M31-004406.32 (J004406.32+420131.3)

---

Target Notes

Classification: YSG

Unable to resolved from star J004406.24+420132.4 (4 magnitude fainter) about 1 arcsecond away. That contributes about -0.03 magnitudes in R and V and -0.06 magnitudes in B.

Photometry Table

MJD	V	*	Image	B	*	Image	R	*	Images	I	*	Images
56142.35	15.54± 0.03	Tb		--	-	-	--	-	-	--	-	-
56267.17	--	-	-	--	-	-	15.33± 0.04	Tb		--	-	-
56537.22	15.56± 0.03	b		16.02± 0.03	b		15.30± 0.04	b		--	-	-
56593.08	15.60± 0.03	b		--	-	-	15.31± 0.03	b		--	-	-
57282.18	15.65± 0.03	b		16.12± 0.04	b		15.37± 0.04	b		--	-	-
57314.14	15.66± 0.03	b		--	-	-	--	-	-	15.09± 0.05	b
57635.41	15.53± 0.07	b		15.98± 0.08	b		15.26± 0.07	b		14.97± 0.07	b
57958.32	15.62± 0.06	b		16.11± 0.06	b		--	-	-	15.08± 0.06	b
57963.28	15.65± 0.06	b		16.09± 0.05	b		15.37± 0.06	b		--	-	-
58045.07	15.62± 0.04	b		16.06± 0.04	b		15.31± 0.05	b		--	-	-
58067.12	15.64± 0.05	b		--	-	-	--	-	-	15.09± 0.07	b
58098.12	15.61± 0.06	b		16.09± 0.05	b		--	-	-	--	-	-
58312.32	15.63± 0.05	b		16.08± 0.04	b		15.35± 0.05	b		--	-	-
58316.28	15.68± 0.04	b		--	-	-	--	-	-	15.11± 0.06	b
58372.12	--	-	-	--	-	-	--	-	-	15.04± 0.06	Tb
58403.12	15.57± 0.04	b		--	-	-	15.28± 0.06	b		--	-	-
58671.30	15.70± 0.03	Tb		--	-	-	--	-	-	--	-	-
58672.32	15.61± 0.04	b		--	-	-	15.32± 0.05	b		15.01± 0.07	b
58695.31	15.62± 0.04	b		--	-	-	15.34± 0.04	b		15.05± 0.05	b
58750.10	15.63± 0.03	b		16.06± 0.02	b		--	-	-	--	-	-
58779.07	15.58± 0.03	b		--	-	-	15.29± 0.04	b		--	-	-
58836.18	15.61± 0.03	b		--	-	-	--	-	-	15.05± 0.04	b
59001.37	15.59± 0.04	b		--	-	-	15.30± 0.05	b		--	-	-
59019.33	15.64± 0.05	b		16.09± 0.04	b		--	-	-	--	-	-
59055.32	15.62± 0.04	Ab		16.06± 0.04	b		15.34± 0.03	b		15.05± 0.05	Ab
59077.22	15.61± 0.04	b		--	-	-	15.33± 0.04	b		--	-	-
59082.20	15.64± 0.03	b		16.10± 0.03	b		15.34± 0.02	b		--	-	-
59131.06	15.60± 0.03	Ab		16.02± 0.04	b		15.30± 0.03	b		--	-	-
59166.08	15.60± 0.03	Ab		--	-	-	--	-	-	15.03± 0.05	Ab
59194.08	15.62± 0.03	Ab		16.07± 0.02	b		15.34± 0.04	b		--	-	-
59376.36	15.61± 0.05	b		16.09± 0.05	b		--	-	-	--	-	-
59379.35	15.60± 0.04	b		--	-	-	15.30± 0.03	b		--	-	-
59409.39	15.64± 0.03	Ab		16.12± 0.06	b		15.34± 0.04	b		--	-	-
59442.28	15.61± 0.03	Ab		16.05± 0.04	b		15.32± 0.03	b		15.03± 0.05	Ab
59467.15	15.60± 0.03	Ab		16.02± 0.03	b		15.32± 0.04	b		--	-	-
59522.07	15.62± 0.03	b		16.05± 0.04	b		--	-	-	--	-	-
59546.08	15.58± 0.03	Ab		16.01± 0.03	b		--	-	-	15.04± 0.05	b
59583.08	15.61± 0.04	Ab		--	-	-	15.36± 0.05	b		15.06± 0.04	b
59753.33	15.61± 0.04	Ab		16.10± 0.04	b		15.35± 0.04	b		--	-	-
59816.18	15.59± 0.03	Ab		16.03± 0.03	b		15.30± 0.03	b		--	-	-
59848.07	15.60± 0.03	Ab		16.05± 0.04	b		--	-	-	15.05± 0.03	b
59851.07	15.63± 0.04	b		--	-	-	15.35± 0.05	b		15.07± 0.07	b
59854.14	15.61± 0.03	b		16.07± 0.03	b		15.33± 0.03	b		--	-	-
59879.07	15.60± 0.04	b		16.03± 0.04	b		--	-	-	--	-	-
59905.22	15.60± 0.03	b		16.04± 0.04	b		--	-	-	15.04± 0.05	b
60147.30	15.59± 0.04	Ab		16.02± 0.03	b		15.28± 0.04	b		--	-	-
60152.39	15.57± 0.04	b		16.03± 0.04	b		--	-	-	--	-	-
60172.29	15.59± 0.04	Ab		--	-	-	15.30± 0.06	Ab		15.03± 0.06	Ab
60202.14	15.63± 0.04	Ab		16.08± 0.04	Ab		15.38± 0.06	Ab		--	-	-
60251.05	15.56± 0.04	Ab		16.02± 0.03	b		--	-	-	15.00± 0.05	b
60290.08	15.56± 0.04	b		--	-	-	--	-	-	15.03± 0.06	b
60292.09	15.54± 0.05	b		--	-	-	--	-	-	14.99± 0.08	b
60533.24	15.57± 0.04	b		--	-	-	--	-	-	14.99± 0.06	b
60555.18	15.57± 0.04	b		16.02± 0.03	b		15.29± 0.04	b		--	-	-
60556.13	15.56± 0.04	b		15.98± 0.04	b		15.27± 0.04	b		--	-	-
60594.03	15.59± 0.05	b		--	-	-	--	-	-	15.03± 0.07	b
60595.05	15.66± 0.06	b		16.11± 0.05	b		15.39± 0.05	b		--	-	-
60651.06	15.61± 0.04	b		16.07± 0.04	b		15.31± 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 [0.18 mag]	B [0.15 mag]	R [0.13 mag]
B [0.15 mag]	0.78 (34)
R [0.13 mag]	0.82 (33)	0.77 (22)
I [0.14 mag]	0.86 (22)	0.72 (8)	0.88 (8)

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)	0.62 | 1.41
R (I|R)	0.42 | 0.90	-0.60 | 0.05
I (I|R)	0.43 | 1.37	0.27 | 1.52	0.26 | 1.26