M33C-4119 (J013312.81+303012.6 )

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Target Notes

Classification: LBV

Mild overlap with five LGGS stars >3.5 magnitudes fainter within five arcseconds. Reclassified as an LBV on June 1, 2023 (see Martin et al. 2023).

Photometry Table

MJD	V	*	Image	B	*	Image	R	*	Images	I	*	Images
56140.40	17.84± 0.06	b		--	-	-	17.91± 0.13	b		--	-	-
56599.22	17.71± 0.07	b		17.74± 0.05	b		17.53± 0.06	b		--	-	-
57035.14	17.42± 0.04	b		17.57± 0.05	b		17.34± 0.05	b		--	-	-
57310.16	17.28± 0.05	b		17.39± 0.04	b		17.08± 0.05	b		--	-	-
57406.10	17.26± 0.05	b		17.61± 0.05	b		17.00± 0.05	b		16.91± 0.08	b
57634.41	17.31± 0.07	b		17.35± 0.08	b		17.14± 0.08	b		--	-	-
57638.40	17.33± 0.05	Ab		17.44± 0.04	b		17.17± 0.04	b		16.99± 0.09	Ab
57964.40	17.57± 0.04	b		--	-	-	--	-	-	17.36± 0.08	Ab
57988.43	17.31± 0.06	Tb		--	-	-	--	-	-	--	-	-
58043.15	17.16± 0.04	Ab		17.31± 0.05	Ab		16.87± 0.06	Ab		16.78± 0.09	b
58073.22	17.28± 0.05	b		17.52± 0.04	b		--	-	-	--	-	-
58108.13	17.44± 0.05	Ab		17.56± 0.04	Ab		--	-	-	17.15± 0.08	Ab
58316.35	17.18± 0.04	b		17.38± 0.04	b		--	-	-	--	-	-
58339.40	16.97± 0.05	b		17.11± 0.06	b		16.75± 0.06	b		--	-	-
58373.15	16.99± 0.06	b		17.25± 0.06	b		--	-	-	--	-	-
58375.16	16.88± 0.04	b		--	-	-	--	-	-	16.44± 0.09	b
58433.02	16.87± 0.05	b		--	-	-	16.59± 0.05	b		16.55± 0.10	b
58673.38	16.86± 0.03	b		17.14± 0.03	b		--	-	-	--	-	-
58695.39	17.00± 0.04	b		--	-	-	16.73± 0.04	b		--	-	-
58696.41	17.02± 0.05	b		17.16± 0.07	b		16.71± 0.07	b		--	-	-
58750.20	16.87± 0.04	Ab		17.10± 0.03	b		16.58± 0.05	b		16.47± 0.08	b
58757.17	16.86± 0.05	b		--	-	-	16.61± 0.05	b		--	-	-
58779.18	16.81± 0.04	b		17.02± 0.03	b		--	-	-	--	-	-
58784.14	16.86± 0.04	Ab		--	-	-	16.59± 0.04	b		16.36± 0.08	b
58812.20	16.87± 0.06	b		--	-	-	16.56± 0.06	b		--	-	-
59059.40	17.14± 0.06	b		--	-	-	16.88± 0.05	b		16.74± 0.08	b
59081.34	17.19± 0.05	Ab		17.32± 0.04	Ab		16.95± 0.05	Ab		16.77± 0.07	b
59082.38	17.22± 0.05	b		17.38± 0.03	b		16.98± 0.04	b		--	-	-
59084.25	--	-	-	--	-	-	16.98± 0.04	Tb		--	-	-
59161.14	17.36± 0.04	b		--	-	-	17.18± 0.04	b		16.98± 0.09	b
59171.15	17.34± 0.05	Ab		17.43± 0.06	Ab		17.12± 0.05	b		16.97± 0.08	Ab
59227.14	17.55± 0.05	Ab		17.64± 0.05	Ab		17.33± 0.05	Ab		17.24± 0.08	b
59415.39	17.81± 0.07	Tb		--	-	-	--	-	-	--	-	-
59441.42	17.78± 0.06	Tb		--	-	-	--	-	-	--	-	-
59442.41	17.80± 0.05	b		--	-	-	17.64± 0.05	b		--	-	-
