M31/M33 Catalog: Photometry for Var A1


Open a color composite thumbnail image of Var A1Var A1 (J004450.54+413037.7)


Target Notes

Open a color composite thumbnail image of Var_A1

Classification: LBV

Not resolvable from LGGS star J004450.56+413038.3 less than 0.5 arcseconds N. May contribute up to -0.6 magnitudes or more to measured brightness.

Find In Simbad Query LGGS Massey (2016) at VizieR Query CAT WISE (Eisenhardt et al., 2020) at VizieR Query Gaia DR3 (2022) at VizieR LBT Spectra @UMN
Query Kaluzny et al. (1998) M31 Survey at VizieR
Query POINT-AGAPE An et al. (2004) M31 Survey at VizieR

Photometry Table

Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability
MJDV*ImageB*ImageR*ImagesI*Images
56142.32 17.03± 0.05TBOpen a thumbnail image of Var_A1 in filter V on MJD 56142.320
------------
56267.15-------- 16.54± 0.03TBOpen a thumnail image of Var_A1 in filter R on MJD 56267.150
----
56490.37 16.77± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 56490.370
 17.16± 0.05BOpen a thumnail image of Var_A1 in filter B on MJD 56490.370
--------
56536.24 16.81± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 56536.240
---- 16.36± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 56536.240
----
56915.13 16.76± 0.03BOpen a thumbnail image of Var_A1 in filter V on MJD 56915.130
 17.15± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 56915.130
 16.31± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 56915.130
----
57227.31 16.87± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 57227.310
 17.26± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 57227.310
 16.45± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 57227.310
----
57310.08 17.01± 0.03BOpen a thumbnail image of Var_A1 in filter V on MJD 57310.080
-------- 16.39± 0.06BOpen a thumnail image of Var_A1 in filter I on MJD 57310.080
57633.28 17.11± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 57633.280
 17.41± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 57633.280
 16.67± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 57633.280
----
57638.27 17.05± 0.05BOpen a thumbnail image of Var_A1 in filter V on MJD 57638.270
-------- 16.47± 0.04BOpen a thumnail image of Var_A1 in filter I on MJD 57638.270
57928.37 16.80± 0.03BOpen a thumbnail image of Var_A1 in filter V on MJD 57928.370
 17.18± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 57928.370
 16.40± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 57928.370
 16.18± 0.06BOpen a thumnail image of Var_A1 in filter I on MJD 57928.370
57958.29 16.61± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 57958.290
 16.98± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 57958.290
---- 15.91± 0.04BOpen a thumnail image of Var_A1 in filter I on MJD 57958.290
58043.06 16.48± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 58043.060
 16.88± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 58043.060
---- 15.83± 0.05BOpen a thumnail image of Var_A1 in filter I on MJD 58043.060
58098.09 16.47± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 58098.090
 16.87± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 58098.090
 16.03± 0.03ABOpen a thumnail image of Var_A1 in filter R on MJD 58098.090
Open a thumnail image of Var_A1 in filter R on MJD 58098.090
----
58312.29 16.70± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 58312.290
 17.11± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 58312.290
 16.31± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 58312.290
----
58316.26 16.69± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 58316.260
-------- 16.00± 0.04BOpen a thumnail image of Var_A1 in filter I on MJD 58316.260
58341.23 16.66± 0.05BOpen a thumbnail image of Var_A1 in filter V on MJD 58341.230
 17.08± 0.05BOpen a thumnail image of Var_A1 in filter B on MJD 58341.230
--------
58366.12 16.72± 0.03BOpen a thumbnail image of Var_A1 in filter V on MJD 58366.120
 17.10± 0.04BOpen a thumnail image of Var_A1 in filter B on MJD 58366.120
--------
58375.12 16.69± 0.03BOpen a thumbnail image of Var_A1 in filter V on MJD 58375.120
---- 16.29± 0.03BOpen a thumnail image of Var_A1 in filter R on MJD 58375.120
----
58403.08 16.74± 0.04BOpen a thumbnail image of Var_A1 in filter V on MJD 58403.080
-------- 16.07± 0.05BOpen a thumnail image of Var_A1 in filter I on MJD 58403.080
58433.09 16.75± 0.06BOpen a thumbnail image of Var_A1 in filter V on MJD 58433.090
