Color composite thumbnail image of M33C-4640M33C-4640 (J013303.09+303101.8 )



Target Notes

Color composite thumbnail image of M33C-4640

Classification: YSG

(Candidate LBV) Some overlap with stars about 2 magnitudes fainter 3--7 arcseconds away. Most easily resolved in R and I. B on 2457035.63981 flagged as “X” for bad PSF fit due to bad seeing. **Updated 180521**

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
56140.40 16.94± 0.05bM33C-4640 in filter V on MJD  56140.400
---- 16.84± 0.06bM33C-4640 in filter R on MJD  56140.400
----
56599.22 17.01± 0.06bM33C-4640 in filter V on MJD  56599.220
17.27± 0.05bM33C-4640 in filter B on MJD  56599.220
16.79± 0.05bM33C-4640 in filter R on MJD  56599.220
----
57035.14 16.82± 0.04bM33C-4640 in filter V on MJD  57035.140
17.46± 0.05XM33C-4640 in filter B on MJD  57035.140
16.69± 0.05bM33C-4640 in filter R on MJD  57035.140
----
57310.16 16.99± 0.05bM33C-4640 in filter V on MJD  57310.160
17.19± 0.05bM33C-4640 in filter B on MJD  57310.160
16.81± 0.05bM33C-4640 in filter R on MJD  57310.160
----
57328.16 17.03± 0.03bM33C-4640 in filter V on MJD  57328.160
17.09± 0.04bM33C-4640 in filter B on MJD  57328.160
16.83± 0.04bM33C-4640 in filter R on MJD  57328.160
----
57406.10 16.82± 0.04bM33C-4640 in filter V on MJD  57406.100
16.80± 0.04bM33C-4640 in filter B on MJD  57406.100
16.77± 0.05bM33C-4640 in filter R on MJD  57406.100
16.62± 0.07bM33C-4640 in filter I on MJD  57406.100
57634.39 16.93± 0.06AbM33C-4640 in filter V on MJD  57634.390
M33C-4640 in filter V on MJD  57634.390
17.23± 0.08AbM33C-4640 in filter B on MJD  57634.390
M33C-4640 in filter B on MJD  57634.390
16.73± 0.07AbM33C-4640 in filter R on MJD  57634.390
M33C-4640 in filter R on MJD  57634.390
----
57638.40 16.97± 0.05AbM33C-4640 in filter V on MJD  57638.400
M33C-4640 in filter V on MJD  57638.400
17.01± 0.04bM33C-4640 in filter B on MJD  57638.400
16.81± 0.03bM33C-4640 in filter R on MJD  57638.400
16.66± 0.08AbM33C-4640 in filter I on MJD  57638.400
M33C-4640 in filter I on MJD  57638.400
57964.40 16.94± 0.04bM33C-4640 in filter V on MJD  57964.400
-------- 16.56± 0.07AbM33C-4640 in filter I on MJD  57964.400
M33C-4640 in filter I on MJD  57964.400
57988.43 16.90± 0.06TbM33C-4640 in filter V on MJD  57988.430
------------
58043.13 17.16± 0.05bM33C-4640 in filter V on MJD  58043.130
17.09± 0.04bM33C-4640 in filter B on MJD  58043.130
16.88± 0.04bM33C-4640 in filter R on MJD  58043.130
----
58073.22 16.95± 0.05bM33C-4640 in filter V on MJD  58073.220
17.19± 0.05bM33C-4640 in filter B on MJD  58073.220
--------
58108.13 16.99± 0.04AbM33C-4640 in filter V on MJD  58108.130
M33C-4640 in filter V on MJD  58108.130
17.06± 0.05AbM33C-4640 in filter B on MJD  58108.130
M33C-4640 in filter B on MJD  58108.130
---- 16.54± 0.08AbM33C-4640 in filter I on MJD  58108.130
M33C-4640 in filter I on MJD  58108.130
58316.35 17.12± 0.07bM33C-4640 in filter V on MJD  58316.350
17.20± 0.04bM33C-4640 in filter B on MJD  58316.350
--------
58339.40 16.92± 0.05bM33C-4640 in filter V on MJD  58339.400
16.96± 0.06bM33C-4640 in filter B on MJD  58339.400
16.73± 0.06bM33C-4640 in filter R on MJD  58339.400
----
58341.37 16.97± 0.04bM33C-4640 in filter V on MJD  58341.370
-------- 16.64± 0.08bM33C-4640 in filter I on MJD  58341.370
58373.15 17.03± 0.06bM33C-4640 in filter V on MJD  58373.150
17.15± 0.06bM33C-4640 in filter B on MJD  58373.150
