Color composite thumbnail image of Var CVar C (J013335.14+303600.4)



Target Notes

Color composite thumbnail image of Var_C

Classification: LBV

In a crowd but >3 magnitudes brighter than all around it.

Find In Simbad Query LGGS Massey (2016) at VizieR Query CAT WISE (Eisenhardt et al., 2020) at VizieR Query Gaia EDR3 (2020) at VizieR LBT Spectra @UMN
Query M33 Variability Hartman et al. Survey (2006) at VizieR


Photometry Table

Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability
MJDV*ImageB*ImageR*ImagesI*Images
56140.39 15.61± 0.03bVar_C in filter V on MJD  56140.390
---- 15.37± 0.07bVar_C in filter R on MJD  56140.390
----
56593.16 15.64± 0.03bVar_C in filter V on MJD  56593.160
15.82± 0.02bVar_C in filter B on MJD  56593.160
--------
56599.19 15.63± 0.04bVar_C in filter V on MJD  56599.190
15.82± 0.03bVar_C in filter B on MJD  56599.190
15.35± 0.06bVar_C in filter R on MJD  56599.190
----
56976.19 15.55± 0.04bVar_C in filter V on MJD  56976.190
15.84± 0.04bVar_C in filter B on MJD  56976.190
15.30± 0.06bVar_C in filter R on MJD  56976.190
----
57035.14 15.49± 0.04bVar_C in filter V on MJD  57035.140
15.74± 0.03bVar_C in filter B on MJD  57035.140
15.23± 0.04bVar_C in filter R on MJD  57035.140
----
57310.16 15.69± 0.05bVar_C in filter V on MJD  57310.160
15.83± 0.04bVar_C in filter B on MJD  57310.160
15.46± 0.05bVar_C in filter R on MJD  57310.160
----
57328.16 15.78± 0.03bVar_C in filter V on MJD  57328.160
15.97± 0.04bVar_C in filter B on MJD  57328.160
15.52± 0.04bVar_C in filter R on MJD  57328.160
----
57406.10 15.93± 0.04bVar_C in filter V on MJD  57406.100
16.09± 0.03bVar_C in filter B on MJD  57406.100
15.71± 0.04bVar_C in filter R on MJD  57406.100
15.49± 0.07bVar_C in filter I on MJD  57406.100
57634.38 16.26± 0.04bVar_C in filter V on MJD  57634.380
16.42± 0.05bVar_C in filter B on MJD  57634.380
16.01± 0.06bVar_C in filter R on MJD  57634.380
15.83± 0.09bVar_C in filter I on MJD  57634.380
57638.39---- 16.35± 0.04TbVar_C in filter B on MJD  57638.390
15.97± 0.03TbVar_C in filter R on MJD  57638.390
15.79± 0.07TbVar_C in filter I on MJD  57638.390
57964.36 16.68± 0.04AbVar_C in filter V on MJD  57964.360
Var_C in filter V on MJD  57964.360
16.63± 0.07bVar_C in filter B on MJD  57964.360
16.38± 0.05bVar_C in filter R on MJD  57964.360
16.35± 0.07AbVar_C in filter I on MJD  57964.360
Var_C in filter I on MJD  57964.360
Var_C in filter I on MJD  57964.360
58043.11 16.65± 0.04AbVar_C in filter V on MJD  58043.110
Var_C in filter V on MJD  58043.110
16.73± 0.04bVar_C in filter B on MJD  58043.110
16.41± 0.04AbVar_C in filter R on MJD  58043.110
Var_C in filter R on MJD  58043.110
16.21± 0.07bVar_C in filter I on MJD  58043.110
58073.21 16.57± 0.04AbVar_C in filter V on MJD  58073.210
Var_C in filter V on MJD  58073.210
16.66± 0.06AbVar_C in filter B on MJD  58073.210
Var_C in filter B on MJD  58073.210
--------
58103.17 16.61± 0.05AbVar_C in filter V on MJD  58103.170
Var_C in filter V on MJD  58103.170
