UIT301 B416 (J013406.63+304147.8)

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Target Notes

Classification: OB-Supergiant

(Candidate LBV) Resolved from a trio of LGGS stars 4.5 arcseconds to the SW that combine to be 1 magnitude fainter in BV and 2 magnitudes fainter in RI.

Photometry Table

MJD	V	*	Image	B	*	Image	R	*	Images	I	*	Images
56140.37	16.05± 0.05	b		--	-	-	15.74± 0.06	b		--	-	-
56599.17	16.04± 0.04	Ab		16.13± 0.04	Ab		15.67± 0.05	b		--	-	-
56976.16	15.96± 0.04	b		16.09± 0.06	b		15.61± 0.05	b		--	-	-
57038.13	16.07± 0.04	b		16.15± 0.05	b		15.71± 0.04	b		--	-	-
57310.13	16.06± 0.05	b		16.21± 0.07	b		15.74± 0.04	b		--	-	-
57335.18	16.05± 0.06	b		--	-	-	15.65± 0.04	b		--	-	-
57401.10	16.03± 0.04	b		16.14± 0.05	b		--	-	-	--	-	-
57406.10	15.98± 0.04	b		16.06± 0.03	b		15.59± 0.05	b		15.51± 0.07	b
57634.34	16.18± 0.04	b		16.24± 0.07	b		15.79± 0.05	b		15.70± 0.06	b
57687.13	16.06± 0.04	b		16.30± 0.06	b		15.65± 0.04	b		15.59± 0.06	b
57964.35	16.10± 0.04	Ab		16.16± 0.06	Ab		15.72± 0.05	Ab		15.64± 0.06	Ab
57988.41	16.15± 0.04	b		16.32± 0.04	b		--	-	-	--	-	-
58043.10	16.10± 0.04	b		--	-	-	15.74± 0.04	b		15.63± 0.06	b
58045.16	16.13± 0.04	Ab		16.22± 0.07	Ab		15.74± 0.05	Ab		--	-	-
58073.19	16.01± 0.04	Ab		16.08± 0.06	Ab		--	-	-	--	-	-
58103.16	16.13± 0.04	Ab		16.26± 0.04	b		--	-	-	15.69± 0.06	b
58108.13	16.02± 0.05	Ab		16.10± 0.07	Ab		--	-	-	15.54± 0.07	Ab
58312.39	16.03± 0.05	b		16.12± 0.07	b		--	-	-	--	-	-
58316.38	16.04± 0.03	b		16.13± 0.05	b		15.69± 0.03	b		15.59± 0.04	b
58317.37	16.09± 0.04	b		16.18± 0.07	b		15.74± 0.04	b		--	-	-
58341.34	16.13± 0.06	b		--	-	-	--	-	-	15.66± 0.07	b
58342.38	16.15± 0.04	Ab		16.25± 0.06	Ab		15.76± 0.04	Ab		15.63± 0.05	b
58375.14	16.12± 0.04	b		--	-	-	15.75± 0.05	b		--	-	-
58420.08	15.99± 0.04	Ab		16.07± 0.06	Ab		15.68± 0.04	b		15.48± 0.06	Ab
58433.00	16.18± 0.04	b		--	-	-	15.82± 0.05	b		15.67± 0.06	b
58672.39	16.09± 0.07	b		--	-	-	15.70± 0.05	b		15.59± 0.07	b
58673.38	16.29± 0.02	b		16.42± 0.03	b		--	-	-	--	-	-
58695.36	16.08± 0.05	b		16.11± 0.05	b		15.74± 0.04	b		--	-	-
58696.39	16.07± 0.04	b		16.14± 0.06	b		15.73± 0.04	b		--	-	-
58779.15	15.93± 0.04	b		--	-	-	15.60± 0.05	b		15.45± 0.07	b
58784.12	16.05± 0.05	b		16.11± 0.05	b		--	-	-	--	-	-
58812.22	16.13± 0.05	b		--	-	-	--	-	-	15.69± 0.05	b
58902.06	16.08± 0.03	Ab		--	-	-	15.78± 0.04	b		15.61± 0.07	b
59056.38	16.09± 0.04	b		16.22± 0.06	b		15.74± 0.04	b		15.65± 0.07	b
59059.38	16.07± 0.05	b		16.12± 0.06	b		--	-	-	--	-	-
59081.30	16.10± 0.04	Ab		16.14± 0.06	b		15.76± 0.04	Ab		--	-	-
59082.34	16.06± 0.03	Ab		16.13± 0.05	Ab		15.71± 0.05	Ab		--	-	-
59084.31	--	-	-	--	-	-	15.70± 0.05	Tb		--	-	-
59161.09	16.19± 0.04	Ab		16.28± 0.05	Ab		15.82± 0.04	Ab		--	-	-
59171.09	16.17± 0.04	Ab		16.25± 0.05	Ab		15.73± 0.05	b		15.69± 0.07	Ab
