Color composite thumbnail image of Var AVar A (J013232.86+303025.2 )



Target Notes

Color composite thumbnail image of Var_A

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 M33 Variability Hartman et al. Survey (2006) at VizieR


Photometry Table

Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability
MJDV*ImageB*ImageR*ImagesI*Images
56599.22 18.23± 0.07-Var_A in filter V on MJD  56599.220
18.92± 0.07-Var_A in filter B on MJD  56599.220
17.72± 0.05-Var_A in filter R on MJD  56599.220
----
57035.14 18.41± 0.07-Var_A in filter V on MJD  57035.140
> 17.97-Var_A in filter B on MJD  57035.140
17.85± 0.06-Var_A in filter R on MJD  57035.140
----
57310.16 18.38± 0.07-Var_A in filter V on MJD  57310.160
18.87± 0.07-Var_A in filter B on MJD  57310.160
17.83± 0.06-Var_A in filter R on MJD  57310.160
----
57638.39 18.47± 0.04-Var_A in filter V on MJD  57638.390
19.10± 0.06-Var_A in filter B on MJD  57638.390
17.97± 0.04-Var_A in filter R on MJD  57638.390
17.58± 0.07-Var_A in filter I on MJD  57638.390
57964.40 18.48± 0.04-Var_A in filter V on MJD  57964.400
-------- 17.40± 0.08AVar_A in filter I on MJD  57964.400
Var_A in filter I on MJD  57964.400
58043.13 18.41± 0.05-Var_A in filter V on MJD  58043.130
19.03± 0.06-Var_A in filter B on MJD  58043.130
17.82± 0.04-Var_A in filter R on MJD  58043.130
----
58073.22 18.42± 0.05-Var_A in filter V on MJD  58073.220
19.09± 0.07-Var_A in filter B on MJD  58073.220
--------
58108.09 18.52± 0.04-Var_A in filter V on MJD  58108.090
19.23± 0.06-Var_A in filter B on MJD  58108.090
---- 17.38± 0.07-Var_A in filter I on MJD  58108.090
58316.35 18.26± 0.07-Var_A in filter V on MJD  58316.350
19.04± 0.07-Var_A in filter B on MJD  58316.350
--------
58341.37 18.40± 0.05-Var_A in filter V on MJD  58341.370
-------- 17.29± 0.08-Var_A in filter I on MJD  58341.370
58373.15 18.40± 0.08-Var_A in filter V on MJD  58373.150
19.09± 0.10-Var_A in filter B on MJD  58373.150
--------
58433.02 18.27± 0.06-Var_A in filter V on MJD  58433.020
---- 17.74± 0.05-Var_A in filter R on MJD  58433.020
17.27± 0.09-Var_A in filter I on MJD  58433.020
58695.39 18.37± 0.05-Var_A in filter V on MJD  58695.390
---- 17.80± 0.04-Var_A in filter R on MJD  58695.390
----
58750.22 18.40± 0.05-Var_A in filter V on MJD  58750.220
19.10± 0.05-Var_A in filter B on MJD  58750.220
---- 17.33± 0.08-Var_A in filter I on MJD  58750.220
58784.14 18.48± 0.05-Var_A in filter V on MJD  58784.140
---- 17.90± 0.05-Var_A in filter R on MJD  58784.140
----
58812.20 18.36± 0.06-Var_A in filter V on MJD  58812.200
---- 17.77± 0.07-Var_A in filter R on MJD  58812.200
----
59059.40 18.28± 0.06-Var_A in filter V on MJD  59059.400
---- 17.74± 0.05-Var_A in filter R on MJD  59059.400
17.27± 0.09-Var_A in filter I on MJD  59059.400
59081.30 18.31± 0.06-Var_A in filter V on MJD  59081.300
19.02± 0.06-Var_A in filter B on MJD  59081.300
17.73± 0.05-Var_A in filter R on MJD  59081.300
----
59082.38 18.35± 0.06-Var_A in filter V on MJD  59082.380
19.09± 0.04-Var_A in filter B on MJD  59082.380
Var_A in filter B on MJD  59082.380
17.78± 0.04-Var_A in filter R on MJD  59082.380
Var_A in filter R on MJD  59082.380
----
59084.25-------- 17.76± 0.04TVar_A in filter R on MJD  59084.250
----
59161.14 18.34± 0.05-Var_A in filter V on MJD  59161.140
---- 17.82± 0.05-Var_A in filter R on MJD  59161.140
17.35± 0.09-Var_A in filter I on MJD  59161.140
59171.14 18.47± 0.07-Var_A in filter V on MJD  59171.140
19.10± 0.05-Var_A in filter B on MJD  59171.140
---- 17.33± 0.07-Var_A in filter I on MJD  59171.140
59227.12 18.46± 0.05-Var_A in filter V on MJD  59227.120
19.11± 0.05-Var_A in filter B on MJD  59227.120
17.87± 0.05-Var_A in filter R on MJD  59227.120
----
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_APlot of color for Var_A

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 [0.36 mag]B [0.29 mag]R [0.24 mag]
B [0.36 mag]0.47 (13)
R [0.24 mag]0.83 (14)0.20 (7)
I [0.31 mag]0.38 (9)0.01 (4)0.99 (4)

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_A

Plot to assess correlation between bands for Var_A

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)
1.39 | 0.85
R
(I|R)
2.00 | 0.932.77 | 0.04
I
(I|R)
1.26 | 1.63--- | --- --- | ----

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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