Color composite thumbnail image of Var 15Var 15 (J004419.43+412247.0 )



Target Notes

Color composite thumbnail image of Var_15

Classification: LBV

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 17.98± 0.09TVar_15 in filter V on MJD  56142.330
------------
56267.14-------- 17.68± 0.06TVar_15 in filter R on MJD  56267.140
----
56490.38 18.28± 0.04TVar_15 in filter V on MJD  56490.380
------------
56536.26 18.24± 0.06-Var_15 in filter V on MJD  56536.260
---- 17.77± 0.06-Var_15 in filter R on MJD  56536.260
----
56537.20 18.21± 0.06-Var_15 in filter V on MJD  56537.200
18.58± 0.08-Var_15 in filter B on MJD  56537.200
--------
56915.14 17.75± 0.04AVar_15 in filter V on MJD  56915.140
Var_15 in filter V on MJD  56915.140
18.18± 0.06AVar_15 in filter B on MJD  56915.140
Var_15 in filter B on MJD  56915.140
17.15± 0.04AVar_15 in filter R on MJD  56915.140
Var_15 in filter R on MJD  56915.140
----
57227.33 17.64± 0.04AVar_15 in filter V on MJD  57227.330
Var_15 in filter V on MJD  57227.330
18.07± 0.05AVar_15 in filter B on MJD  57227.330
Var_15 in filter B on MJD  57227.330
17.05± 0.04AVar_15 in filter R on MJD  57227.330
Var_15 in filter R on MJD  57227.330
----
57310.09 17.59± 0.04AVar_15 in filter V on MJD  57310.090
Var_15 in filter V on MJD  57310.090
-------- 16.56± 0.06AVar_15 in filter I on MJD  57310.090
Var_15 in filter I on MJD  57310.090
57633.30 17.75± 0.05AVar_15 in filter V on MJD  57633.300
Var_15 in filter V on MJD  57633.300
18.19± 0.06AVar_15 in filter B on MJD  57633.300
Var_15 in filter B on MJD  57633.300
17.16± 0.04AVar_15 in filter R on MJD  57633.300
Var_15 in filter R on MJD  57633.300
----
57635.35 17.72± 0.06-Var_15 in filter V on MJD  57635.350
-------- 16.77± 0.06-Var_15 in filter I on MJD  57635.350
57638.27 17.79± 0.05-Var_15 in filter V on MJD  57638.270
-------- 16.94± 0.04-Var_15 in filter I on MJD  57638.270
57928.34 17.81± 0.05AVar_15 in filter V on MJD  57928.340
Var_15 in filter V on MJD  57928.340
18.22± 0.06AVar_15 in filter B on MJD  57928.340
Var_15 in filter B on MJD  57928.340
17.28± 0.05AVar_15 in filter R on MJD  57928.340
Var_15 in filter R on MJD  57928.340
16.92± 0.08AVar_15 in filter I on MJD  57928.340
Var_15 in filter I on MJD  57928.340
57958.26 17.93± 0.07-Var_15 in filter V on MJD  57958.260
18.38± 0.09-Var_15 in filter B on MJD  57958.260
---- 17.00± 0.07-Var_15 in filter I on MJD  57958.260
57963.26 17.85± 0.07-Var_15 in filter V on MJD  57963.260
18.26± 0.08-Var_15 in filter B on MJD  57963.260
--------
57988.22 17.76± 0.07-Var_15 in filter V on MJD  57988.220
18.22± 0.08-Var_15 in filter B on MJD  57988.220
---- 16.77± 0.06-Var_15 in filter I on MJD  57988.220
58035.03 17.62± 0.04-Var_15 in filter V on MJD  58035.030
---- 17.03± 0.04-Var_15 in filter R on MJD  58035.030
----
58043.05 17.63± 0.05-Var_15 in filter V on MJD  58043.050
18.13± 0.06-Var_15 in filter B on MJD  58043.050
17.04± 0.04-Var_15 in filter R on MJD  58043.050
----
58045.05 17.61± 0.05-Var_15 in filter V on MJD  58045.050
-------- 16.68± 0.07-Var_15 in filter I on MJD  58045.050
58067.10 17.51± 0.05-Var_15 in filter V on MJD  58067.100
-------- 16.56± 0.06-Var_15 in filter I on MJD  58067.100
58073.09 17.53± 0.06-Var_15 in filter V on MJD  58073.090
17.93± 0.07-Var_15 in filter B on MJD  58073.090
--------
58077.08 17.49± 0.08-Var_15 in filter V on MJD  58077.080
-------- 16.57± 0.08-Var_15 in filter I on MJD  58077.080
58098.07 17.48± 0.06-Var_15 in filter V on MJD  58098.070
17.94± 0.08-Var_15 in filter B on MJD  58098.070
--------
58103.08 17.50± 0.05-Var_15 in filter V on MJD  58103.080
