Color composite thumbnail image of M31-004621.08M31-004621.08 (J004621.08+421308.2)



Target Notes

Color composite thumbnail image of M31-004621.08

Classification: Warm-Hypergiant

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
56952.12 18.00± 0.05-M31-004621.08 in filter V on MJD  56952.120
18.29± 0.06-M31-004621.08 in filter B on MJD  56952.120
17.63± 0.06-M31-004621.08 in filter R on MJD  56952.120
----
56976.13 18.08± 0.06-M31-004621.08 in filter V on MJD  56976.130
18.34± 0.04-M31-004621.08 in filter B on MJD  56976.130
17.68± 0.06-M31-004621.08 in filter R on MJD  56976.130
----
57309.17 18.16± 0.04-M31-004621.08 in filter V on MJD  57309.170
18.37± 0.03-M31-004621.08 in filter B on MJD  57309.170
17.67± 0.03-M31-004621.08 in filter R on MJD  57309.170
----
57633.41 18.07± 0.05-M31-004621.08 in filter V on MJD  57633.410
18.31± 0.03-M31-004621.08 in filter B on MJD  57633.410
17.62± 0.03-M31-004621.08 in filter R on MJD  57633.410
----
57638.31 17.95± 0.08-M31-004621.08 in filter V on MJD  57638.310
-------- 17.18± 0.09-M31-004621.08 in filter I on MJD  57638.310
57964.30 17.99± 0.05-M31-004621.08 in filter V on MJD  57964.300
18.26± 0.05-M31-004621.08 in filter B on MJD  57964.300
17.59± 0.06-M31-004621.08 in filter R on MJD  57964.300
17.48± 0.06-M31-004621.08 in filter I on MJD  57964.300
57988.38 18.02± 0.06-M31-004621.08 in filter V on MJD  57988.380
---- 17.57± 0.07-M31-004621.08 in filter R on MJD  57988.380
17.22± 0.09-M31-004621.08 in filter I on MJD  57988.380
58073.16 18.05± 0.06-M31-004621.08 in filter V on MJD  58073.160
18.35± 0.05-M31-004621.08 in filter B on MJD  58073.160
--------
58317.34 18.24± 0.06-M31-004621.08 in filter V on MJD  58317.340
18.51± 0.04-M31-004621.08 in filter B on MJD  58317.340
--------
58339.37 17.99± 0.08-M31-004621.08 in filter V on MJD  58339.370
---- 17.54± 0.07-M31-004621.08 in filter R on MJD  58339.370
17.31± 0.08-M31-004621.08 in filter I on MJD  58339.370
58342.33 17.96± 0.04-M31-004621.08 in filter V on MJD  58342.330
18.25± 0.03-M31-004621.08 in filter B on MJD  58342.330
--------
58673.36 18.09± 0.03-M31-004621.08 in filter V on MJD  58673.360
18.39± 0.04-M31-004621.08 in filter B on MJD  58673.360
--------
58696.35 18.00± 0.03-M31-004621.08 in filter V on MJD  58696.350
---- 17.50± 0.03-M31-004621.08 in filter R on MJD  58696.350
17.21± 0.04-M31-004621.08 in filter I on MJD  58696.350
58757.14 17.99± 0.03-M31-004621.08 in filter V on MJD  58757.140
---- 17.53± 0.03-M31-004621.08 in filter R on MJD  58757.140
----
58812.18 17.93± 0.03-M31-004621.08 in filter V on MJD  58812.180
-------- 17.19± 0.04-M31-004621.08 in filter I on MJD  58812.180
59056.36 18.06± 0.03-M31-004621.08 in filter V on MJD  59056.360
---- 17.57± 0.02-M31-004621.08 in filter R on MJD  59056.360
----
59059.35 18.00± 0.03-M31-004621.08 in filter V on MJD  59059.350
18.34± 0.03-M31-004621.08 in filter B on MJD  59059.350
--------
59081.24 17.99± 0.03-M31-004621.08 in filter V on MJD  59081.240
-------- 17.23± 0.04-M31-004621.08 in filter I on MJD  59081.240
59136.14 17.97± 0.03-M31-004621.08 in filter V on MJD  59136.140
18.26± 0.03-M31-004621.08 in filter B on MJD  59136.140
17.58± 0.03-M31-004621.08 in filter R on MJD  59136.140
17.32± 0.04-M31-004621.08 in filter I on MJD  59136.140
59382.38 17.97± 0.10-M31-004621.08 in filter V on MJD  59382.380
---- 17.58± 0.09-M31-004621.08 in filter R on MJD  59382.380
----
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 M31-004621.08Plot of color for M31-004621.08

Key for Plot Variability Photometry Table Target Notes


Variability

Plot/Graph Photometry Table Target Notes

It is 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 [0.26 mag]B [0.31 mag]R [0.18 mag]
B [0.26 mag]0.83 (11)
R [0.18 mag]0.44 (12)0.89 (6)
I [0.30 mag]0.07 (8)-.-- (2) 0.41 (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 M31-004621.08

Plot to assess correlation between bands for M31-004621.08

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)
3.14 | 0.88
R
(I|R)
1.58 | 0.930.83 | 0.05
I
(I|R)
0.20 | 0.50--- | --- 1.52 | 0.60

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