16.72± 0.04bVar_C in filter B on MJD  58103.170
--------
58108.11 16.65± 0.05AbVar_C in filter V on MJD  58108.110
Var_C in filter V on MJD  58108.110
Var_C in filter V on MJD  58108.110
16.70± 0.06AbVar_C in filter B on MJD  58108.110
Var_C in filter B on MJD  58108.110
Var_C in filter B on MJD  58108.110
---- 16.30± 0.07AbVar_C in filter I on MJD  58108.110
Var_C in filter I on MJD  58108.110
Var_C in filter I on MJD  58108.110
58312.39 16.61± 0.05bVar_C in filter V on MJD  58312.390
16.68± 0.07bVar_C in filter B on MJD  58312.390
--------
58316.35 16.61± 0.06bVar_C in filter V on MJD  58316.350
16.82± 0.04bVar_C in filter B on MJD  58316.350
--------
58317.37 16.57± 0.04bVar_C in filter V on MJD  58317.370
16.59± 0.06bVar_C in filter B on MJD  58317.370
Var_C in filter B on MJD  58317.370
16.35± 0.04bVar_C in filter R on MJD  58317.370
----
58341.36 16.58± 0.06AbVar_C in filter V on MJD  58341.360
Var_C in filter V on MJD  58341.360
-------- 16.23± 0.08AbVar_C in filter I on MJD  58341.360
Var_C in filter I on MJD  58341.360
58342.40 16.44± 0.04bVar_C in filter V on MJD  58342.400
16.49± 0.06bVar_C in filter B on MJD  58342.400
16.24± 0.05bVar_C in filter R on MJD  58342.400
----
58373.15 16.51± 0.06bVar_C in filter V on MJD  58373.150
16.66± 0.06bVar_C in filter B on MJD  58373.150
--------
58375.14 16.50± 0.04bVar_C in filter V on MJD  58375.140
---- 16.31± 0.05bVar_C in filter R on MJD  58375.140
----
58420.10 16.58± 0.04bVar_C in filter V on MJD  58420.100
16.59± 0.06bVar_C in filter B on MJD  58420.100
---- 16.26± 0.07bVar_C in filter I on MJD  58420.100
58433.02 16.55± 0.04bVar_C in filter V on MJD  58433.020
---- 16.31± 0.05bVar_C in filter R on MJD  58433.020
16.11± 0.08bVar_C in filter I on MJD  58433.020
58673.38 16.50± 0.03bVar_C in filter V on MJD  58673.380
16.60± 0.03bVar_C in filter B on MJD  58673.380
--------
58695.36 16.52± 0.05bVar_C in filter V on MJD  58695.360
16.54± 0.05bVar_C in filter B on MJD  58695.360
16.30± 0.04bVar_C in filter R on MJD  58695.360
----
58696.41 16.58± 0.05bVar_C in filter V on MJD  58696.410
16.59± 0.06bVar_C in filter B on MJD  58696.410
Var_C in filter B on MJD  58696.410
16.33± 0.07bVar_C in filter R on MJD  58696.410
Var_C in filter R on MJD  58696.410
----
58750.19 16.43± 0.03bVar_C in filter V on MJD  58750.190
---- 16.23± 0.05bVar_C in filter R on MJD  58750.190
----
58757.17 16.38± 0.05bVar_C in filter V on MJD  58757.170
---- 16.20± 0.05bVar_C in filter R on MJD  58757.170
----
58779.18 16.49± 0.04bVar_C in filter V on MJD  58779.180
16.63± 0.03bVar_C in filter B on MJD  58779.180
--------
58784.15 16.54± 0.05bVar_C in filter V on MJD  58784.150
-------- 16.17± 0.08bVar_C in filter I on MJD  58784.150
58812.21 16.23± 0.05AbVar_C in filter V on MJD  58812.210
Var_C in filter V on MJD  58812.210
---- 16.04± 0.06bVar_C in filter R on MJD  58812.210
15.86± 0.05bVar_C in filter I on MJD  58812.210
58902.06 16.32± 0.03AbVar_C in filter V on MJD  58902.060