59463.33	17.76± 0.06	Ab		17.82± 0.06	Ab		--	-	-	17.62± 0.08	b
59522.13	17.63± 0.05	b		--	-	-	17.50± 0.05	b		17.54± 0.09	b
59525.12	17.65± 0.05	b		--	-	-	17.54± 0.05	b		--	-	-
59546.20	17.59± 0.05	Ab		17.69± 0.03	b		--	-	-	17.26± 0.08	b
59551.14	17.61± 0.06	Ab		--	-	-	--	-	-	17.54± 0.09	b
59583.20	17.59± 0.04	b		--	-	-	17.48± 0.05	b		--	-	-
59608.14	17.61± 0.05	b		17.68± 0.08	b		17.35± 0.05	b		--	-	-
59794.38	17.64± 0.05	b		--	-	-	17.44± 0.04	b		--	-	-
59849.19	17.55± 0.05	Ab		17.71± 0.03	b		17.42± 0.05	b		--	-	-
59851.19	17.49± 0.05	b		17.63± 0.04	b		--	-	-	17.53± 0.10	b
59854.19	17.60± 0.04	b		--	-	-	17.37± 0.04	b		17.44± 0.09	b
59879.18	17.66± 0.04	b		17.75± 0.04	b		17.51± 0.07	b		--	-	-
59903.26	17.52± 0.04	b		17.57± 0.05	b		17.34± 0.05	b		17.26± 0.09	b
59904.15	17.55± 0.04	b		17.64± 0.03	b		17.37± 0.04	b		17.24± 0.08	b
59932.20	17.69± 0.06	Ab		17.80± 0.04	b		17.52± 0.07	b		--	-	-
60172.40	17.61± 0.06	b		17.67± 0.03	b		--	-	-	--	-	-
60205.19	17.66± 0.05	b		17.67± 0.05	b		--	-	-	--	-	-
60227.15	17.54± 0.05	b		--	-	-	17.37± 0.06	b		--	-	-
60261.16	17.52± 0.05	Ab		--	-	-	17.34± 0.05	b		17.34± 0.08	Ab
60262.18	17.48± 0.05	b		17.62± 0.03	b		17.32± 0.05	b		--	-	-
60290.22	17.57± 0.05	Ab		17.65± 0.04	Ab		17.45± 0.06	b		17.35± 0.09	b
60292.23	17.56± 0.06	Ab		--	-	-	17.40± 0.05	-		17.57± 0.10	b
60342.13	17.54± 0.06	b		--	-	-	17.38± 0.05	b		--	-	-
60506.34	17.64± 0.06	b		--	-	-	17.48± 0.05	b		--	-	-
60529.40	17.53± 0.05	b		17.59± 0.07	b		17.34± 0.05	b		--	-	-
60533.41	17.55± 0.06	b		17.66± 0.04	b		--	-	-	17.25± 0.09	b
60556.31	17.57± 0.05	b		--	-	-	--	-	-	17.26± 0.08	b
60562.27	17.56± 0.05	b		17.68± 0.03	b		--	-	-	17.31± 0.08	b
60592.13	17.64± 0.06	Ab		17.67± 0.05	Ab		17.53± 0.06	Ab		--	-	-
60612.17	17.51± 0.06	b		--	-	-	--	-	-	17.32± 0.07	b
60651.20	17.75± 0.06	Ab		17.84± 0.04	b		17.56± 0.05	b		--	-	-

Plots of Brightness and Color

Variability

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 [1.03 mag]	B [0.82 mag]	R [1.34 mag]
B [0.82 mag]	0.94 (38)
R [1.34 mag]	0.98 (44)	0.89 (25)
I [1.26 mag]	0.93 (29)	0.84 (16)	0.94 (18)

Magnitude-Magnitude Plots

The plots below are provided to check the values in the table above and also to show any non-linear correlations

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)	31.90 | 0.91
R (I|R)	36.40 | 0.89	25.73 | 0.65
I (I|R)	22.39 | 1.27	15.85 | 1.26	25.91 | 1.50