Color composite thumbnail image of Var A1Var A1 (J004450.54+413037.7)



Target Notes

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 EDR3 (2020) 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 17.04± 0.05TBVar_A1 in filter V on MJD  56142.320
------------
56267.15-------- 16.55± 0.03TBVar_A1 in filter R on MJD  56267.150
----
56490.37 16.78± 0.04BVar_A1 in filter V on MJD  56490.370
17.16± 0.05BVar_A1 in filter B on MJD  56490.370
--------
56536.24 16.82± 0.04BVar_A1 in filter V on MJD  56536.240
---- 16.38± 0.04BVar_A1 in filter R on MJD  56536.240
----
56915.13 16.77± 0.03BVar_A1 in filter V on MJD  56915.130
17.16± 0.04BVar_A1 in filter B on MJD  56915.130
16.31± 0.04BVar_A1 in filter R on MJD  56915.130
----
57227.31 16.87± 0.03BVar_A1 in filter V on MJD  57227.310
17.27± 0.04BVar_A1 in filter B on MJD  57227.310
16.46± 0.04BVar_A1 in filter R on MJD  57227.310
----
57310.08 17.03± 0.03BVar_A1 in filter V on MJD  57310.080
-------- 16.40± 0.06BVar_A1 in filter I on MJD  57310.080
57633.28 17.11± 0.04BVar_A1 in filter V on MJD  57633.280
17.43± 0.04BVar_A1 in filter B on MJD  57633.280
16.68± 0.04BVar_A1 in filter R on MJD  57633.280
----
57638.27 17.06± 0.05BVar_A1 in filter V on MJD  57638.270
-------- 16.48± 0.04BVar_A1 in filter I on MJD  57638.270
57928.37 16.81± 0.03BVar_A1 in filter V on MJD  57928.370
17.19± 0.04BVar_A1 in filter B on MJD  57928.370
16.40± 0.04BVar_A1 in filter R on MJD  57928.370
16.19± 0.06BVar_A1 in filter I on MJD  57928.370
57958.29 16.64± 0.04BVar_A1 in filter V on MJD  57958.290
16.99± 0.04BVar_A1 in filter B on MJD  57958.290
---- 15.90± 0.04BVar_A1 in filter I on MJD  57958.290
58043.06 16.48± 0.03BVar_A1 in filter V on MJD  58043.060
16.87± 0.04BVar_A1 in filter B on MJD  58043.060
---- 15.82± 0.05BVar_A1 in filter I on MJD  58043.060
58098.09 16.47± 0.04BVar_A1 in filter V on MJD  58098.090
16.89± 0.03BVar_A1 in filter B on MJD  58098.090
16.04± 0.04ABVar_A1 in filter R on MJD  58098.090
Var_A1 in filter R on MJD  58098.090
----
58312.29 16.70± 0.04BVar_A1 in filter V on MJD  58312.290
17.13± 0.04BVar_A1 in filter B on MJD  58312.290
16.32± 0.04BVar_A1 in filter R on MJD  58312.290
----
58316.26 16.70± 0.04BVar_A1 in filter V on MJD  58316.260
-------- 16.01± 0.04BVar_A1 in filter I on MJD  58316.260
58341.23 16.68± 0.05BVar_A1 in filter V on MJD  58341.230
17.09± 0.05BVar_A1 in filter B on MJD  58341.230
--------
58366.12 16.74± 0.03BVar_A1 in filter V on MJD  58366.120
17.10± 0.04BVar_A1 in filter B on MJD  58366.120
--------
58375.12 16.69± 0.04BVar_A1 in filter V on MJD  58375.120
---- 16.30± 0.03BVar_A1 in filter R on MJD  58375.120
----
58403.08 16.75± 0.04BVar_A1 in filter V on MJD  58403.080
-------- 16.08± 0.05BVar_A1 in filter I on MJD  58403.080
58433.09 16.75± 0.06BVar_A1 in filter V on MJD  58433.090
17.13± 0.06BVar_A1 in filter B on MJD  58433.090
16.32± 0.06BVar_A1 in filter R on MJD  58433.090
