Color composite thumbnail image of M31-004247.30M31-004247.30 (J004247.30+414451.0)



Target Notes

Color composite thumbnail image of M31-004247.30

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
56142.31 16.54± 0.04TM31-004247.30 in filter V on MJD  56142.310
------------
56267.16-------- 16.00± 0.03TM31-004247.30 in filter R on MJD  56267.160
----
56490.35 16.38± 0.05-M31-004247.30 in filter V on MJD  56490.350
17.06± 0.05-M31-004247.30 in filter B on MJD  56490.350
--------
56536.22 16.27± 0.09-M31-004247.30 in filter V on MJD  56536.220
---- 15.95± 0.04-M31-004247.30 in filter R on MJD  56536.220
----
56923.11 16.35± 0.04-M31-004247.30 in filter V on MJD  56923.110
16.97± 0.04-M31-004247.30 in filter B on MJD  56923.110
15.97± 0.04-M31-004247.30 in filter R on MJD  56923.110
----
57227.36 16.27± 0.04-M31-004247.30 in filter V on MJD  57227.360
16.89± 0.04-M31-004247.30 in filter B on MJD  57227.360
--------
57314.12 16.38± 0.04-M31-004247.30 in filter V on MJD  57314.120
-------- 15.62± 0.04-M31-004247.30 in filter I on MJD  57314.120
57633.25 16.37± 0.04-M31-004247.30 in filter V on MJD  57633.250
17.06± 0.04-M31-004247.30 in filter B on MJD  57633.250
15.99± 0.03-M31-004247.30 in filter R on MJD  57633.250
----
57635.36 16.38± 0.04-M31-004247.30 in filter V on MJD  57635.360
-------- 15.61± 0.04-M31-004247.30 in filter I on MJD  57635.360
57958.35 16.37± 0.05-M31-004247.30 in filter V on MJD  57958.350
---- 15.99± 0.04-M31-004247.30 in filter R on MJD  57958.350
15.62± 0.04-M31-004247.30 in filter I on MJD  57958.350
57963.38 16.38± 0.04-M31-004247.30 in filter V on MJD  57963.380
17.00± 0.04-M31-004247.30 in filter B on MJD  57963.380
--------
57988.34 16.38± 0.03-M31-004247.30 in filter V on MJD  57988.340
17.01± 0.03-M31-004247.30 in filter B on MJD  57988.340
16.02± 0.03-M31-004247.30 in filter R on MJD  57988.340
15.63± 0.03-M31-004247.30 in filter I on MJD  57988.340
59059.34 16.39± 0.03-M31-004247.30 in filter V on MJD  59059.340
---- 16.00± 0.03-M31-004247.30 in filter R on MJD  59059.340
----
58067.17 16.31± 0.03-M31-004247.30 in filter V on MJD  58067.170
-------- 15.56± 0.04-M31-004247.30 in filter I on MJD  58067.170
58077.11 16.35± 0.05-M31-004247.30 in filter V on MJD  58077.110
17.00± 0.04-M31-004247.30 in filter B on MJD  58077.110
15.99± 0.05-M31-004247.30 in filter R on MJD  58077.110
15.63± 0.05-M31-004247.30 in filter I on MJD  58077.110
58312.35 16.23± 0.04-M31-004247.30 in filter V on MJD  58312.350
16.86± 0.04-M31-004247.30 in filter B on MJD  58312.350
--------
58339.35 16.31± 0.04-M31-004247.30 in filter V on MJD  58339.350
16.93± 0.03-M31-004247.30 in filter B on MJD  58339.350
15.93± 0.03-M31-004247.30 in filter R on MJD  58339.350
----
58341.28 16.29± 0.04-M31-004247.30 in filter V on MJD  58341.280
---- 15.93± 0.04-M31-004247.30 in filter R on MJD  58341.280
15.55± 0.04-M31-004247.30 in filter I on MJD  58341.280
58342.31 16.32± 0.03-M31-004247.30 in filter V on MJD  58342.310
-------- 15.55± 0.04-M31-004247.30 in filter I on MJD  58342.310
M31-004247.30 in filter I on MJD  58342.310
58366.16 16.38± 0.05-M31-004247.30 in filter V on MJD  58366.160
17.03± 0.04-M31-004247.30 in filter B on MJD  58366.160
--------
58372.15 16.37± 0.03-M31-004247.30 in filter V on MJD  58372.150
-------- 15.61± 0.04-M31-004247.30 in filter I on MJD  58372.150
58433.11 16.49± 0.05-M31-004247.30 in filter V on MJD  58433.110
17.19± 0.05-M31-004247.30 in filter B on MJD  58433.110
--------
58671.33 16.36± 0.05-M31-004247.30 in filter V on MJD  58671.330
16.99± 0.05-M31-004247.30 in filter B on MJD  58671.330
--------
58696.25 16.34± 0.05-M31-004247.30 in filter V on MJD  58696.250
16.93± 0.05-M31-004247.30 in filter B on MJD  58696.250
15.90± 0.04-M31-004247.30 in filter R on MJD  58696.250
15.54± 0.03-M31-004247.30 in filter I on MJD  58696.250
58757.10 16.37± 0.04-M31-004247.30 in filter V on MJD  58757.100
---- 15.98± 0.03-M31-004247.30 in filter R on MJD  58757.100
----
58784.07 16.43± 0.04-M31-004247.30 in filter V on MJD  58784.070
17.10± 0.04-M31-004247.30 in filter B on MJD  58784.070
--------
58812.12 16.42± 0.04-M31-004247.30 in filter V on MJD  58812.120
-------- 15.64± 0.03-M31-004247.30 in filter I on MJD  58812.120
59019.35 16.45± 0.03-M31-004247.30 in filter V on MJD  59019.350
17.15± 0.04-M31-004247.30 in filter B on MJD  59019.350
--------
59077.17 16.34± 0.05-M31-004247.30 in filter V on MJD  59077.170
-------- 15.60± 0.03-M31-004247.30 in filter I on MJD  59077.170
59082.22 16.36± 0.04-M31-004247.30 in filter V on MJD  59082.220
16.98± 0.04-M31-004247.30 in filter B on MJD  59082.220
--------
59136.09 16.37± 0.04-M31-004247.30 in filter V on MJD  59136.090
17.00± 0.04-M31-004247.30 in filter B on MJD  59136.090
15.98± 0.03-M31-004247.30 in filter R on MJD  59136.090
----
59166.10 16.37± 0.03-M31-004247.30 in filter V on MJD  59166.100
-------- 15.61± 0.04-M31-004247.30 in filter I on MJD  59166.100
59379.36 16.49± 0.05-M31-004247.30 in filter V on MJD  59379.360
---- 16.07± 0.04-M31-004247.30 in filter R on MJD  59379.360
----
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 M31-004247.30Plot of color for M31-004247.30

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 [0.34 mag]B [0.30 mag]R [0.17 mag]
B [0.34 mag]0.93 (17)
R [0.17 mag]0.73 (13)0.68 (7)
I [0.10 mag]0.69 (13)1.00 (3)0.94 (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 M31-004247.30

Plot to assess correlation between bands for M31-004247.30

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)
2.90 | 1.51
R
(I|R)
1.22 | 0.851.84 | 0.03
I
(I|R)
0.72 | 0.95--- | --- 1.57 | 1.00

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

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