Color composite thumbnail image of Var 2Var 2 (J013418.37+303837.0)



Target Notes

Color composite thumbnail image of Var_2

Classification: LBV

Unresolved from J013418.36+303836.9 of comparable brightness 0.2 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
56140.37 18.19± 0.07BVar_2 in filter V on MJD  56140.370
---- 18.02± 0.18BVar_2 in filter R on MJD  56140.370
----
56599.17 18.17± 0.06BVar_2 in filter V on MJD  56599.170
18.05± 0.07BVar_2 in filter B on MJD  56599.170
17.93± 0.06BVar_2 in filter R on MJD  56599.170
----
56976.16 18.14± 0.05BVar_2 in filter V on MJD  56976.160
18.04± 0.06BVar_2 in filter B on MJD  56976.160
17.88± 0.05BVar_2 in filter R on MJD  56976.160
----
57038.13 18.08± 0.05BVar_2 in filter V on MJD  57038.130
17.98± 0.06BVar_2 in filter B on MJD  57038.130
17.85± 0.05BVar_2 in filter R on MJD  57038.130
----
57310.13 18.03± 0.07BVar_2 in filter V on MJD  57310.130
18.00± 0.07BVar_2 in filter B on MJD  57310.130
17.88± 0.06BVar_2 in filter R on MJD  57310.130
----
57335.18 18.10± 0.06BVar_2 in filter V on MJD  57335.180
---- 17.88± 0.05BVar_2 in filter R on MJD  57335.180
----
57401.10 18.12± 0.05BVar_2 in filter V on MJD  57401.100
18.00± 0.06BVar_2 in filter B on MJD  57401.100
--------
57634.34 18.14± 0.06BVar_2 in filter V on MJD  57634.340
18.07± 0.07BVar_2 in filter B on MJD  57634.340
17.93± 0.06BVar_2 in filter R on MJD  57634.340
17.95± 0.07BVar_2 in filter I on MJD  57634.340
57687.13 18.09± 0.06BVar_2 in filter V on MJD  57687.130
18.00± 0.07BVar_2 in filter B on MJD  57687.130
17.83± 0.06BVar_2 in filter R on MJD  57687.130
17.82± 0.09BVar_2 in filter I on MJD  57687.130
57964.35 18.13± 0.05ABVar_2 in filter V on MJD  57964.350
Var_2 in filter V on MJD  57964.350
18.02± 0.07ABVar_2 in filter B on MJD  57964.350
Var_2 in filter B on MJD  57964.350
17.88± 0.05ABVar_2 in filter R on MJD  57964.350
Var_2 in filter R on MJD  57964.350
17.82± 0.07ABVar_2 in filter I on MJD  57964.350
Var_2 in filter I on MJD  57964.350
58045.16 18.16± 0.06ABVar_2 in filter V on MJD  58045.160
Var_2 in filter V on MJD  58045.160
17.97± 0.07ABVar_2 in filter B on MJD  58045.160
Var_2 in filter B on MJD  58045.160
17.85± 0.06ABVar_2 in filter R on MJD  58045.160
Var_2 in filter R on MJD  58045.160
----
58073.19 18.13± 0.05ABVar_2 in filter V on MJD  58073.190
Var_2 in filter V on MJD  58073.190
18.04± 0.07ABVar_2 in filter B on MJD  58073.190
Var_2 in filter B on MJD  58073.190
--------
58103.16 18.04± 0.05ABVar_2 in filter V on MJD  58103.160
Var_2 in filter V on MJD  58103.160
-------- 17.65± 0.08BVar_2 in filter I on MJD  58103.160
58108.11 18.03± 0.06BVar_2 in filter V on MJD  58108.110
17.99± 0.08BVar_2 in filter B on MJD  58108.110
---- 17.56± 0.14BVar_2 in filter I on MJD  58108.110
58312.39 18.11± 0.06BVar_2 in filter V on MJD  58312.390
17.94± 0.10BVar_2 in filter B on MJD  58312.390
--------
58316.38 18.10± 0.04BVar_2 in filter V on MJD  58316.380
18.02± 0.06BVar_2 in filter B on MJD  58316.380
17.82± 0.04BVar_2 in filter R on MJD  58316.380
18.07± 0.07BVar_2 in filter I on MJD  58316.380
58317.37 18.11± 0.05BVar_2 in filter V on MJD  58317.370
18.01± 0.07BVar_2 in filter B on MJD  58317.370
Var_2 in filter B on MJD  58317.370
17.89± 0.05BVar_2 in filter R on MJD  58317.370
Var_2 in filter R on MJD  58317.370
----