Var_C in filter V on MJD  58902.060
---- 16.11± 0.04bVar_C in filter R on MJD  58902.060
15.92± 0.07bVar_C in filter I on MJD  58902.060
59056.38 16.47± 0.04bVar_C in filter V on MJD  59056.380
16.53± 0.06bVar_C in filter B on MJD  59056.380
16.20± 0.05bVar_C in filter R on MJD  59056.380
16.12± 0.07bVar_C in filter I on MJD  59056.380
59059.40 16.57± 0.06bVar_C in filter V on MJD  59059.400
---- 16.38± 0.05bVar_C in filter R on MJD  59059.400
16.24± 0.08bVar_C in filter I on MJD  59059.400
59081.30 16.46± 0.05bVar_C in filter V on MJD  59081.300
16.51± 0.04bVar_C in filter B on MJD  59081.300
16.28± 0.04bVar_C in filter R on MJD  59081.300
----
59082.32 16.42± 0.02bVar_C in filter V on MJD  59082.320
16.51± 0.03bVar_C in filter B on MJD  59082.320
Var_C in filter B on MJD  59082.320
16.23± 0.04bVar_C in filter R on MJD  59082.320
Var_C in filter R on MJD  59082.320
----
59084.29-------- 16.17± 0.05TbVar_C in filter R on MJD  59084.290
----
59161.09 16.21± 0.04AbVar_C in filter V on MJD  59161.090
Var_C in filter V on MJD  59161.090
16.31± 0.05AbVar_C in filter B on MJD  59161.090
Var_C in filter B on MJD  59161.090
16.02± 0.04AbVar_C in filter R on MJD  59161.090
Var_C in filter R on MJD  59161.090
----
59171.11 16.20± 0.03AbVar_C in filter V on MJD  59171.110
Var_C in filter V on MJD  59171.110
16.33± 0.03bVar_C in filter B on MJD  59171.110
---- 15.84± 0.07AbVar_C in filter I on MJD  59171.110
Var_C in filter I on MJD  59171.110
59227.12 16.40± 0.04AbVar_C in filter V on MJD  59227.120
Var_C in filter V on MJD  59227.120
Var_C in filter V on MJD  59227.120
16.44± 0.04AbVar_C in filter B on MJD  59227.120
Var_C in filter B on MJD  59227.120
Var_C in filter B on MJD  59227.120
16.18± 0.04AbVar_C in filter R on MJD  59227.120
Var_C in filter R on MJD  59227.120
15.99± 0.07bVar_C in filter I on MJD  59227.120
Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability


Plots of Brightness and Color

Key for Plot Variability Photometry Table Target Notes

Plot of photometry for Var_CPlot of color for Var_C

Key for Plot Variability Photometry Table Target Notes


Variability

Plot/Graph Photometry Table Target Notes

It is very likely that this star is variable.

Correlation factors between bands

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 [1.08 mag]B [1.20 mag]R [1.18 mag]
B [1.08 mag]0.98 (29)
R [1.18 mag]0.99 (26)0.98 (19)
I [0.86 mag]0.97 (15)0.91 (10)0.95 (11)

Magnitude-Magnitude Plots

The plots below are provided to check the values in the table above and also to show any non-linear correlations

Plot to assess correlation between bands for Var_C

Plot to assess correlation between bands for Var_C

Plot/Graph Photometry Table Target Notes

I & R Statistics

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)
92.50 | 0.96
R
(I|R)
76.40 | 1.3061.25 | 1.10
I
(I|R)
16.85 | 1.5118.10 | 1.1416.49 | 1.33

Back to catalog index


By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory

Generated on 2021-11-06 16:53:54 UT-5