||
59227.08 | 16.18± 0.03 | Ab | 16.26± 0.04 | Ab | 15.81± 0.05 | Ab | -- | - | - | |||
59415.37 | 16.12± 0.04 | Ab | 16.27± 0.03 | b | 15.76± 0.04 | b | -- | - | - | |||
59441.40 | 16.14± 0.05 | Ab | 16.23± 0.06 | b | 15.77± 0.05 | b | 15.64± 0.07 | b | ||||
59442.39 | 16.19± 0.02 | b | -- | - | - | 15.83± 0.05 | b | 15.71± 0.07 | b | |||
59463.28 | 16.03± 0.04 | Ab | 16.08± 0.06 | b | -- | - | - | 15.65± 0.05 | b | |||
59523.16 | 16.11± 0.03 | Ab | 16.21± 0.02 | b | 15.75± 0.04 | b | -- | - | - | |||
59525.15 | 16.11± 0.03 | Ab | 16.19± 0.05 | b | 15.71± 0.05 | b | 15.66± 0.09 | b | ||||
59546.18 | 16.05± 0.03 | Ab | 16.09± 0.06 | b | 15.75± 0.04 | b | 15.64± 0.05 | b | ||||
59551.12 | 16.05± 0.04 | Ab | 16.15± 0.04 | Ab | -- | - | - | 15.54± 0.08 | b | |||
59583.16 | 16.13± 0.04 | Ab | 16.12± 0.06 | b | 15.78± 0.05 | b | 15.69± 0.08 | b | ||||
59608.09 | 16.07± 0.04 | Ab | -- | - | - | 15.69± 0.05 | Ab | 15.62± 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 [0.36 mag] | B [0.35 mag] | R [0.24 mag] | |
---|---|---|---|
B [0.36 mag] | 0.72 (38) | ||
R [0.24 mag] | 0.77 (37) | 0.28 (27) | |
I [0.26 mag] | 0.80 (26) | 0.30 (17) | 0.70 (20) |
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) | 3.28 | 1.06 | ||
R (I|R) | 1.82 | 1.26 | 1.77 | 0.12 | |
I (I|R) | 1.52 | 1.70 | 0.93 | 1.55 | 1.20 | 1.42 |
By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory
Generated on 2023-08-14 14:15:12 UT-5