View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
5400	2005-09-05 14:49:56	HD 93250	HD 93250	Star in Cluster	O3.5V((f+))	0.1650	161.187450	-59.565200	33727.40

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
1076	0.0319	mild

The zeroth-order image for HD 93250

Hardness Ratios and Quantiles

Hardness ratios and quantiles are calculated from the predicted ACIS-S or ACIS-I aimpoint spectra, as indicated.

Hardness Ratios
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.201	0.183	-0.019
ACIS-I	-0.151	0.421	0.289

S, M, and H represent the predicted total counts in the following passbands:

S: 0.3-0.9 keV

M: 0.9-1.5 keV

H: 1.5-8.0 keV

Quantiles
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.854	0.007	1.117	0.009	1.599	0.018
ACIS-S	Q-norm	0.072	0.001	0.106	0.001	0.169	0.002
ACIS-I	keV	0.971	0.007	1.263	0.010	1.745	0.018
ACIS-I	Q-norm	0.087	0.001	0.125	0.001	0.188	0.002

Normalized quantiles (Q-norm) are defined as:

Q_x = (E_x - E_lo)/(E_hi - E_lo)

Where E_lo = 0.3 keV and E_hi = 8.0 keV.

Hardness Ratio plots and Quantile-based Color-Color Diagrams

X-Atlas Hardness Ratios and Quantiles Listing

Spectral Metrics

A series of line-line, line-continuum, and continuum-continuum ratios calculated from the high-resolution 1^st order MEG or LEG spectrum.

Line-Line Ratios
Ne X / O VIII	Ne2O Error	O VII(i) / O VII(f)	Oif Error	O VII(r) / O VIII	O78 Error	O VIII / Fe XVII	O8Fe Error	Mg XII / Fe XVII	Mg2Fe Error	Si XIV / Fe XVII	Si2Fe Error	S XV / Fe XVII	S2Fe Error
6.6791	20.5614	0.0000	0.0000	0.0000	0.0000	0.0873	0.2533	0.9424	1.2839	0.3808	0.5722	0.3622	1.0737

short line / cont

Line-Continuum & Continuum-Continuum Ratios
sl2c Error	long line / cont	ll2c Error	line / cont	l2c Error	cont long / cont short	cl2cs Error	cont long / cont med	cl2cm Error	cont med / cont short	cm2cs Error
0.4037	0.1108	0.0485	1.0813	0.4574	1.0870	0.3427	0.0100	0.4992	0.0202	2.1888	0.0888

X-Atlas Spectral Metrics Listing

Spectral Fits

Image File Missing: 2T xsmekal zeroth-order fit
Mewe-Kaastra-Liedahl 2-temperature fit of the low-resolution zeroth-order spectrum of HD 93250.
Warning: The zeroth-order spectrum may be subject to distortions from pileup.

Image File Missing: 2T xsmekal ACIS-S fit
Mewe-Kaastra-Liedahl 2-temperature fit of the predicted low-resolution ACIS-S Aimpoint spectrum of HD 93250. The predicted spectrum was scaled to 1500 counts.

Image File Missing: 2T xsmekal ACIS-I fit
Mewe-Kaastra-Liedahl 2-temperature fit of the predicted low-resolution ACIS-I Aimpoint spectrum of HD 93250. The predicted spectrum was scaled to 1500 counts.

Aimpoint	Model	nH (10²²/cm³)	nH error	kT (keV)	kT error	kT2 (keV)	kT2 error	Abundance (solar)	Abundance error	Flux (ergs/cm²/s)	Flux Emission Ratio (kT2/kT1)	Reduced Chi²	DoF
zeroth-order	xswabs*(xsmekal1+xsmekal2)	0.019		2.058		0.010		0.26		0	0	2.99	48
ACIS-S	xswabs*(xsmekal1+xsmekal2)	0.295		2.934		0.960		0.06		1.98333e-13	4.00438	2.55	73
ACIS-I	xswabs*(xsmekal1+xsmekal2)	0.295		3.359		1.037		0.24		2.77617e-13	1.90171	1.87	71

X-Atlas Spectral Fits Listing

HETG Light Curve

GLvary
Odds	-1.722
Prob.	0.019
Var. Index	0

HETG light curve for HD 93250, constructed from all ±1^st, ±2^nd, and ±3^rd order HETG events.

HETG HEG Spectrum

Image File Missing: High-Resolution 1st Order HEG spectrum of obsid 5400

High-Resolution 1st Order HEG Spectrum for HD 93250

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 5400

High-Resolution 1st Order MEG Spectrum for HD 93250

X-Atlas Data Products

Spectral Data
PHA II	HEG ±1^st Order PHA	HEG ±1^st Order gARF	MEG ±1^st Order PHA	MEG ±1^st Order gARF	[Counts/s/Å] FITS	[Counts/s/Å] text	[ph/s/Å/cm²] FITS	[ph/s/Å/cm²] text

Standard Data Products (Cycle 06)
Aimpoint ARF		Aimpoint RMF
ACIS-S	ACIS-I	ACIS-S	ACIS-I

Retrieve observation data from the Chandra Data Archive: WebChaSeR

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