59227.08	16.18± 0.03	Ab		16.26± 0.04	Ab		15.81± 0.05	Ab		--	-	-
59415.37	16.12± 0.04	Ab		16.27± 0.03	b		15.76± 0.04	b		--	-	-
59441.40	16.14± 0.05	Ab		16.23± 0.06	b		15.77± 0.05	b		15.64± 0.07	b
59442.39	16.19± 0.02	b		--	-	-	15.83± 0.05	b		15.71± 0.07	b
59463.28	16.03± 0.04	Ab		16.08± 0.06	b		--	-	-	15.65± 0.05	b
59523.16	16.11± 0.03	Ab		16.21± 0.02	b		15.75± 0.04	b		--	-	-
59525.15	16.11± 0.03	Ab		16.19± 0.05	b		15.71± 0.05	b		15.66± 0.09	b
59546.18	16.05± 0.03	Ab		16.09± 0.06	b		15.75± 0.04	b		15.64± 0.05	b
59551.12	16.05± 0.04	Ab		16.15± 0.04	Ab		--	-	-	15.54± 0.08	b
59583.16	16.13± 0.04	Ab		16.12± 0.06	b		15.78± 0.05	b		15.69± 0.08	b
59608.09	16.07± 0.04	Ab		--	-	-	15.69± 0.05	Ab		15.62± 0.05	b
59794.36	15.98± 0.04	Ab		16.09± 0.05	Ab		--	-	-	--	-	-
59823.24	16.08± 0.04	b		16.12± 0.04	b		--	-	-	--	-	-
59849.18	16.00± 0.04	Ab		--	-	-	15.66± 0.05	b		15.51± 0.08	b
59851.15	16.02± 0.04	Ab		--	-	-	15.68± 0.05	Ab		15.63± 0.08	b
59854.20	16.09± 0.04	A		16.09± 0.05	Ab		15.68± 0.05	b		--	-	-
59879.13	16.06± 0.04	Ab		16.23± 0.02	b		--	-	-	15.66± 0.05	Ab
59903.20	16.07± 0.03	Ab		16.16± 0.04	Ab		15.72± 0.05	Ab		15.62± 0.08	Ab
59904.12	16.13± 0.04	b		16.18± 0.05	b		15.76± 0.04	b		15.68± 0.06	b
59932.15	16.03± 0.04	Ab		16.02± 0.08	b		15.71± 0.05	b		15.63± 0.08	b
60172.38	16.05± 0.03	Ab		16.08± 0.05	b		15.70± 0.04	b		--	-	-
60205.16	16.03± 0.04	Ab		16.13± 0.03	b		15.69± 0.04	b		--	-	-
60227.11	15.95± 0.04	Ab		16.07± 0.06	b		15.56± 0.05	b		15.55± 0.07	Ab
60261.12	16.00± 0.03	b		--	-	-	15.66± 0.05	b		--	-	-
60262.14	16.00± 0.03	Ab		16.08± 0.04	Ab		15.73± 0.04	b		15.55± 0.09	b
60290.15	15.96± 0.04	Ab		16.02± 0.05	Ab		15.54± 0.05	b		15.55± 0.08	Ab
60292.18	15.99± 0.03	Ab		--	-	-	15.67± 0.05	Ab		15.55± 0.07	b
60342.09	16.04± 0.04	Ab		16.20± 0.03	b		15.69± 0.05	b		15.56± 0.07	b
60504.38	15.99± 0.04	b		16.04± 0.04	b		15.69± 0.05	b		--	-	-
60506.37	16.03± 0.03	Ab		16.17± 0.02	b		15.67± 0.04	b		15.54± 0.07	b
60529.37	15.99± 0.04	Ab		16.04± 0.06	b		--	-	-	15.59± 0.06	b
60533.38	16.04± 0.03	b		--	-	-	15.69± 0.05	b		15.58± 0.08	b
60556.27	16.03± 0.04	Ab		16.14± 0.04	Ab		15.66± 0.04	b		15.50± 0.07	b
60564.22	15.96± 0.04	b		16.06± 0.07	b		15.65± 0.05	b		--	-	-
60594.11	16.00± 0.04	Ab		--	-	-	15.68± 0.05	b		15.56± 0.07	Ab
60595.13	15.94± 0.04	b		16.02± 0.07	b		15.60± 0.05	b		--	-	-
60612.15	16.06± 0.04	Ab		16.14± 0.02	b		15.74± 0.06	b		--	-	-
60651.16	16.00± 0.04	Ab		16.09± 0.05	b		15.64± 0.05	b		15.53± 0.09	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 [0.35 mag]	B [0.40 mag]	R [0.29 mag]
B [0.40 mag]	0.71 (59)
R [0.29 mag]	0.77 (60)	0.39 (44)
I [0.26 mag]	0.71 (43)	0.25 (29)	0.60 (35)

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)	3.20 | 1.04
R (I|R)	2.08 | 1.37	1.81 | 0.14
I (I|R)	1.44 | 1.76	0.88 | 1.60	1.07 | 1.36