Color composite thumbnail image of M31-003910.85M31-003910.85 (J003910.85+403622.4)



Target Notes

Color composite thumbnail image of M31-003910.85

Classification: Fe_emission

(Candidate 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
57743.02 18.14± 0.04-M31-003910.85 in filter V on MJD  57743.020
18.55± 0.04-M31-003910.85 in filter B on MJD  57743.020
17.80± 0.03-M31-003910.85 in filter R on MJD  57743.020
17.60± 0.05-M31-003910.85 in filter I on MJD  57743.020
57964.26 18.28± 0.05-M31-003910.85 in filter V on MJD  57964.260
---- 17.88± 0.04-M31-003910.85 in filter R on MJD  57964.260
----
57988.31 18.30± 0.04-M31-003910.85 in filter V on MJD  57988.310
18.58± 0.05-M31-003910.85 in filter B on MJD  57988.310
---- 17.60± 0.05-M31-003910.85 in filter I on MJD  57988.310
58073.12 18.23± 0.04-M31-003910.85 in filter V on MJD  58073.120
18.58± 0.06-M31-003910.85 in filter B on MJD  58073.120
--------
58098.18 18.34± 0.03-M31-003910.85 in filter V on MJD  58098.180
-------- 17.66± 0.05-M31-003910.85 in filter I on MJD  58098.180
58316.32 18.20± 0.05-M31-003910.85 in filter V on MJD  58316.320
18.55± 0.05-M31-003910.85 in filter B on MJD  58316.320
17.84± 0.04-M31-003910.85 in filter R on MJD  58316.320
----
58372.17 18.20± 0.04-M31-003910.85 in filter V on MJD  58372.170
-------- 17.61± 0.07-M31-003910.85 in filter I on MJD  58372.170
58403.14 18.38± 0.05-M31-003910.85 in filter V on MJD  58403.140
18.60± 0.05-M31-003910.85 in filter B on MJD  58403.140
--------
58433.06 18.48± 0.04-M31-003910.85 in filter V on MJD  58433.060
18.87± 0.05-M31-003910.85 in filter B on MJD  58433.060
18.13± 0.04-M31-003910.85 in filter R on MJD  58433.060
----
58672.29 18.27± 0.05-M31-003910.85 in filter V on MJD  58672.290
18.48± 0.06-M31-003910.85 in filter B on MJD  58672.290
--------
58695.24 18.36± 0.04-M31-003910.85 in filter V on MJD  58695.240
---- 17.95± 0.04-M31-003910.85 in filter R on MJD  58695.240
17.73± 0.05-M31-003910.85 in filter I on MJD  58695.240
59019.39 18.22± 0.06TM31-003910.85 in filter V on MJD  59019.390
> 18.85-M31-003910.85 in filter B on MJD  59019.390
--------
59059.26 18.26± 0.03-M31-003910.85 in filter V on MJD  59059.260
18.53± 0.04-M31-003910.85 in filter B on MJD  59059.260
17.87± 0.04-M31-003910.85 in filter R on MJD  59059.260
----
59081.20 18.18± 0.05-M31-003910.85 in filter V on MJD  59081.200
-------- 17.52± 0.07-M31-003910.85 in filter I on MJD  59081.200
59131.16 18.26± 0.06-M31-003910.85 in filter V on MJD  59131.160
18.55± 0.06-M31-003910.85 in filter B on MJD  59131.160
--------
59166.23 18.26± 0.03-M31-003910.85 in filter V on MJD  59166.230
-------- 17.60± 0.07-M31-003910.85 in filter I on MJD  59166.230
59194.18 18.22± 0.05-M31-003910.85 in filter V on MJD  59194.180
---- 17.84± 0.04-M31-003910.85 in filter R on MJD  59194.180
----
59380.38 18.20± 0.07-M31-003910.85 in filter V on MJD  59380.380
---- 17.81± 0.06-M31-003910.85 in filter R on MJD  59380.380
----
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 M31-003910.85Plot of color for M31-003910.85

Key for Plot Variability Photometry Table Target Notes


Variability

Plot/Graph Photometry Table Target Notes

From the data available in this survey, it is not possible to tell with certainty if 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 [0.39 mag]B [0.34 mag]R [0.33 mag]
B [0.39 mag]0.60 (9)
R [0.33 mag]0.95 (8)0.94 (4)
I [0.21 mag]0.56 (7)-.-- (2) -.-- (2)

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 M31-003910.85

Plot to assess correlation between bands for M31-003910.85

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)
4.23 | 0.83
R
(I|R)
6.55 | 0.94--- | ---
I
(I|R)
1.67 | 1.88--- | --- --- | ----

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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