Color composite thumbnail image of M31-004424.21M31-004424.21 (J004424.21+412116.0)



Target Notes

Color composite thumbnail image of M31-004424.21

Classification: YSG

No blend concerns

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
56142.33 16.60± 0.06TM31-004424.21 in filter V on MJD  56142.330
------------
56267.14-------- 16.06± 0.05TM31-004424.21 in filter R on MJD  56267.140
----
56490.38 16.68± 0.04TM31-004424.21 in filter V on MJD  56490.380
------------
56536.26 16.69± 0.05-M31-004424.21 in filter V on MJD  56536.260
---- 16.13± 0.06-M31-004424.21 in filter R on MJD  56536.260
----
56537.20 16.67± 0.05-M31-004424.21 in filter V on MJD  56537.200
17.55± 0.07-M31-004424.21 in filter B on MJD  56537.200
--------
56915.14 16.69± 0.03AM31-004424.21 in filter V on MJD  56915.140
M31-004424.21 in filter V on MJD  56915.140
17.58± 0.05AM31-004424.21 in filter B on MJD  56915.140
M31-004424.21 in filter B on MJD  56915.140
16.12± 0.04AM31-004424.21 in filter R on MJD  56915.140
M31-004424.21 in filter R on MJD  56915.140
----
57227.33 16.71± 0.04AM31-004424.21 in filter V on MJD  57227.330
M31-004424.21 in filter V on MJD  57227.330
17.57± 0.04AM31-004424.21 in filter B on MJD  57227.330
M31-004424.21 in filter B on MJD  57227.330
16.13± 0.04AM31-004424.21 in filter R on MJD  57227.330
M31-004424.21 in filter R on MJD  57227.330
----
57310.09 16.61± 0.03AM31-004424.21 in filter V on MJD  57310.090
M31-004424.21 in filter V on MJD  57310.090
-------- 15.55± 0.06AM31-004424.21 in filter I on MJD  57310.090
M31-004424.21 in filter I on MJD  57310.090
57633.30 16.80± 0.05AM31-004424.21 in filter V on MJD  57633.300
M31-004424.21 in filter V on MJD  57633.300
17.73± 0.06AM31-004424.21 in filter B on MJD  57633.300
M31-004424.21 in filter B on MJD  57633.300
16.20± 0.04AM31-004424.21 in filter R on MJD  57633.300
M31-004424.21 in filter R on MJD  57633.300
----
57635.35 16.75± 0.05-M31-004424.21 in filter V on MJD  57635.350
-------- 15.64± 0.06-M31-004424.21 in filter I on MJD  57635.350
57638.27 16.85± 0.05-M31-004424.21 in filter V on MJD  57638.270
-------- 15.76± 0.04-M31-004424.21 in filter I on MJD  57638.270
57928.34 16.56± 0.04AM31-004424.21 in filter V on MJD  57928.340
M31-004424.21 in filter V on MJD  57928.340
17.44± 0.05AM31-004424.21 in filter B on MJD  57928.340
M31-004424.21 in filter B on MJD  57928.340
16.01± 0.05AM31-004424.21 in filter R on MJD  57928.340
M31-004424.21 in filter R on MJD  57928.340
15.49± 0.07AM31-004424.21 in filter I on MJD  57928.340
M31-004424.21 in filter I on MJD  57928.340
57958.26 16.51± 0.06-M31-004424.21 in filter V on MJD  57958.260
17.36± 0.07-M31-004424.21 in filter B on MJD  57958.260
---- 15.46± 0.06-M31-004424.21 in filter I on MJD  57958.260
57963.26 16.51± 0.06-M31-004424.21 in filter V on MJD  57963.260
17.38± 0.07-M31-004424.21 in filter B on MJD  57963.260
--------
57988.22 16.53± 0.07-M31-004424.21 in filter V on MJD  57988.220
17.37± 0.07-M31-004424.21 in filter B on MJD  57988.220
---- 15.43± 0.06-M31-004424.21 in filter I on MJD  57988.220
58035.03 16.62± 0.04-M31-004424.21 in filter V on MJD  58035.030
---- 16.08± 0.04-M31-004424.21 in filter R on MJD  58035.030
----
58043.05 16.60± 0.04-M31-004424.21 in filter V on MJD  58043.050
17.50± 0.06-M31-004424.21 in filter B on MJD  58043.050
16.03± 0.04-M31-004424.21 in filter R on MJD  58043.050
----
58045.05 16.60± 0.05-M31-004424.21 in filter V on MJD  58045.050
-------- 15.48± 0.06-M31-004424.21 in filter I on MJD  58045.050
58067.10 16.59± 0.05-M31-004424.21 in filter V on MJD  58067.100
-------- 15.49± 0.06-M31-004424.21 in filter I on MJD  58067.100
58073.09 16.59± 0.06-M31-004424.21 in filter V on MJD  58073.090
17.50± 0.07-M31-004424.21 in filter B on MJD  58073.090
--------
58077.08 16.58± 0.07-M31-004424.21 in filter V on MJD  58077.080
-------- 15.48± 0.07-M31-004424.21 in filter I on MJD  58077.080
58098.07 16.56± 0.06-M31-004424.21 in filter V on MJD  58098.070
17.44± 0.08-M31-004424.21 in filter B on MJD  58098.070
--------
