M33-013422.91 (J013422.91+304411.0)

---

Target Notes

Classification: OB-Supergiant

Unresolved from J013422.89+304410.9 of comparable brightness 0.3 arcseconds away.

Photometry Table

MJD	V	*	Image	B	*	Image	R	*	Images	I	*	Images
56140.37	16.96± 0.05	B		--	-	-	16.99± 0.10	B		--	-	-
56599.17	17.05± 0.05	B		17.11± 0.06	B		16.87± 0.05	B		--	-	-
56976.16	17.06± 0.04	B		17.14± 0.06	B		16.91± 0.05	B		--	-	-
57038.13	17.09± 0.04	B		17.15± 0.05	B		16.95± 0.04	B		--	-	-
57310.13	17.06± 0.05	B		17.10± 0.07	B		16.87± 0.05	B		--	-	-
57335.18	17.05± 0.06	B		--	-	-	16.85± 0.04	B		--	-	-
57401.10	17.03± 0.04	B		17.08± 0.05	B		--	-	-	--	-	-
57634.34	17.01± 0.04	B		17.08± 0.07	B		16.86± 0.05	B		16.75± 0.06	B
57687.13	17.03± 0.04	B		17.08± 0.06	B		16.91± 0.04	B		16.75± 0.06	B
57964.35	16.89± 0.04	AB		16.94± 0.06	AB		16.71± 0.05	AB		16.58± 0.06	AB
58045.16	16.97± 0.05	AB		17.05± 0.07	AB		16.80± 0.05	AB		--	-	-
58073.19	16.90± 0.04	AB		16.98± 0.06	AB		--	-	-	--	-	-
58103.16	16.92± 0.04	AB		17.00± 0.04	B		--	-	-	16.65± 0.06	B
58108.13	16.94± 0.05	AB		16.96± 0.07	AB		--	-	-	16.66± 0.08	AB
58312.39	16.95± 0.05	B		17.00± 0.07	B		--	-	-	--	-	-
58316.38	16.98± 0.03	B		17.08± 0.05	B		16.84± 0.03	B		16.69± 0.05	B
58317.37	16.96± 0.04	B		17.00± 0.07	B		16.80± 0.04	B		--	-	-
58341.34	17.02± 0.06	B		--	-	-	--	-	-	16.74± 0.07	B
58342.38	16.96± 0.04	AB		17.05± 0.06	AB		16.80± 0.04	AB		16.70± 0.06	B
58375.14	17.00± 0.04	B		--	-	-	16.85± 0.05	B		--	-	-
58420.08	16.94± 0.04	AB		16.97± 0.06	AB		16.84± 0.04	B		16.66± 0.07	AB
58433.00	17.06± 0.05	B		--	-	-	16.91± 0.05	B		16.79± 0.06	B
58672.39	17.04± 0.07	B		--	-	-	16.81± 0.05	B		16.58± 0.09	B
58695.36	17.08± 0.05	B		17.07± 0.05	B		16.88± 0.04	B		--	-	-
58696.39	17.02± 0.04	B		17.07± 0.06	B		16.85± 0.04	B		--	-	-
58779.15	17.02± 0.04	B		--	-	-	16.83± 0.05	B		16.61± 0.07	B
58784.12	17.16± 0.05	B		17.21± 0.05	B		--	-	-	--	-	-
58812.22	17.05± 0.05	B		--	-	-	--	-	-	16.78± 0.05	B
58902.06	17.06± 0.04	AB		--	-	-	16.91± 0.04	B		16.65± 0.07	B
59056.38	16.98± 0.04	B		17.08± 0.06	B		16.79± 0.04	B		16.66± 0.07	B
59059.38	17.00± 0.05	B		17.02± 0.06	B		--	-	-	--	-	-
59081.30	17.12± 0.04	AB		17.16± 0.06	B		16.97± 0.04	AB		--	-	-
59082.34	17.12± 0.03	AB		17.17± 0.05	AB		16.97± 0.05	AB		--	-	-
59084.34	--	-	-	--	-	-	16.97± 0.04	TB		--	-	-
59161.09	17.14± 0.04	AB		17.21± 0.05	AB		16.99± 0.04	AB		--	-	-
59171.09	17.11± 0.04	AB		17.22± 0.05	AB		16.85± 0.05	B		16.88± 0.08	AB
59227.08	17.03± 0.03	AB		17.09± 0.04	AB		16.87± 0.05	AB		--	-	-
59415.37	17.18± 0.04	AB		17.33± 0.04	B		16.99± 0.04	B		--	-	-
