M31-004341.84 (J004341.84+411112.0)

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Target Notes

Classification: Of/late-WN

One LGGS star 2 magnitudes fainter 4 arcseconds to S does not interfere sigificantly with PSF fit. Seven other LGGS stars >3.5 magnitudes fainter within 5 arcseconds.

Photometry Table

MJD	V	*	Image	B	*	Image	R	*	Images	I	*	Images
56142.33	17.41± 0.06	Tb		--	-	-	--	-	-	--	-	-
56267.15	--	-	-	--	-	-	17.00± 0.05	Tb		--	-	-
56490.38	17.40± 0.04	Tb		--	-	-	--	-	-	--	-	-
56536.26	17.46± 0.05	b		--	-	-	17.00± 0.06	b		--	-	-
56537.18	17.49± 0.04	Ab		17.95± 0.06	Ab		17.13± 0.04	b		--	-	-
56915.16	17.51± 0.04	b		17.89± 0.06	b		17.02± 0.05	b		--	-	-
57227.34	17.50± 0.04	b		17.95± 0.05	b		16.99± 0.04	b		--	-	-
57310.10	17.46± 0.04	b		--	-	-	--	-	-	16.70± 0.07	b
57633.35	17.42± 0.05	Ab		17.87± 0.06	Ab		16.96± 0.05	Ab		--	-	-
57635.35	17.44± 0.05	b		--	-	-	--	-	-	16.66± 0.06	b
57638.25	17.43± 0.04	b		--	-	-	--	-	-	16.70± 0.07	b
57888.07	17.58± 0.10	X		17.99± 0.21	X		16.90± 0.08	X		--	-	-
57928.32	17.34± 0.04	b		17.80± 0.07	b		16.84± 0.06	b		16.49± 0.08	b
57958.26	17.56± 0.06	b		17.93± 0.08	b		--	-	-	16.73± 0.06	b
57963.26	17.42± 0.06	b		17.83± 0.07	b		--	-	-	--	-	-
57988.22	17.53± 0.07	b		18.00± 0.08	b		--	-	-	16.61± 0.06	b
58035.03	17.45± 0.04	b		--	-	-	16.99± 0.04	b		--	-	-
58043.05	17.52± 0.05	b		17.98± 0.06	b		17.03± 0.04	b		--	-	-
58045.05	17.52± 0.05	b		--	-	-	--	-	-	16.73± 0.07	b
58067.10	17.38± 0.05	b		--	-	-	--	-	-	16.63± 0.06	b
58073.09	17.49± 0.06	b		17.88± 0.07	b		--	-	-	--	-	-
58077.08	17.44± 0.07	b		--	-	-	--	-	-	16.73± 0.07	b
58098.07	17.36± 0.06	b		17.85± 0.07	b		--	-	-	--	-	-
58103.08	17.43± 0.05	b		--	-	-	--	-	-	16.61± 0.07	b
58312.26	17.55± 0.06	b		18.04± 0.08	b		17.05± 0.06	b		--	-	-
58316.24	17.49± 0.06	b		--	-	-	--	-	-	16.62± 0.06	b
58339.26	17.51± 0.07	b		--	-	-	--	-	-	16.68± 0.07	b
58342.26	17.49± 0.04	b		17.90± 0.07	b		--	-	-	--	-	-
58366.11	17.45± 0.04	b		17.85± 0.07	b		--	-	-	--	-	-
58375.09	17.45± 0.05	b		--	-	-	17.01± 0.04	b		--	-	-
58403.06	17.34± 0.04	b		--	-	-	--	-	-	16.56± 0.05	b
58420.01	17.33± 0.06	b		17.74± 0.08	b		--	-	-	--	-	-
58436.04	17.36± 0.04	b		17.73± 0.06	b		16.83± 0.04	b		--	-	-
58671.35	17.39± 0.03	Ab		17.83± 0.04	b		16.96± 0.04	b		--	-	-
58695.41	17.53± 0.03	b		--	-	-	17.01± 0.04	b		--	-	-
58750.11	17.35± 0.04	b		--	-	-	--	-	-	16.54± 0.05	b
58779.03	17.36± 0.03	b		17.80± 0.03	b		--	-	-	--	-	-
58812.16	17.40± 0.03	b		--	-	-	16.91± 0.04	b		--	-	-
59000.37	17.44± 0.06	b		--	-	-	17.00± 0.05	b		--	-	-
59055.29	17.42± 0.06	b		17.90± 0.07	b		--	-	-	--	-	-
59077.25	17.45± 0.07	b		--	-	-	16.97± 0.05	b		16.65± 0.06	b
59131.11	17.43± 0.05	b		17.95± 0.05	b		--	-	-	--	-	-
59166.14	17.40± 0.05	b		--	-	-	--	-	-	16.66± 0.06	b
59194.12	17.46± 0.04	b		--	-	-	16.96± 0.05	b		--	-	-
59376.38	17.46± 0.07	b		17.94± 0.07	b		--	-	-	--	-	-
59409.33	17.68± 0.11	AX		--	-	-	17.02± 0.06	b		--	-	-
59442.36	17.40± 0.06	b		17.82± 0.07	b		--	-	-	16.60± 0.06	b
59467.13	17.46± 0.07	b		--	-	-	17.05± 0.04	b		--	-	-
59522.10	17.42± 0.04	b		17.85± 0.06	b		--	-	-	--	-	-
59546.13	17.47± 0.04	b		--	-	-	--	-	-	16.70± 0.06	b
59583.12	17.32± 0.05	b		--	-	-	16.92± 0.04	b		--	-	-
59739.38	17.41± 0.06	b		17.86± 0.07	b		16.90± 0.05	b		--	-	-
59816.16	17.46± 0.06	b		--	-	-	16.98± 0.04	b		--	-	-
59848.09	17.36± 0.04	b		--	-	-	--	-	-	16.50± 0.06	b
59879.05	17.38± 0.05	b		17.88± 0.07	b		--	-	-	--	-	-
59905.10	17.46± 0.04	b		--	-	-	17.01± 0.03	b		16.71± 0.04	b
60147.27	17.36± 0.07	b		--	-	-	16.88± 0.07	b		--	-	-
60172.21	17.36± 0.07	b		--	-	-	--	-	-	16.62± 0.10	b
60201.09	17.34± 0.08	b		--	-	-	16.93± 0.07	b		--	-	-
60251.03	17.33± 0.07	b		17.73± 0.07	b		--	-	-	--	-	-
60290.06	17.43± 0.07	b		--	-	-	--	-	-	16.66± 0.09	b
60469.38	17.35± 0.08	b		--	-	-	16.89± 0.08	b		--	-	-
60504.34	17.39± 0.07	b		17.87± 0.08	b		--	-	-	--	-	-
60533.25	17.32± 0.07	Tb		--	-	-	--	-	-	--	-	-
60555.16	17.26± 0.06	b		--	-	-	16.84± 0.07	b		16.53± 0.09	b
60594.07	17.33± 0.07	b		17.80± 0.08	b		16.86± 0.07	b		--	-	-
60651.11	17.32± 0.07	b		--	-	-	--	-	-	16.63± 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 [0.31 mag]	B [0.31 mag]	R [0.30 mag]
B [0.31 mag]	0.73 (28)
R [0.30 mag]	0.73 (27)	0.74 (11)
I [0.24 mag]	0.51 (24)	0.38 (4)	0.97 (4)

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)	1.35 | 0.83
R (I|R)	1.75 | 0.97	0.57 | 0.06
I (I|R)	1.22 | 1.33	--- | ---	--- | ----