X-ray Hardness and Quantiles

Hardness ratios calculated from the predicted ACIS-S Aimpoint spectra of selected X-Atlas targets (× = hot star; ◊ = cool star). S, M, and H are the total predicted counts in the passbands listed on the plot. OU And in Obsid 1892 is circled in red on the plot.

Hardness ratios calculated from the predicted ACIS-I Aimpoint spectra of selected X-Atlas targets (× = hot star; ◊ = cool star). S, M, and H are the total predicted counts in the passbands listed on the plot. OU And in Obsid 1892 is circled in red on the plot.

Hardness Ratios for OU And, Obsid 1892
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.118	0.256	0.142
ACIS-I	-0.061	0.470	0.422

X-ray Quantiles

Quantile-based color-color diagram: (m = Q₅₀ = (E₅₀ - E_lo)/(E_hi - E_lo)). E_lo = 0.3 keV; E_hi = 8.0 keV

View complete listing of X-Atlas Spectral Metrics (Hardness, Quantiles).

Quantiles for OU And, Obsid 1892

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.913 0.003 1.190 0.001 1.745 0.006

Q-norm 0.080 0.000 0.116 0.000 0.188 0.001
ACIS-I keV 1.015 0.004 1.321 0.006 1.876 0.007

Q-norm 0.093 0.001 0.133 0.001 0.205 0.001

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ACIS-S hot stars JPG Postscript	ACIS-S cool stars JPG Postscript
ACIS-I hot stars JPG Postscript	ACIS-I cool stars JPG Postscript

Quantiles for OU And, Obsid 1892
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.913	0.003	1.190	0.001	1.745	0.006
ACIS-S	Q-norm	0.080	0.000	0.116	0.000	0.188	0.001
ACIS-I	keV	1.015	0.004	1.321	0.006	1.876	0.007
ACIS-I	Q-norm	0.093	0.001	0.133	0.001	0.205	0.001