Color composite thumbnail image of M33C-21386M33C-21386 (J013406.80+304727.0)



Target Notes

Color composite thumbnail image of M33C-21386

Classification: Of/late-WN

(Candidate LBV) Unresolved from LGGS star J013406.75+304727.3 of comparable brightness in all bands within 1 arcsecond. One additional unresolved LGGS star 2 magnitudes fainter within 1 arcsecond. Also a blend of two LGGS stars and a third in addition that are 1 magnitude fainter respectively 2 and 5 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 16.73± 0.06BM33C-21386 in filter V on MJD  56140.370
---- 16.46± 0.08BM33C-21386 in filter R on MJD  56140.370
----
56599.17 16.57± 0.05BM33C-21386 in filter V on MJD  56599.170
---- 16.57± 0.06BM33C-21386 in filter R on MJD  56599.170
----
56976.16 16.47± 0.05BM33C-21386 in filter V on MJD  56976.160
16.43± 0.06BM33C-21386 in filter B on MJD  56976.160
16.27± 0.05BM33C-21386 in filter R on MJD  56976.160
----
57038.13 16.63± 0.05BM33C-21386 in filter V on MJD  57038.130
16.46± 0.05BM33C-21386 in filter B on MJD  57038.130
16.27± 0.06BM33C-21386 in filter R on MJD  57038.130
----
57310.13 16.72± 0.06BM33C-21386 in filter V on MJD  57310.130
16.57± 0.07BM33C-21386 in filter B on MJD  57310.130
16.36± 0.05BM33C-21386 in filter R on MJD  57310.130
----
57335.18 16.51± 0.06BM33C-21386 in filter V on MJD  57335.180
---- 16.30± 0.06BM33C-21386 in filter R on MJD  57335.180
----
57634.34 16.55± 0.05BM33C-21386 in filter V on MJD  57634.340
16.42± 0.07BM33C-21386 in filter B on MJD  57634.340
16.47± 0.05BM33C-21386 in filter R on MJD  57634.340
16.45± 0.06BM33C-21386 in filter I on MJD  57634.340
57638.35 16.71± 0.05BM33C-21386 in filter V on MJD  57638.350
16.57± 0.06BM33C-21386 in filter B on MJD  57638.350
16.42± 0.06BM33C-21386 in filter R on MJD  57638.350
16.64± 0.08BM33C-21386 in filter I on MJD  57638.350
57687.13 16.63± 0.05BM33C-21386 in filter V on MJD  57687.130
16.64± 0.06BM33C-21386 in filter B on MJD  57687.130
16.44± 0.05BM33C-21386 in filter R on MJD  57687.130
16.66± 0.07BM33C-21386 in filter I on MJD  57687.130
57964.37 16.67± 0.04BM33C-21386 in filter V on MJD  57964.370
16.59± 0.06BM33C-21386 in filter B on MJD  57964.370
16.39± 0.05BM33C-21386 in filter R on MJD  57964.370
16.52± 0.07BM33C-21386 in filter I on MJD  57964.370
57988.40 16.53± 0.05TBM33C-21386 in filter V on MJD  57988.400
------------
58045.15 16.62± 0.05BM33C-21386 in filter V on MJD  58045.150
16.60± 0.07BM33C-21386 in filter B on MJD  58045.150
16.30± 0.05BM33C-21386 in filter R on MJD  58045.150
----
58073.18 16.68± 0.03BM33C-21386 in filter V on MJD  58073.180
16.47± 0.06BM33C-21386 in filter B on MJD  58073.180
--------
58103.16 16.59± 0.05ABM33C-21386 in filter V on MJD  58103.160
M33C-21386 in filter V on MJD  58103.160
16.43± 0.04BM33C-21386 in filter B on MJD  58103.160
---- 16.57± 0.07BM33C-21386 in filter I on MJD  58103.160
58108.14 16.56± 0.05BM33C-21386 in filter V on MJD  58108.140
16.55± 0.06BM33C-21386 in filter B on MJD  58108.140
---- 16.52± 0.09BM33C-21386 in filter I on MJD  58108.140
58316.38 16.54± 0.03BM33C-21386 in filter V on MJD  58316.380
16.60± 0.05BM33C-21386 in filter B on MJD  58316.380
16.47± 0.04BM33C-21386 in filter R on MJD  58316.380
16.53± 0.05BM33C-21386 in filter I on MJD  58316.380
58317.39 16.59± 0.05BM33C-21386 in filter V on MJD  58317.390
---- 16.36± 0.08BM33C-21386 in filter R on MJD  58317.390
M33C-21386 in filter R on MJD  58317.390
----
58341.40 16.58± 0.06BM33C-21386 in filter V on MJD  58341.400
16.52± 0.09BM33C-21386 in filter B on MJD  58341.400
16.30± 0.08BM33C-21386 in filter R on MJD  58341.400
16.68± 0.10BM33C-21386 in filter I on MJD  58341.400
58342.36 16.60± 0.04BM33C-21386 in filter V on MJD  58342.360