59441.40	16.98± 0.05	AB		17.00± 0.06	B		16.82± 0.05	B		16.64± 0.07	B
59442.39	17.09± 0.02	B		--	-	-	16.90± 0.05	B		16.78± 0.08	B
59463.28	17.11± 0.04	AB		17.14± 0.06	B		--	-	-	16.88± 0.05	B
59523.16	17.02± 0.03	AB		17.15± 0.02	B		16.84± 0.04	B		--	-	-
59525.14	16.96± 0.04	AB		17.04± 0.05	B		16.79± 0.05	B		--	-	-
59546.18	17.09± 0.04	AB		17.08± 0.06	B		16.97± 0.04	B		16.80± 0.05	B
59551.12	17.02± 0.04	AB		17.13± 0.04	AB		--	-	-	16.60± 0.08	B
59583.16	16.96± 0.04	AB		16.99± 0.06	B		16.83± 0.04	B		--	-	-
59608.09	17.08± 0.04	AB		--	-	-	16.97± 0.05	AB		16.86± 0.06	B
59794.36	17.04± 0.04	AB		17.14± 0.05	AB		--	-	-	--	-	-
59823.24	17.03± 0.04	B		17.07± 0.05	B		--	-	-	--	-	-
59849.19	16.88± 0.04	B		--	-	-	--	-	-	16.58± 0.08	B
59851.15	16.96± 0.04	AB		--	-	-	16.79± 0.05	AB		--	-	-
59854.19	16.99± 0.04	AB		17.05± 0.06	AB		16.78± 0.05	B		--	-	-
59879.12	17.00± 0.04	B		--	-	-	--	-	-	16.72± 0.06	AB
59903.18	16.99± 0.03	B		17.06± 0.06	B		16.84± 0.05	B		16.70± 0.08	B
59904.12	17.02± 0.04	B		17.13± 0.05	B		16.89± 0.04	B		16.79± 0.06	B
59932.15	17.07± 0.05	AB		17.08± 0.08	B		16.91± 0.05	B		--	-	-
60172.38	17.06± 0.03	AB		17.06± 0.05	B		16.91± 0.04	B		--	-	-
60205.15	17.01± 0.05	B		--	-	-	16.86± 0.05	B		--	-	-
60227.10	16.96± 0.04	AB		17.01± 0.07	B		16.78± 0.05	B		16.78± 0.06	B
60261.11	16.99± 0.04	B		--	-	-	--	-	-	16.69± 0.08	B
60262.13	17.00± 0.04	B		17.12± 0.04	B		16.89± 0.05	B		--	-	-
60290.14	16.98± 0.04	AB		17.05± 0.05	AB		16.81± 0.05	B		16.70± 0.06	B
60292.17	17.01± 0.04	AB		--	-	-	16.88± 0.05	B		16.66± 0.07	B
60342.09	16.95± 0.04	AB		--	-	-	16.79± 0.05	B		16.65± 0.07	B
60504.38	17.04± 0.04	B		17.10± 0.04	B		16.90± 0.05	B		--	-	-
60506.38	17.03± 0.04	B		--	-	-	16.85± 0.04	B		16.79± 0.07	B
60529.37	17.07± 0.04	AB		17.13± 0.06	B		--	-	-	16.78± 0.06	B
60556.25	16.98± 0.04	AB		17.03± 0.05	B		16.84± 0.04	B		16.70± 0.07	B
60564.22	16.93± 0.04	B		16.98± 0.07	B		16.79± 0.05	B		--	-	-
60595.13	17.06± 0.04	B		17.10± 0.07	B		16.90± 0.05	B		--	-	-
60594.10	17.07± 0.05	B		--	-	-	--	-	-	16.86± 0.07	B
60612.14	17.08± 0.05	B		--	-	-	16.98± 0.06	B		--	-	-
60651.15	17.07± 0.04	AB		17.14± 0.05	B		16.93± 0.05	B		--	-	-

Plots of Brightness and Color

Variability

It is 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 [0.30 mag]	B [0.39 mag]	R [0.28 mag]
B [0.39 mag]	0.80 (51)
R [0.28 mag]	0.65 (54)	0.56 (39)
I [0.30 mag]	0.52 (35)	0.48 (20)	0.37 (24)

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)	2.09 | 0.87
R (I|R)	1.72 | 1.09	2.47 | 0.22
I (I|R)	1.41 | 1.04	1.06 | 0.87	1.01 | 0.92