Color composite thumbnail image of Var 83Var 83 (J013410.93+303437.6)



Target Notes

Color composite thumbnail image of Var_83

Classification: LBV

Five LGGS stars >4 magnitudes fainter within 5 arcseconds.]

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 16.30± 0.06bVar_83 in filter V on MJD  56140.370
---- 16.10± 0.07bVar_83 in filter R on MJD  56140.370
----
56599.17 16.49± 0.05bVar_83 in filter V on MJD  56599.170
16.54± 0.07bVar_83 in filter B on MJD  56599.170
16.22± 0.06bVar_83 in filter R on MJD  56599.170
----
56976.16 16.30± 0.04bVar_83 in filter V on MJD  56976.160
16.35± 0.06bVar_83 in filter B on MJD  56976.160
16.05± 0.04bVar_83 in filter R on MJD  56976.160
----
56982.22 16.32± 0.06bVar_83 in filter V on MJD  56982.220
16.35± 0.06bVar_83 in filter B on MJD  56982.220
16.04± 0.07bVar_83 in filter R on MJD  56982.220
----
57038.13 16.33± 0.04bVar_83 in filter V on MJD  57038.130
16.37± 0.05bVar_83 in filter B on MJD  57038.130
16.06± 0.04bVar_83 in filter R on MJD  57038.130
----
57310.13 15.83± 0.05bVar_83 in filter V on MJD  57310.130
15.96± 0.07bVar_83 in filter B on MJD  57310.130
15.55± 0.05bVar_83 in filter R on MJD  57310.130
----
57328.19 15.88± 0.05bVar_83 in filter V on MJD  57328.190
15.97± 0.07bVar_83 in filter B on MJD  57328.190
15.62± 0.07bVar_83 in filter R on MJD  57328.190
----
57335.18 15.91± 0.06bVar_83 in filter V on MJD  57335.180
---- 15.67± 0.05bVar_83 in filter R on MJD  57335.180
----
57401.10 15.95± 0.04bVar_83 in filter V on MJD  57401.100
16.04± 0.05bVar_83 in filter B on MJD  57401.100
--------
57406.10 15.92± 0.04bVar_83 in filter V on MJD  57406.100
16.05± 0.03bVar_83 in filter B on MJD  57406.100
15.68± 0.04bVar_83 in filter R on MJD  57406.100
15.50± 0.07bVar_83 in filter I on MJD  57406.100
57634.37 15.90± 0.06AbVar_83 in filter V on MJD  57634.370
Var_83 in filter V on MJD  57634.370
15.96± 0.07AbVar_83 in filter B on MJD  57634.370
Var_83 in filter B on MJD  57634.370
15.66± 0.06AbVar_83 in filter R on MJD  57634.370
Var_83 in filter R on MJD  57634.370
15.57± 0.06bVar_83 in filter I on MJD  57634.370
57638.43 15.89± 0.06bVar_83 in filter V on MJD  57638.430
-------- 15.50± 0.09bVar_83 in filter I on MJD  57638.430
57687.13 15.77± 0.05bVar_83 in filter V on MJD  57687.130
15.87± 0.06bVar_83 in filter B on MJD  57687.130
15.54± 0.05bVar_83 in filter R on MJD  57687.130
15.37± 0.06bVar_83 in filter I on MJD  57687.130
57964.33 16.11± 0.04bVar_83 in filter V on MJD  57964.330
16.17± 0.07bVar_83 in filter B on MJD  57964.330
15.85± 0.05bVar_83 in filter R on MJD  57964.330
15.67± 0.06bVar_83 in filter I on MJD  57964.330
58045.16 16.09± 0.05AbVar_83 in filter V on MJD  58045.160
Var_83 in filter V on MJD  58045.160
16.16± 0.07AbVar_83 in filter B on MJD  58045.160
Var_83 in filter B on MJD  58045.160
15.84± 0.05AbVar_83 in filter R on MJD  58045.160
Var_83 in filter R on MJD  58045.160
----
58073.20 16.11± 0.04bVar_83 in filter V on MJD  58073.200
16.22± 0.06AbVar_83 in filter B on MJD  58073.200
Var_83 in filter B on MJD  58073.200
--------
58103.16 16.18± 0.04AbVar_83 in filter V on MJD  58103.160
Var_83 in filter V on MJD  58103.160
