Color composite thumbnail image of Var BVar B (J013349.23+303809.1)



Target Notes

Color composite thumbnail image of Var_B

Classification: LBV

Unresolved from J013349.22+303809.3 of comparable brightness 0.24 arcseconds away.

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
56140.38 17.20± 0.05ABVar_B in filter V on MJD  56140.380
Var_B in filter V on MJD  56140.380
---- 17.09± 0.11ABVar_B in filter R on MJD  56140.380
Var_B in filter R on MJD  56140.380
----
56593.16 17.05± 0.03BVar_B in filter V on MJD  56593.160
17.02± 0.02BVar_B in filter B on MJD  56593.160
--------
56599.18 17.09± 0.04ABVar_B in filter V on MJD  56599.180
Var_B in filter V on MJD  56599.180
17.02± 0.05ABVar_B in filter B on MJD  56599.180
Var_B in filter B on MJD  56599.180
17.00± 0.06ABVar_B in filter R on MJD  56599.180
Var_B in filter R on MJD  56599.180
----
56976.19 17.41± 0.04BVar_B in filter V on MJD  56976.190
17.25± 0.05BVar_B in filter B on MJD  56976.190
17.28± 0.07BVar_B in filter R on MJD  56976.190
----
57328.16 17.34± 0.04BVar_B in filter V on MJD  57328.160
17.24± 0.04BVar_B in filter B on MJD  57328.160
17.28± 0.04BVar_B in filter R on MJD  57328.160
----
57406.10 17.37± 0.05BVar_B in filter V on MJD  57406.100
17.37± 0.05BVar_B in filter B on MJD  57406.100
17.38± 0.06BVar_B in filter R on MJD  57406.100
17.36± 0.09BVar_B in filter I on MJD  57406.100
57634.36 17.51± 0.05ABVar_B in filter V on MJD  57634.360
Var_B in filter V on MJD  57634.360
17.37± 0.06ABVar_B in filter B on MJD  57634.360
Var_B in filter B on MJD  57634.360
17.46± 0.06ABVar_B in filter R on MJD  57634.360
Var_B in filter R on MJD  57634.360
17.62± 0.09ABVar_B in filter I on MJD  57634.360
Var_B in filter I on MJD  57634.360
57687.13 17.45± 0.05BVar_B in filter V on MJD  57687.130
17.32± 0.07BVar_B in filter B on MJD  57687.130
17.36± 0.05BVar_B in filter R on MJD  57687.130
17.54± 0.08BVar_B in filter I on MJD  57687.130
57964.35 17.55± 0.05ABVar_B in filter V on MJD  57964.350
Var_B in filter V on MJD  57964.350
17.41± 0.06ABVar_B in filter B on MJD  57964.350
Var_B in filter B on MJD  57964.350
17.46± 0.05ABVar_B in filter R on MJD  57964.350
Var_B in filter R on MJD  57964.350
17.56± 0.07ABVar_B in filter I on MJD  57964.350
Var_B in filter I on MJD  57964.350
58043.10 17.57± 0.05BVar_B in filter V on MJD  58043.100
---- 17.51± 0.05BVar_B in filter R on MJD  58043.100
17.68± 0.09BVar_B in filter I on MJD  58043.100
58045.18 17.49± 0.05BVar_B in filter V on MJD  58045.180
17.31± 0.07BVar_B in filter B on MJD  58045.180
17.45± 0.06BVar_B in filter R on MJD  58045.180
----
58073.20 17.49± 0.05BVar_B in filter V on MJD  58073.200
17.27± 0.07BVar_B in filter B on MJD  58073.200
--------
58103.17 17.46± 0.05ABVar_B in filter V on MJD  58103.170
Var_B in filter V on MJD  58103.170
17.45± 0.04BVar_B in filter B on MJD  58103.170
--------
58108.13 17.47± 0.05ABVar_B in filter V on MJD  58108.130
Var_B in filter V on MJD  58108.130
17.34± 0.07ABVar_B in filter B on MJD  58108.130
Var_B in filter B on MJD  58108.130
---- 17.51± 0.11ABVar_B in filter I on MJD  58108.130
Var_B in filter I on MJD  58108.130
58312.39 17.44± 0.05BVar_B in filter V on MJD  58312.390
17.38± 0.08BVar_B in filter B on MJD  58312.390
--------
58317.37 17.42± 0.05BVar_B in filter V on MJD  58317.370
17.30± 0.06BVar_B in filter B on MJD  58317.370
17.41± 0.04BVar_B in filter R on MJD  58317.370
----
58341.34 17.47± 0.07BVar_B in filter V on MJD  58341.340
-------- 17.59± 0.08BVar_B in filter I on MJD  58341.340
58342.40 17.43± 0.05BVar_B in filter V on MJD  58342.400
17.32± 0.07BVar_B in filter B on MJD  58342.400
17.40± 0.06BVar_B in filter R on MJD  58342.400
----