16.55± 0.06BM33C-21386 in filter B on MJD  58342.360
M33C-21386 in filter B on MJD  58342.360
16.32± 0.05BM33C-21386 in filter R on MJD  58342.360
M33C-21386 in filter R on MJD  58342.360
16.59± 0.05BM33C-21386 in filter I on MJD  58342.360
M33C-21386 in filter I on MJD  58342.360
58403.15 16.58± 0.05BM33C-21386 in filter V on MJD  58403.150
-------- 16.23± 0.09BM33C-21386 in filter I on MJD  58403.150
58420.06 16.74± 0.04BM33C-21386 in filter V on MJD  58420.060
16.67± 0.06BM33C-21386 in filter B on MJD  58420.060
16.51± 0.04BM33C-21386 in filter R on MJD  58420.060
16.52± 0.07BM33C-21386 in filter I on MJD  58420.060
58433.00 16.49± 0.05BM33C-21386 in filter V on MJD  58433.000
---- 16.36± 0.06BM33C-21386 in filter R on MJD  58433.000
16.44± 0.07BM33C-21386 in filter I on MJD  58433.000
58696.39 16.61± 0.05BM33C-21386 in filter V on MJD  58696.390
16.51± 0.06BM33C-21386 in filter B on MJD  58696.390
16.32± 0.07BM33C-21386 in filter R on MJD  58696.390
----
58779.15 16.74± 0.06BM33C-21386 in filter V on MJD  58779.150
---- 16.50± 0.06BM33C-21386 in filter R on MJD  58779.150
> 18.37XM33C-21386 in filter I on MJD  58779.150
58812.22 16.74± 0.05BM33C-21386 in filter V on MJD  58812.220
-------- 16.50± 0.06BM33C-21386 in filter I on MJD  58812.220
58902.06 16.64± 0.04ABM33C-21386 in filter V on MJD  58902.060
M33C-21386 in filter V on MJD  58902.060
---- 16.40± 0.05BM33C-21386 in filter R on MJD  58902.060
16.46± 0.08BM33C-21386 in filter I on MJD  58902.060
59056.38 16.53± 0.05BM33C-21386 in filter V on MJD  59056.380
16.52± 0.06BM33C-21386 in filter B on MJD  59056.380
16.42± 0.06BM33C-21386 in filter R on MJD  59056.380
16.59± 0.08BM33C-21386 in filter I on MJD  59056.380
59081.33 16.50± 0.05BM33C-21386 in filter V on MJD  59081.330
16.59± 0.06BM33C-21386 in filter B on MJD  59081.330
16.50± 0.05BM33C-21386 in filter R on MJD  59081.330
----
59082.35 16.68± 0.05BM33C-21386 in filter V on MJD  59082.350
16.59± 0.07BM33C-21386 in filter B on MJD  59082.350
M33C-21386 in filter B on MJD  59082.350
16.51± 0.07BM33C-21386 in filter R on MJD  59082.350
M33C-21386 in filter R on MJD  59082.350
----
59084.29-------- 16.39± 0.06TBM33C-21386 in filter R on MJD  59084.290
----
59161.09 16.77± 0.05BM33C-21386 in filter V on MJD  59161.090
16.64± 0.05ABM33C-21386 in filter B on MJD  59161.090
M33C-21386 in filter B on MJD  59161.090
16.45± 0.05ABM33C-21386 in filter R on MJD  59161.090
M33C-21386 in filter R on MJD  59161.090
----
59171.08 16.66± 0.05ABM33C-21386 in filter V on MJD  59171.080
M33C-21386 in filter V on MJD  59171.080
16.46± 0.07BM33C-21386 in filter B on MJD  59171.080
16.38± 0.06BM33C-21386 in filter R on MJD  59171.080
16.48± 0.07ABM33C-21386 in filter I on MJD  59171.080
M33C-21386 in filter I on MJD  59171.080
59227.08 16.62± 0.05ABM33C-21386 in filter V on MJD  59227.080
M33C-21386 in filter V on MJD  59227.080
M33C-21386 in filter V on MJD  59227.080
16.51± 0.05ABM33C-21386 in filter B on MJD  59227.080
M33C-21386 in filter B on MJD  59227.080
M33C-21386 in filter B on MJD  59227.080
16.36± 0.07ABM33C-21386 in filter R on MJD  59227.080
M33C-21386 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 M33C-21386Plot of color for M33C-21386

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 [0.25 mag]B [0.29 mag]R [0.30 mag]
B [0.25 mag]0.21 (22)
R [0.30 mag]0.09 (26)0.28 (19)
I [0.45 mag]0.03 (16)0.10 (12)0.08 (12)

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 M33C-21386

Plot to assess correlation between bands for M33C-21386

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)
0.88 | 0.79
R
(I|R)
0.70 | 1.090.93 | 0.34
I
(I|R)
0.38 | 1.390.36 | 1.23-0.30 | 0.95

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