58103.08 16.57± 0.05-M31-004424.21 in filter V on MJD  58103.080
-------- 15.47± 0.07-M31-004424.21 in filter I on MJD  58103.080
58312.26 16.58± 0.06-M31-004424.21 in filter V on MJD  58312.260
17.47± 0.07-M31-004424.21 in filter B on MJD  58312.260
15.99± 0.06-M31-004424.21 in filter R on MJD  58312.260
----
58316.24 16.59± 0.06-M31-004424.21 in filter V on MJD  58316.240
-------- 15.45± 0.06-M31-004424.21 in filter I on MJD  58316.240
58339.26 16.55± 0.06-M31-004424.21 in filter V on MJD  58339.260
-------- 15.47± 0.07-M31-004424.21 in filter I on MJD  58339.260
58342.26 16.57± 0.04-M31-004424.21 in filter V on MJD  58342.260
17.46± 0.06-M31-004424.21 in filter B on MJD  58342.260
--------
58366.11 16.56± 0.04-M31-004424.21 in filter V on MJD  58366.110
17.50± 0.06-M31-004424.21 in filter B on MJD  58366.110
--------
58375.09 16.57± 0.04-M31-004424.21 in filter V on MJD  58375.090
---- 15.97± 0.04-M31-004424.21 in filter R on MJD  58375.090
----
58403.06 16.59± 0.03-M31-004424.21 in filter V on MJD  58403.060
-------- 15.46± 0.05-M31-004424.21 in filter I on MJD  58403.060
58420.01 16.61± 0.06-M31-004424.21 in filter V on MJD  58420.010
17.47± 0.08-M31-004424.21 in filter B on MJD  58420.010
--------
58433.09 16.58± 0.06-M31-004424.21 in filter V on MJD  58433.090
17.52± 0.06-M31-004424.21 in filter B on MJD  58433.090
16.02± 0.06-M31-004424.21 in filter R on MJD  58433.090
----
58436.04 16.60± 0.04-M31-004424.21 in filter V on MJD  58436.040
17.51± 0.06-M31-004424.21 in filter B on MJD  58436.040
16.00± 0.04-M31-004424.21 in filter R on MJD  58436.040
----
58671.29 16.61± 0.07-M31-004424.21 in filter V on MJD  58671.290
17.61± 0.06-M31-004424.21 in filter B on MJD  58671.290
--------
58673.29 16.63± 0.07-M31-004424.21 in filter V on MJD  58673.290
---- 16.04± 0.07-M31-004424.21 in filter R on MJD  58673.290
15.49± 0.08-M31-004424.21 in filter I on MJD  58673.290
58696.30 16.64± 0.07-M31-004424.21 in filter V on MJD  58696.300
17.65± 0.07-M31-004424.21 in filter B on MJD  58696.300
16.02± 0.07-M31-004424.21 in filter R on MJD  58696.300
----
58750.07 16.63± 0.06-M31-004424.21 in filter V on MJD  58750.070
17.65± 0.07-M31-004424.21 in filter B on MJD  58750.070
--------
58779.05 16.61± 0.06-M31-004424.21 in filter V on MJD  58779.050
---- 16.02± 0.03-M31-004424.21 in filter R on MJD  58779.050
----
58812.07 16.58± 0.07-M31-004424.21 in filter V on MJD  58812.070
---- 15.99± 0.07-M31-004424.21 in filter R on MJD  58812.070
----
59000.39 16.54± 0.07-M31-004424.21 in filter V on MJD  59000.390
---- 15.98± 0.10-M31-004424.21 in filter R on MJD  59000.390
----
59055.31 16.59± 0.08-M31-004424.21 in filter V on MJD  59055.310
---- 16.02± 0.09-M31-004424.21 in filter R on MJD  59055.310
----
59077.20 16.61± 0.07-M31-004424.21 in filter V on MJD  59077.200
17.58± 0.07-M31-004424.21 in filter B on MJD  59077.200
16.02± 0.07-M31-004424.21 in filter R on MJD  59077.200
15.48± 0.10-M31-004424.21 in filter I on MJD  59077.200
59131.09 16.59± 0.07-M31-004424.21 in filter V on MJD  59131.090
---- 16.00± 0.07-M31-004424.21 in filter R on MJD  59131.090
----
59166.12 16.64± 0.07-M31-004424.21 in filter V on MJD  59166.120
-------- 15.50± 0.09-M31-004424.21 in filter I on MJD  59166.120
59194.11 16.61± 0.07-M31-004424.21 in filter V on MJD  59194.110
17.62± 0.07-M31-004424.21 in filter B on MJD  59194.110
--------
59376.35 16.55± 0.07-M31-004424.21 in filter V on MJD  59376.350
17.55± 0.07-M31-004424.21 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 M31-004424.21Plot of color for M31-004424.21

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 [0.37 mag]B [0.34 mag]R [0.23 mag]
B [0.37 mag]0.65 (23)
R [0.23 mag]0.89 (19)0.54 (10)
I [0.33 mag]0.88 (16)0.41 (4)0.40 (3)

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 M31-004424.21

Plot to assess correlation between bands for M31-004424.21

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)
1.58 | 1.12
R
(I|R)
1.72 | 1.001.87 | 0.04
I
(I|R)
2.79 | 0.91--- | --- --- | ----

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