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. YY MEN, HD 32918 in Obsid 2557 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. YY MEN, HD 32918 in Obsid 2557 is circled in red on the plot.

Hardness Ratios for YY MEN, HD 32918, Obsid 2557
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.119	0.227	0.111
ACIS-I	-0.069	0.463	0.406

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 YY MEN, HD 32918, Obsid 2557

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.898 0.005 1.190 0.000 1.716 0.005

Q-norm 0.078 0.001 0.116 0.000 0.184 0.001
ACIS-I keV 1.015 0.004 1.321 0.007 1.832 0.007

Q-norm 0.093 0.001 0.133 0.001 0.199 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 YY MEN, HD 32918, Obsid 2557
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.898	0.005	1.190	0.000	1.716	0.005
ACIS-S	Q-norm	0.078	0.001	0.116	0.000	0.184	0.001
ACIS-I	keV	1.015	0.004	1.321	0.007	1.832	0.007
ACIS-I	Q-norm	0.093	0.001	0.133	0.001	0.199	0.001