--------
58433.02 17.04± 0.05bM33C-4640 in filter V on MJD  58433.020
---- 16.87± 0.05bM33C-4640 in filter R on MJD  58433.020
16.53± 0.09bM33C-4640 in filter I on MJD  58433.020
58673.38 17.01± 0.03bM33C-4640 in filter V on MJD  58673.380
17.13± 0.03bM33C-4640 in filter B on MJD  58673.380
--------
58695.39 17.01± 0.05bM33C-4640 in filter V on MJD  58695.390
---- 16.84± 0.04bM33C-4640 in filter R on MJD  58695.390
----
58750.20 16.96± 0.04AbM33C-4640 in filter V on MJD  58750.200
M33C-4640 in filter V on MJD  58750.200
17.07± 0.03bM33C-4640 in filter B on MJD  58750.200
16.74± 0.05bM33C-4640 in filter R on MJD  58750.200
16.65± 0.08bM33C-4640 in filter I on MJD  58750.200
58779.18 16.84± 0.04bM33C-4640 in filter V on MJD  58779.180
17.09± 0.06bM33C-4640 in filter B on MJD  58779.180
--------
58784.14 17.00± 0.04bM33C-4640 in filter V on MJD  58784.140
---- 16.79± 0.04bM33C-4640 in filter R on MJD  58784.140
----
58812.20 17.02± 0.06bM33C-4640 in filter V on MJD  58812.200
---- 16.81± 0.07bM33C-4640 in filter R on MJD  58812.200
----
59059.40 17.02± 0.06bM33C-4640 in filter V on MJD  59059.400
---- 16.82± 0.05bM33C-4640 in filter R on MJD  59059.400
16.63± 0.08bM33C-4640 in filter I on MJD  59059.400
59081.34 16.98± 0.06AbM33C-4640 in filter V on MJD  59081.340
M33C-4640 in filter V on MJD  59081.340
17.04± 0.06AbM33C-4640 in filter B on MJD  59081.340
M33C-4640 in filter B on MJD  59081.340
16.77± 0.05AbM33C-4640 in filter R on MJD  59081.340
M33C-4640 in filter R on MJD  59081.340
16.55± 0.07bM33C-4640 in filter I on MJD  59081.340
59082.38 16.95± 0.05bM33C-4640 in filter V on MJD  59082.380
16.95± 0.03bM33C-4640 in filter B on MJD  59082.380
M33C-4640 in filter B on MJD  59082.380
M33C-4640 in filter B on MJD  59082.380
16.76± 0.04bM33C-4640 in filter R on MJD  59082.380
M33C-4640 in filter R on MJD  59082.380
M33C-4640 in filter R on MJD  59082.380
----
59084.25-------- 16.73± 0.04TbM33C-4640 in filter R on MJD  59084.250
----
59161.14 17.02± 0.05bM33C-4640 in filter V on MJD  59161.140
---- 16.89± 0.04bM33C-4640 in filter R on MJD  59161.140
16.74± 0.10bM33C-4640 in filter I on MJD  59161.140
59171.15 17.00± 0.05AbM33C-4640 in filter V on MJD  59171.150
M33C-4640 in filter V on MJD  59171.150
17.21± 0.11AbM33C-4640 in filter B on MJD  59171.150
M33C-4640 in filter B on MJD  59171.150
16.82± 0.05bM33C-4640 in filter R on MJD  59171.150
16.65± 0.08AbM33C-4640 in filter I on MJD  59171.150
M33C-4640 in filter I on MJD  59171.150
59227.14 17.04± 0.05AbM33C-4640 in filter V on MJD  59227.140
M33C-4640 in filter V on MJD  59227.140
17.08± 0.05AbM33C-4640 in filter B on MJD  59227.140
M33C-4640 in filter B on MJD  59227.140
16.86± 0.05AbM33C-4640 in filter R on MJD  59227.140
M33C-4640 in filter R on MJD  59227.140
16.70± 0.08bM33C-4640 in filter I on MJD  59227.140
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-4640Plot of color for M33C-4640

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 [0.47 mag]B [0.35 mag]R [0.20 mag]
B [0.47 mag]0.20 (19)
R [0.20 mag]0.62 (21)0.05 (13)
I [0.21 mag]0.02 (12)0.04 (7)0.14 (9)

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-4640

Plot to assess correlation between bands for M33C-4640

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)
2.36 | 1.57
R
(I|R)
1.46 | 1.30-1.01 | 0.42
I
(I|R)
0.12 | 1.290.28 | 3.220.29 | 1.43

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