58341.34 18.05± 0.07BVar_2 in filter V on MJD  58341.340
-------- 17.84± 0.08BVar_2 in filter I on MJD  58341.340
58342.38 18.14± 0.06ABVar_2 in filter V on MJD  58342.380
Var_2 in filter V on MJD  58342.380
18.04± 0.07ABVar_2 in filter B on MJD  58342.380
Var_2 in filter B on MJD  58342.380
17.87± 0.06ABVar_2 in filter R on MJD  58342.380
Var_2 in filter R on MJD  58342.380
17.84± 0.07BVar_2 in filter I on MJD  58342.380
Var_2 in filter I on MJD  58342.380
58375.14 18.05± 0.06BVar_2 in filter V on MJD  58375.140
---- 17.90± 0.05BVar_2 in filter R on MJD  58375.140
----
58420.08 18.06± 0.05ABVar_2 in filter V on MJD  58420.080
Var_2 in filter V on MJD  58420.080
17.95± 0.07ABVar_2 in filter B on MJD  58420.080
Var_2 in filter B on MJD  58420.080
17.85± 0.05BVar_2 in filter R on MJD  58420.080
18.12± 0.11ABVar_2 in filter I on MJD  58420.080
Var_2 in filter I on MJD  58420.080
58433.00 18.22± 0.08BVar_2 in filter V on MJD  58433.000
---- 17.88± 0.06BVar_2 in filter R on MJD  58433.000
18.17± 0.12BVar_2 in filter I on MJD  58433.000
58672.39 18.00± 0.09BVar_2 in filter V on MJD  58672.390
---- 17.93± 0.07BVar_2 in filter R on MJD  58672.390
> 18.05BVar_2 in filter I on MJD  58672.390
58695.36 18.09± 0.05BVar_2 in filter V on MJD  58695.360
18.04± 0.06BVar_2 in filter B on MJD  58695.360
17.95± 0.04BVar_2 in filter R on MJD  58695.360
----
58784.12 18.10± 0.06BVar_2 in filter V on MJD  58784.120
17.99± 0.06BVar_2 in filter B on MJD  58784.120
--------
58812.22 18.12± 0.05BVar_2 in filter V on MJD  58812.220
-------- 17.94± 0.07BVar_2 in filter I on MJD  58812.220
58902.07 18.13± 0.05BVar_2 in filter V on MJD  58902.070
---- 17.86± 0.05BVar_2 in filter R on MJD  58902.070
----
59059.38 18.10± 0.05BVar_2 in filter V on MJD  59059.380
18.06± 0.06BVar_2 in filter B on MJD  59059.380
--------
59081.30 18.09± 0.05ABVar_2 in filter V on MJD  59081.300
Var_2 in filter V on MJD  59081.300
18.00± 0.06BVar_2 in filter B on MJD  59081.300
17.91± 0.04ABVar_2 in filter R on MJD  59081.300
Var_2 in filter R on MJD  59081.300
----
59084.34-------- 17.88± 0.04TBVar_2 in filter R on MJD  59084.340
----
59161.07 18.12± 0.06BVar_2 in filter V on MJD  59161.070
18.11± 0.07BVar_2 in filter B on MJD  59161.070
17.93± 0.05BVar_2 in filter R on MJD  59161.070
----
59171.09 18.09± 0.05BVar_2 in filter V on MJD  59171.090
-------- 18.19± 0.09BVar_2 in filter I on MJD  59171.090
59227.08 18.14± 0.04BVar_2 in filter V on MJD  59227.080
18.11± 0.05BVar_2 in filter B on MJD  59227.080
17.91± 0.05BVar_2 in filter R on MJD  59227.080
----
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_2Plot of color for Var_2

Key for Plot Variability Photometry Table Target Notes


Variability

Plot/Graph Photometry Table Target Notes

From the data available in this survey, it is not possible to tell with certainty if 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 [0.17 mag]B [0.22 mag]R [0.20 mag]
B [0.17 mag]0.16 (22)
R [0.20 mag]0.03 (22)0.41 (16)
I [0.63 mag]0.28 (12)0.01 (7)0.00 (7)

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_2

Plot to assess correlation between bands for Var_2

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)
0.20 | 1.07
R
(I|R)
0.07 | 1.120.40 | 0.19
I
(I|R)
0.71 | 0.40-0.14 | 0.25-0.22 | 0.38

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