-------- 15.86± 0.06bVar_83 in filter I on MJD  58103.160
58108.11 16.11± 0.05bVar_83 in filter V on MJD  58108.110
16.17± 0.08bVar_83 in filter B on MJD  58108.110
---- 15.77± 0.07bVar_83 in filter I on MJD  58108.110
58312.39 16.12± 0.05bVar_83 in filter V on MJD  58312.390
16.18± 0.07bVar_83 in filter B on MJD  58312.390
--------
58317.37 16.13± 0.04bVar_83 in filter V on MJD  58317.370
16.20± 0.06bVar_83 in filter B on MJD  58317.370
15.91± 0.04bVar_83 in filter R on MJD  58317.370
----
58341.34 15.94± 0.07bVar_83 in filter V on MJD  58341.340
-------- 15.56± 0.07bVar_83 in filter I on MJD  58341.340
58342.40 16.02± 0.04bVar_83 in filter V on MJD  58342.400
16.09± 0.06bVar_83 in filter B on MJD  58342.400
15.80± 0.04bVar_83 in filter R on MJD  58342.400
----
58375.14 16.09± 0.04bVar_83 in filter V on MJD  58375.140
---- 15.84± 0.05bVar_83 in filter R on MJD  58375.140
----
58420.10 16.04± 0.04bVar_83 in filter V on MJD  58420.100
16.09± 0.06bVar_83 in filter B on MJD  58420.100
---- 15.64± 0.07bVar_83 in filter I on MJD  58420.100
58433.00 15.99± 0.04bVar_83 in filter V on MJD  58433.000
---- 15.76± 0.05bVar_83 in filter R on MJD  58433.000
15.61± 0.06bVar_83 in filter I on MJD  58433.000
58672.39 16.24± 0.07bVar_83 in filter V on MJD  58672.390
---- 15.98± 0.05bVar_83 in filter R on MJD  58672.390
15.93± 0.08bVar_83 in filter I on MJD  58672.390
58695.36 16.19± 0.05bVar_83 in filter V on MJD  58695.360
16.26± 0.05bVar_83 in filter B on MJD  58695.360
15.97± 0.04bVar_83 in filter R on MJD  58695.360
----
58784.12 16.22± 0.05bVar_83 in filter V on MJD  58784.120
16.30± 0.05bVar_83 in filter B on MJD  58784.120
--------
58812.22 16.18± 0.04bVar_83 in filter V on MJD  58812.220
-------- 15.80± 0.05bVar_83 in filter I on MJD  58812.220
58902.07 16.20± 0.04bVar_83 in filter V on MJD  58902.070
---- 15.97± 0.04bVar_83 in filter R on MJD  58902.070
----
59059.38 16.45± 0.05bVar_83 in filter V on MJD  59059.380
16.50± 0.05bVar_83 in filter B on MJD  59059.380
--------
59081.26 16.46± 0.05bVar_83 in filter V on MJD  59081.260
---- 16.23± 0.05bVar_83 in filter R on MJD  59081.260
----
59084.34-------- 16.24± 0.04TbVar_83 in filter R on MJD  59084.340
----
59161.07 16.67± 0.05bVar_83 in filter V on MJD  59161.070
16.72± 0.06bVar_83 in filter B on MJD  59161.070
16.39± 0.04bVar_83 in filter R on MJD  59161.070
----
59171.09 16.65± 0.04bVar_83 in filter V on MJD  59171.090
-------- 16.33± 0.06bVar_83 in filter I on MJD  59171.090
59227.08 16.79± 0.04bVar_83 in filter V on MJD  59227.080
16.80± 0.04bVar_83 in filter B on MJD  59227.080
16.50± 0.04bVar_83 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_83Plot of color for Var_83

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 [0.93 mag]B [1.02 mag]R [0.95 mag]
B [0.93 mag]0.99 (23)
R [0.95 mag]0.99 (23)0.99 (16)
I [0.96 mag]0.98 (13)0.79 (6)0.94 (6)

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_83

Plot to assess correlation between bands for Var_83

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)
26.19 | 0.74
R
(I|R)
31.63 | 1.0829.14 | 0.49
I
(I|R)
18.46 | 1.183.19 | 0.827.26 | 1.18

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