Color composite thumbnail image of GR 290GR 290 (J013509.73+304157.3)



Target Notes

Color composite thumbnail image of GR_290

Classification: Of/late-WN

(Candidate LBV) Romano's Star. No blend concerns. Cosmic ray interferes with V on 57634.81.

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
56140.37 18.54± 0.07-GR_290 in filter V on MJD  56140.370
---- 18.47± 0.26-GR_290 in filter R on MJD  56140.370
----
56976.16 18.69± 0.05-GR_290 in filter V on MJD  56976.160
18.48± 0.07-GR_290 in filter B on MJD  56976.160
18.50± 0.06-GR_290 in filter R on MJD  56976.160
----
57038.13 18.76± 0.05-GR_290 in filter V on MJD  57038.130
18.53± 0.06-GR_290 in filter B on MJD  57038.130
18.62± 0.05-GR_290 in filter R on MJD  57038.130
----
57310.13 18.80± 0.09-GR_290 in filter V on MJD  57310.130
18.59± 0.09-GR_290 in filter B on MJD  57310.130
18.70± 0.08-GR_290 in filter R on MJD  57310.130
----
57335.18 18.75± 0.07-GR_290 in filter V on MJD  57335.180
---- 18.59± 0.06-GR_290 in filter R on MJD  57335.180
----
57401.10 18.82± 0.07-GR_290 in filter V on MJD  57401.100
18.55± 0.06-GR_290 in filter B on MJD  57401.100
--------
57634.34 18.81± 0.10bGR_290 in filter V on MJD  57634.340
18.54± 0.08-GR_290 in filter B on MJD  57634.340
18.61± 0.06-GR_290 in filter R on MJD  57634.340
18.88± 0.10-GR_290 in filter I on MJD  57634.340
57687.13 18.78± 0.07-GR_290 in filter V on MJD  57687.130
18.71± 0.08-GR_290 in filter B on MJD  57687.130
18.61± 0.07-GR_290 in filter R on MJD  57687.130
18.43± 0.11-GR_290 in filter I on MJD  57687.130
57964.37 19.00± 0.06-GR_290 in filter V on MJD  57964.370
18.81± 0.06-GR_290 in filter B on MJD  57964.370
18.80± 0.06-GR_290 in filter R on MJD  57964.370
18.68± 0.10-GR_290 in filter I on MJD  57964.370
58045.15 18.74± 0.07-GR_290 in filter V on MJD  58045.150
18.60± 0.08-GR_290 in filter B on MJD  58045.150
18.49± 0.07-GR_290 in filter R on MJD  58045.150
----
58073.18 18.88± 0.06-GR_290 in filter V on MJD  58073.180
18.73± 0.07-GR_290 in filter B on MJD  58073.180
--------
58103.14 18.83± 0.06-GR_290 in filter V on MJD  58103.140
-------- 18.38± 0.12-GR_290 in filter I on MJD  58103.140
58316.38 18.83± 0.05-GR_290 in filter V on MJD  58316.380
18.73± 0.07-GR_290 in filter B on MJD  58316.380
18.76± 0.06-GR_290 in filter R on MJD  58316.380
19.11± 0.14-GR_290 in filter I on MJD  58316.380
58342.36 18.92± 0.07-GR_290 in filter V on MJD  58342.360
18.62± 0.08-GR_290 in filter B on MJD  58342.360
18.87± 0.07-GR_290 in filter R on MJD  58342.360
18.70± 0.12-GR_290 in filter I on MJD  58342.360
58420.06 18.78± 0.07-GR_290 in filter V on MJD  58420.060
18.63± 0.08-GR_290 in filter B on MJD  58420.060
18.72± 0.08-GR_290 in filter R on MJD  58420.060
> 18.36-GR_290 in filter I on MJD  58420.060
58433.00 18.88± 0.12-GR_290 in filter V on MJD  58433.000
---- 18.59± 0.08-GR_290 in filter R on MJD  58433.000
> 18.32-GR_290 in filter I on MJD  58433.000
58672.39 18.89± 0.13-GR_290 in filter V on MJD  58672.390
---- 18.70± 0.09-GR_290 in filter R on MJD  58672.390
> 18.05-GR_290 in filter I on MJD  58672.390
58695.36 18.80± 0.06-GR_290 in filter V on MJD  58695.360
18.64± 0.06-GR_290 in filter B on MJD  58695.360
18.72± 0.05-GR_290 in filter R on MJD  58695.360
----
58784.12 18.82± 0.06-GR_290 in filter V on MJD  58784.120
18.59± 0.06-GR_290 in filter B on MJD  58784.120
--------
58812.22 18.70± 0.06-GR_290 in filter V on MJD  58812.220
-------- 19.03± 0.11-GR_290 in filter I on MJD  58812.220
58902.07 18.85± 0.06-GR_290 in filter V on MJD  58902.070
---- 18.65± 0.06-GR_290 in filter R on MJD  58902.070
----
59059.38 18.87± 0.06-GR_290 in filter V on MJD  59059.380
18.69± 0.06-GR_290 in filter B on MJD  59059.380
--------
59081.30 18.92± 0.06AGR_290 in filter V on MJD  59081.300
GR_290 in filter V on MJD  59081.300
18.69± 0.07-GR_290 in filter B on MJD  59081.300
18.70± 0.05AGR_290 in filter R on MJD  59081.300
GR_290 in filter R on MJD  59081.300
----
59084.34-------- 18.69± 0.04TGR_290 in filter R on MJD  59084.340
----
59161.07 18.83± 0.07-GR_290 in filter V on MJD  59161.070
18.58± 0.07-GR_290 in filter B on MJD  59161.070
18.70± 0.06-GR_290 in filter R on MJD  59161.070
----
59171.09 18.84± 0.06-GR_290 in filter V on MJD  59171.090
-------- 18.40± 0.09-GR_290 in filter I on MJD  59171.090
59227.08 18.68± 0.04-GR_290 in filter V on MJD  59227.080
18.55± 0.05-GR_290 in filter B on MJD  59227.080
18.56± 0.05-GR_290 in filter R on MJD  59227.080
----
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 GR_290Plot of color for GR_290

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 [0.32 mag]B [0.46 mag]R [0.40 mag]
B [0.32 mag]0.51 (18)
R [0.40 mag]0.62 (19)0.35 (14)
I [0.73 mag]0.06 (8)0.03 (5)0.03 (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 GR_290

Plot to assess correlation between bands for GR_290

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 | 1.05
R
(I|R)
1.74 | 0.891.57 | 0.65
I
(I|R)
-0.95 | 0.48-0.62 | 0.690.64 | 0.97

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