----
58671.33 16.59± 0.06ABVar_A1 in filter V on MJD  58671.330
Var_A1 in filter V on MJD  58671.330
16.97± 0.05ABVar_A1 in filter B on MJD  58671.330
Var_A1 in filter B on MJD  58671.330
--------
58673.29 16.61± 0.07BVar_A1 in filter V on MJD  58673.290
---- 16.18± 0.07BVar_A1 in filter R on MJD  58673.290
15.88± 0.08BVar_A1 in filter I on MJD  58673.290
58695.34 16.64± 0.05BVar_A1 in filter V on MJD  58695.340
---- 16.21± 0.04BVar_A1 in filter R on MJD  58695.340
15.95± 0.04BVar_A1 in filter I on MJD  58695.340
58696.30 16.67± 0.07BVar_A1 in filter V on MJD  58696.300
17.06± 0.07BVar_A1 in filter B on MJD  58696.300
16.24± 0.07BVar_A1 in filter R on MJD  58696.300
Var_A1 in filter R on MJD  58696.300
----
58750.10 16.72± 0.05ABVar_A1 in filter V on MJD  58750.100
Var_A1 in filter V on MJD  58750.100
17.13± 0.05ABVar_A1 in filter B on MJD  58750.100
Var_A1 in filter B on MJD  58750.100
--------
58779.07 16.69± 0.05ABVar_A1 in filter V on MJD  58779.070
Var_A1 in filter V on MJD  58779.070
---- 16.28± 0.03ABVar_A1 in filter R on MJD  58779.070
Var_A1 in filter R on MJD  58779.070
----
58812.08 16.67± 0.06ABVar_A1 in filter V on MJD  58812.080
Var_A1 in filter V on MJD  58812.080
---- 16.27± 0.07BVar_A1 in filter R on MJD  58812.080
15.96± 0.04BVar_A1 in filter I on MJD  58812.080
59000.39 16.94± 0.07BVar_A1 in filter V on MJD  59000.390
---- 16.58± 0.10BVar_A1 in filter R on MJD  59000.390
----
59055.31 17.03± 0.08BVar_A1 in filter V on MJD  59055.310
---- 16.62± 0.09BVar_A1 in filter R on MJD  59055.310
----
59077.20 17.07± 0.07BVar_A1 in filter V on MJD  59077.200
17.39± 0.07BVar_A1 in filter B on MJD  59077.200
16.64± 0.07BVar_A1 in filter R on MJD  59077.200
16.50± 0.10BVar_A1 in filter I on MJD  59077.200
59131.09 16.97± 0.07BVar_A1 in filter V on MJD  59131.090
---- 16.56± 0.07BVar_A1 in filter R on MJD  59131.090
----
59166.12 17.00± 0.07BVar_A1 in filter V on MJD  59166.120
-------- 16.39± 0.09BVar_A1 in filter I on MJD  59166.120
59194.11 16.99± 0.07BVar_A1 in filter V on MJD  59194.110
17.31± 0.07BVar_A1 in filter B on MJD  59194.110
--------
59376.35 16.83± 0.07BVar_A1 in filter V on MJD  59376.350
17.21± 0.07BVar_A1 in filter B on MJD  59376.350
--------
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

Plot of photometry for Var_A1Plot 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 [0.56 mag]B [0.64 mag]R [0.63 mag]
B [0.56 mag]0.98 (18)
R [0.63 mag]0.98 (18)0.99 (9)
I [0.67 mag]0.98 (12)0.98 (4)0.99 (5)

Magnitude-Magnitude Plots

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

Plot to assess correlation between bands for Var_A1

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)
13.84 | 0.87
R
(I|R)
13.11 | 1.0515.81 | 0.15
I
(I|R)
18.64 | 0.98--- | --- 8.02 | 0.96

Back to catalog index


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

Generated on 2021-11-06 16:53:54 UT-5