-------- 16.63± 0.07-Var_15 in filter I on MJD  58103.080
58312.26 17.41± 0.06-Var_15 in filter V on MJD  58312.260
17.89± 0.07-Var_15 in filter B on MJD  58312.260
16.82± 0.06-Var_15 in filter R on MJD  58312.260
----
58316.24 17.40± 0.06-Var_15 in filter V on MJD  58316.240
-------- 16.55± 0.06-Var_15 in filter I on MJD  58316.240
58339.26 17.31± 0.06-Var_15 in filter V on MJD  58339.260
-------- 16.41± 0.07-Var_15 in filter I on MJD  58339.260
58342.26 17.39± 0.04-Var_15 in filter V on MJD  58342.260
17.86± 0.07-Var_15 in filter B on MJD  58342.260
--------
58366.11 17.31± 0.04-Var_15 in filter V on MJD  58366.110
17.75± 0.07-Var_15 in filter B on MJD  58366.110
--------
58375.09 17.34± 0.04-Var_15 in filter V on MJD  58375.090
---- 16.74± 0.04-Var_15 in filter R on MJD  58375.090
----
58403.06 17.30± 0.03-Var_15 in filter V on MJD  58403.060
-------- 16.33± 0.05-Var_15 in filter I on MJD  58403.060
58420.01 17.25± 0.06-Var_15 in filter V on MJD  58420.010
17.63± 0.08-Var_15 in filter B on MJD  58420.010
--------
58433.09 17.26± 0.06-Var_15 in filter V on MJD  58433.090
17.74± 0.06-Var_15 in filter B on MJD  58433.090
16.71± 0.06-Var_15 in filter R on MJD  58433.090
----
58436.04 17.27± 0.04-Var_15 in filter V on MJD  58436.040
17.73± 0.06-Var_15 in filter B on MJD  58436.040
16.71± 0.04-Var_15 in filter R on MJD  58436.040
----
58671.29 17.32± 0.07-Var_15 in filter V on MJD  58671.290
17.87± 0.07-Var_15 in filter B on MJD  58671.290
--------
58673.29 17.39± 0.07-Var_15 in filter V on MJD  58673.290
---- 16.80± 0.07-Var_15 in filter R on MJD  58673.290
16.43± 0.08-Var_15 in filter I on MJD  58673.290
58696.30 17.39± 0.07-Var_15 in filter V on MJD  58696.300
17.80± 0.07-Var_15 in filter B on MJD  58696.300
16.77± 0.07-Var_15 in filter R on MJD  58696.300
----
58750.07 17.32± 0.07-Var_15 in filter V on MJD  58750.070
17.75± 0.06-Var_15 in filter B on MJD  58750.070
--------
58779.05 17.30± 0.06-Var_15 in filter V on MJD  58779.050
---- 16.77± 0.04-Var_15 in filter R on MJD  58779.050
----
58812.07 17.17± 0.08-Var_15 in filter V on MJD  58812.070
---- 16.67± 0.07-Var_15 in filter R on MJD  58812.070
----
59000.39 17.31± 0.07-Var_15 in filter V on MJD  59000.390
---- 16.74± 0.11-Var_15 in filter R on MJD  59000.390
----
59055.31 17.29± 0.08-Var_15 in filter V on MJD  59055.310
---- 16.75± 0.09-Var_15 in filter R on MJD  59055.310
----
59077.20 17.24± 0.07-Var_15 in filter V on MJD  59077.200
17.77± 0.07-Var_15 in filter B on MJD  59077.200
16.70± 0.07-Var_15 in filter R on MJD  59077.200
16.34± 0.10-Var_15 in filter I on MJD  59077.200
59131.09 17.23± 0.07-Var_15 in filter V on MJD  59131.090
---- 16.68± 0.07-Var_15 in filter R on MJD  59131.090
----
59166.12 17.30± 0.07-Var_15 in filter V on MJD  59166.120
-------- 16.38± 0.09-Var_15 in filter I on MJD  59166.120
59194.11 17.26± 0.07-Var_15 in filter V on MJD  59194.110
17.73± 0.07-Var_15 in filter B on MJD  59194.110
--------
59376.35 17.08± 0.07-Var_15 in filter V on MJD  59376.350
17.61± 0.07-Var_15 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_15Plot of color for Var_15

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 [0.96 mag]B [1.21 mag]R [1.09 mag]
B [0.96 mag]0.98 (23)
R [1.09 mag]0.98 (19)0.97 (10)
I [0.67 mag]0.95 (16)0.95 (4)1.00 (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 Var_15

Plot to assess correlation between bands for Var_15

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)
16.91 | 0.75
R
(I|R)
24.25 | 1.029.55 | 0.14
I
(I|R)
12.07 | 1.17--- | --- --- | ----

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