 17.13± 0.06BOpen a thumnail image of Var_A1 in filter B on MJD 58433.090
 16.32± 0.06BOpen a thumnail image of Var_A1 in filter R on MJD 58433.090
----
58671.33 16.59± 0.06ABOpen a thumbnail image of Var_A1 in filter V on MJD 58671.330
Open a thumbnail image of Var_A1 in filter V on MJD 58671.330
 16.96± 0.05ABOpen a thumnail image of Var_A1 in filter B on MJD 58671.330
Open a thumnail image of Var_A1 in filter B on MJD 58671.330
--------
58673.29 16.60± 0.08BOpen a thumbnail image of Var_A1 in filter V on MJD 58673.290
---- 16.17± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 58673.290
 15.88± 0.08BOpen a thumnail image of Var_A1 in filter I on MJD 58673.290
58695.34 16.64± 0.05BOpen a thumbnail image of Var_A1 in filter V on MJD 58695.340
---- 16.22± 0.04BOpen a thumnail image of Var_A1 in filter R on MJD 58695.340
 15.95± 0.04BOpen a thumnail image of Var_A1 in filter I on MJD 58695.340
58696.30 16.66± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 58696.300
 17.05± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 58696.300
 16.23± 0.08BOpen a thumnail image of Var_A1 in filter R on MJD 58696.300
Open a thumnail image of Var_A1 in filter R on MJD 58696.300
----
58750.10 16.71± 0.05ABOpen a thumbnail image of Var_A1 in filter V on MJD 58750.100
Open a thumbnail image of Var_A1 in filter V on MJD 58750.100
 17.13± 0.05ABOpen a thumnail image of Var_A1 in filter B on MJD 58750.100
Open a thumnail image of Var_A1 in filter B on MJD 58750.100
--------
58779.07 16.69± 0.05ABOpen a thumbnail image of Var_A1 in filter V on MJD 58779.070
Open a thumbnail image of Var_A1 in filter V on MJD 58779.070
---- 16.28± 0.03ABOpen a thumnail image of Var_A1 in filter R on MJD 58779.070
Open a thumnail image of Var_A1 in filter R on MJD 58779.070
----
58812.08 16.66± 0.06ABOpen a thumbnail image of Var_A1 in filter V on MJD 58812.080
Open a thumbnail image of Var_A1 in filter V on MJD 58812.080
---- 16.26± 0.08BOpen a thumnail image of Var_A1 in filter R on MJD 58812.080
 15.96± 0.04BOpen a thumnail image of Var_A1 in filter I on MJD 58812.080
59000.39 16.93± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59000.390
---- 16.56± 0.10BOpen a thumnail image of Var_A1 in filter R on MJD 59000.390
----
59055.31 17.01± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59055.310
---- 16.60± 0.08BOpen a thumnail image of Var_A1 in filter R on MJD 59055.310
----
59077.20 17.06± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59077.200
 17.39± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59077.200
 16.64± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59077.200
 16.49± 0.10BOpen a thumnail image of Var_A1 in filter I on MJD 59077.200
59131.09 16.97± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59131.090
---- 16.55± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59131.090
----
59166.12 17.00± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59166.120
-------- 16.38± 0.09BOpen a thumnail image of Var_A1 in filter I on MJD 59166.120
59194.11 16.99± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59194.110
 17.31± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59194.110
--------
59376.35 16.81± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59376.350
 17.20± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59376.350
--------
59409.37 16.94± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59409.370
---- 16.52± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59409.370
----
59441.26 16.90± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59441.260
 17.23± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59441.260
---- 16.31± 0.09BOpen a thumnail image of Var_A1 in filter I on MJD 59441.260
59467.11 16.93± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59467.110
---- 16.49± 0.06BOpen a thumnail image of Var_A1 in filter R on MJD 59467.110
----
59522.04 16.93± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59522.040
 17.27± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59522.040
---- 16.41± 0.11BOpen a thumnail image of Var_A1 in filter I on MJD 59522.040
59546.05 16.97± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59546.050
---- 16.58± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59546.050
----
59583.10 16.98± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59583.100
 17.30± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59583.100