58373.15 17.58± 0.06BVar_B in filter V on MJD  58373.150
17.50± 0.07BVar_B in filter B on MJD  58373.150
--------
58375.14 17.56± 0.05BVar_B in filter V on MJD  58375.140
---- 17.50± 0.05BVar_B in filter R on MJD  58375.140
----
58420.10 17.49± 0.05BVar_B in filter V on MJD  58420.100
17.30± 0.06BVar_B in filter B on MJD  58420.100
---- 17.49± 0.08BVar_B in filter I on MJD  58420.100
58433.00 17.56± 0.06BVar_B in filter V on MJD  58433.000
---- 17.48± 0.06BVar_B in filter R on MJD  58433.000
17.71± 0.10BVar_B in filter I on MJD  58433.000
58672.39 17.31± 0.07BVar_B in filter V on MJD  58672.390
---- 17.25± 0.06BVar_B in filter R on MJD  58672.390
17.57± 0.15BVar_B in filter I on MJD  58672.390
58673.38 17.40± 0.03BVar_B in filter V on MJD  58673.380
17.36± 0.03BVar_B in filter B on MJD  58673.380
--------
58695.36 17.39± 0.05BVar_B in filter V on MJD  58695.360
17.27± 0.05BVar_B in filter B on MJD  58695.360
17.34± 0.04BVar_B in filter R on MJD  58695.360
----
58750.19 17.46± 0.04BVar_B in filter V on MJD  58750.190
---- 17.38± 0.05BVar_B in filter R on MJD  58750.190
----
58779.18 17.47± 0.04BVar_B in filter V on MJD  58779.180
17.23± 0.04BVar_B in filter B on MJD  58779.180
--------
58784.12 17.40± 0.06BVar_B in filter V on MJD  58784.120
17.26± 0.06BVar_B in filter B on MJD  58784.120
--------
58812.21 17.35± 0.05ABVar_B in filter V on MJD  58812.210
Var_B in filter V on MJD  58812.210
---- 17.23± 0.07BVar_B in filter R on MJD  58812.210
17.49± 0.07BVar_B in filter I on MJD  58812.210
58902.06 17.42± 0.04ABVar_B in filter V on MJD  58902.060
Var_B in filter V on MJD  58902.060
---- 17.36± 0.04BVar_B in filter R on MJD  58902.060
17.61± 0.10BVar_B in filter I on MJD  58902.060
59056.38 17.41± 0.04BVar_B in filter V on MJD  59056.380
17.30± 0.06BVar_B in filter B on MJD  59056.380
17.25± 0.05BVar_B in filter R on MJD  59056.380
17.37± 0.08BVar_B in filter I on MJD  59056.380
59059.38 17.38± 0.05BVar_B in filter V on MJD  59059.380
17.20± 0.06BVar_B in filter B on MJD  59059.380
--------
59081.26 17.46± 0.05BVar_B in filter V on MJD  59081.260
---- 17.39± 0.05BVar_B in filter R on MJD  59081.260
----
59082.32 17.47± 0.03BVar_B in filter V on MJD  59082.320
17.36± 0.03BVar_B in filter B on MJD  59082.320
17.39± 0.04BVar_B in filter R on MJD  59082.320
Var_B in filter R on MJD  59082.320
----
59084.29-------- 17.24± 0.06TBVar_B in filter R on MJD  59084.290
----
59161.09 17.38± 0.04ABVar_B in filter V on MJD  59161.090
Var_B in filter V on MJD  59161.090
17.31± 0.05ABVar_B in filter B on MJD  59161.090
Var_B in filter B on MJD  59161.090
17.26± 0.05ABVar_B in filter R on MJD  59161.090
Var_B in filter R on MJD  59161.090
----
59171.11 17.33± 0.04ABVar_B in filter V on MJD  59171.110
Var_B in filter V on MJD  59171.110
17.27± 0.03BVar_B in filter B on MJD  59171.110
---- 17.37± 0.08ABVar_B in filter I on MJD  59171.110
Var_B in filter I on MJD  59171.110
59227.09 17.35± 0.03ABVar_B in filter V on MJD  59227.090
Var_B in filter V on MJD  59227.090
17.26± 0.04ABVar_B in filter B on MJD  59227.090
Var_B in filter B on MJD  59227.090
17.29± 0.04BVar_B in filter R on MJD  59227.090
----
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_BPlot of color for Var_B

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 [0.49 mag]B [0.53 mag]R [0.51 mag]
B [0.49 mag]0.74 (27)
R [0.51 mag]0.91 (24)0.82 (15)
I [0.35 mag]0.44 (14)0.26 (8)0.40 (10)

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_B

Plot to assess correlation between bands for Var_B

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)
6.87 | 0.93
R
(I|R)
4.58 | 1.033.10 | 0.66
I
(I|R)
1.53 | 1.410.58 | 0.761.61 | 1.47

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