--------
59739.36 16.94± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59739.360
 17.33± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59739.360
 16.61± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59739.360
----
59816.14 17.02± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59816.140
-------- 16.29± 0.07BOpen a thumnail image of Var_A1 in filter I on MJD 59816.140
59851.09 16.96± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59851.090
 17.27± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 59851.090
 16.55± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59851.090
----
59879.03 16.97± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59879.030
-------- 16.41± 0.07BOpen a thumnail image of Var_A1 in filter I on MJD 59879.030
59905.07 16.95± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 59905.070
 17.25± 0.06BOpen a thumnail image of Var_A1 in filter B on MJD 59905.070
 16.58± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 59905.070
----
60147.26 16.97± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60147.260
 17.32± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 60147.260
--------
60172.17 16.87± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60172.170
 17.21± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 60172.170
 16.50± 0.06BOpen a thumnail image of Var_A1 in filter R on MJD 60172.170
 16.39± 0.07BOpen a thumnail image of Var_A1 in filter I on MJD 60172.170
60202.10 16.88± 0.06BOpen a thumbnail image of Var_A1 in filter V on MJD 60202.100
 17.20± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 60202.100
--------
60251.01 16.90± 0.08BOpen a thumbnail image of Var_A1 in filter V on MJD 60251.010
-------- 16.40± 0.07BOpen a thumnail image of Var_A1 in filter I on MJD 60251.010
60290.10 16.95± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60290.100
---- 16.55± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 60290.100
----
60469.35 16.84± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60469.350
 17.18± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 60469.350
--------
60504.31 16.71± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60504.310
---- 16.28± 0.06BOpen a thumnail image of Var_A1 in filter R on MJD 60504.310
----
60529.23 16.61± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60529.230
-------- 15.92± 0.06BOpen a thumnail image of Var_A1 in filter I on MJD 60529.230
60555.13 16.56± 0.06BOpen a thumbnail image of Var_A1 in filter V on MJD 60555.130
 16.96± 0.06BOpen a thumnail image of Var_A1 in filter B on MJD 60555.130
 16.13± 0.05BOpen a thumnail image of Var_A1 in filter R on MJD 60555.130
----
60587.10 16.52± 0.06BOpen a thumbnail image of Var_A1 in filter V on MJD 60587.100
-------- 15.79± 0.06BOpen a thumnail image of Var_A1 in filter I on MJD 60587.100
60649.08 16.42± 0.07BOpen a thumbnail image of Var_A1 in filter V on MJD 60649.080
 16.82± 0.07BOpen a thumnail image of Var_A1 in filter B on MJD 60649.080
 15.96± 0.07BOpen a thumnail image of Var_A1 in filter R on MJD 60649.080
----
60880.23 16.52± 0.09BOpen a thumbnail image of Var_A1 in filter V on MJD 60880.230
 16.91± 0.09BOpen a thumnail image of Var_A1 in filter B on MJD 60880.230
--------
61055.15 16.40± 0.06BOpen a thumbnail image of Var_A1 in filter V on MJD 61055.150
-------- 15.62± 0.09BOpen a thumnail image of Var_A1 in filter I on MJD 61055.150
Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability

Plots of Brightness and Color

Key for Plot Variability Photometry Table Target Notes

Open a plot of photometry for Var_A1Open a plot of color for Var_A1

Key for Plot Variability Photometry Table Target Notes

Variability

Plot/Graph Photometry Table Target Notes

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 [0.71 mag]B [0.60 mag]R [0.70 mag]
B [0.60 mag]0.98 (31)
R [0.70 mag]0.98 (29)0.97 (15)
I [0.87 mag]0.95 (21)0.95 (7)0.98 (6)

Magnitude-Magnitude Plots

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

Opens a plot to assess correlation between bands for Var_A1

Opens a plot to assess correlation between bands for Var_A1

Plot/Graph Photometry Table Target Notes

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)		10.44 | 0.84
R
(I|R)		11.18 | 0.9315.23 | 0.17
I
(I|R)		15.13 | 0.8812.25 | 0.849.08 | 0.81

Back to catalog index

By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory

Generated on 2026-10-12 15:55:15 UT-5